CN118249964A

CN118249964A - Alternative HARQ configuration for XR uplink data transmission

Info

Publication number: CN118249964A
Application number: CN202311789751.1A
Authority: CN
Inventors: A·阿米里; K·I·佩德森; 李泽宪; S·帕里斯
Original assignee: Nokia Technologies Oy
Current assignee: Nokia Technologies Oy
Priority date: 2022-12-23
Filing date: 2023-12-25
Publication date: 2024-06-25

Abstract

The application is entitled "alternative HARQ configuration for XR uplink data transmission". An apparatus configured to: signaling to a user equipment for scheduling retransmission of at least one transport block in an uplink transport beam, comprising at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of an MCS for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with at least one transport block.

Description

Alternative HARQ configuration for XR uplink data transmission

Technical Field

The exemplary and non-limiting embodiments relate generally to retransmission of data packets and, more particularly, to selective retransmission of data packets.

Background

It is known that in network communication, repeated transmission of transmission time intervals can be achieved.

Disclosure of Invention

The following summary is intended to be illustrative only. This summary is not intended to limit the scope of the claims.

According to one aspect, an apparatus comprises: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: transmitting signaling to the user equipment for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for the retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with at least one transport block; and receiving a retransmission of the at least one transport block from the user equipment.

According to one aspect, a method includes: transmitting signaling to the user equipment for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for the retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with at least one transport block; and receiving a retransmission of the at least one transport block from the user equipment.

According to one aspect, an apparatus comprises means for: transmitting signaling to the user equipment for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for the retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with at least one transport block; and receiving a retransmission of the at least one transport block from the user equipment.

According to one aspect, a non-transitory computer readable medium includes program instructions stored thereon for performing at least the following: causing transmission of signaling to the user equipment for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for the retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with at least one transport block; and causing reception of a retransmission from the at least one transport block of the user equipment.

According to one aspect, an apparatus comprises: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: receiving signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with at least one transport block; and performing uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to one aspect, a method includes: receiving signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with at least one transport block; and performing uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to one aspect, an apparatus comprises means for: receiving signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with at least one transport block; and performing uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to one aspect, a non-transitory computer readable medium includes program instructions stored thereon for performing at least the following: causing reception of signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with at least one transport block; and causing performance of an uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to one aspect, an apparatus comprises: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

According to one aspect, a method includes: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

According to one aspect, an apparatus comprises means for: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

According to one aspect, a non-transitory computer readable medium includes program instructions stored thereon for performing at least the following: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, causing transmission of signaling to the user equipment for scheduling retransmission of at least one of the transport blocks that have been lost.

According to one aspect, an apparatus comprises: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: receiving signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; receiving signaling for scheduling retransmission of at least one of the one or more transport blocks; and performing retransmission of the at least one transport block based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to one aspect, a method includes: receiving signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; receiving signaling for scheduling retransmission of at least one of the one or more transport blocks; and performing retransmission of the at least one transport block based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to one aspect, an apparatus comprises means for: receiving signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; receiving signaling for scheduling retransmission of at least one of the one or more transport blocks; and performing retransmission of the at least one transport block based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to one aspect, a non-transitory computer readable medium includes program instructions stored thereon for performing at least the following: causing reception of signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; causing reception of signaling for scheduling retransmission of at least one of the one or more transport blocks; and causing retransmission of the at least one transport block based at least in part on the signaling for scheduling the retransmission of the at least one transport block.

According to some aspects, the subject matter of the independent claims is provided. Some further aspects are defined in the dependent claims.

Drawings

The foregoing aspects and other features are explained in the following description, taken in connection with the accompanying drawings, wherein:

FIG. 1 is a block diagram of one possible and non-limiting example system in which example embodiments may be practiced;

FIG. 2 is a diagram illustrating features as described herein;

FIG. 3 is a diagram illustrating features as described herein;

FIG. 4 is a diagram illustrating features as described herein;

FIG. 5 is a diagram illustrating features as described herein;

FIG. 6 is a flowchart showing steps as described herein;

FIG. 7 is a flowchart showing steps as described herein;

FIG. 8 is a flowchart showing steps as described herein;

FIG. 9 is a flowchart showing steps as described herein; and

Fig. 10 is a flowchart illustrating steps as described herein.

Detailed Description

The following abbreviations that may occur in the specification and/or the drawings are defined as follows:

3GPP third Generation partnership project

Fifth generation of 5G

5GC 5G core network

6G sixth generation

AMF access and mobility management functions

AR augmented reality

BLER block error rate

BSR buffer status report

CE control element

Authorization of CG configuration

CRAN cloud radio access network

CU central unit

DCI downlink control information

DG dynamic authorization

DL downlink

DU distributed unit

ENBs (or eNodeBs) evolved node Bs (e.g., LTE base stations)

EN-DC E-UTRA-NR double connectivity

En-gNB or En-gNB provides nodes for NR user plane and control plane protocol termination towards the UE and acts as a secondary node in EN-DC

E-UTRA evolved universal terrestrial radio access, i.e. LTE radio access technology

FDD frequency division duplexing

GNB (or gNodeB) for 5G/NR base stations, i.e. nodes providing NR user plane and control plane protocol termination towards the UE, and connected to 5GC via NG interface

HARQ hybrid automatic repeat request

I/F interface

L1 layer 1

LTE long term evolution

MAC medium access control

MCS modulation and coding scheme

MME mobility management entity

MR mixed reality

NG or NG new generation

NG-eNB or NG-eNB new generation eNB

NR new radio

NTN non-land network

N/W or NW network

O-RAN open radio access network

PDB packet delay budget

PDCP packet data convergence protocol

PDSCH physical downlink shared channel

PHY physical layer

PRB physical resource block

PUSCH physical uplink shared channel

QoS quality of service

RAN radio access network

RE resource element

ReTX or RETX retransmission

RF radio frequency

RLC radio link control

RRC radio resource control

RRH remote radio head

RS reference signal

RU radio unit

Rx receiver

SCS subcarrier spacing

SDAP service data adaptation protocol

SGW service gateway

SI system information

SMF session management function

TB transport block

TDD time division duplexing

TTI transmission time interval

Tx transmitter

UCI uplink control information

UE user equipment (e.g., wireless device, typically mobile device)

UL uplink

UPF user plane functionality

VNR virtualized network function

VR virtual reality

XR augmented reality (e.g. AR, MR, VR, etc.)

Turning to fig. 1, a block diagram illustrating one possible and non-limiting example in which an example may be practiced is shown. User Equipment (UE) 110, radio Access Network (RAN) node 170, and network element(s) 190 are shown. In the example of fig. 1, a User Equipment (UE) 110 is in wireless communication with a wireless network 100. A UE is a wireless device that may access the wireless network 100. UE 110 includes one or more processors 120, one or more memories 125, and one or more transceivers 130 interconnected by one or more buses 127. Each of the one or more transceivers 130 includes a receiver Rx 132 and a transmitter Tx 133. The one or more buses 127 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optic or other optical communications devices, etc. "circuitry" may comprise dedicated hardware or hardware associated with software executable thereon. One or more transceivers 130 are connected to one or more antennas 128. The one or more memories 125 include computer program code 123.UE 110 includes a module 140, where module 140 includes one or both of portions 140-1 and/or 140-2, which may be implemented in a variety of ways. The module 140 may be implemented in hardware as a module 140-1, such as being implemented as part of one or more processors 120. The module 140-1 may also be implemented as an integrated circuit or by other hardware, such as a programmable gate array. In another example, module 140 may be implemented as module 140-2, module 140-2 being implemented as computer program code 123 and executed by one or more processors 120. For example, the one or more memories 125 and the computer program code 123 may be configured, with the one or more processors 120, to cause the user device 110 to perform one or more of the operations as described herein. UE 110 communicates with RAN node 170 via wireless link 111.

RAN node 170 in this example is a base station that provides access to wireless network 100 by a wireless device, such as UE 110. RAN node 170 may be, for example, a base station for 5G, also referred to as a New Radio (NR) and/or 5G-advanced (i.e., NR Rel-18 and higher) and/or 6G. In 5G, RAN node 170 may be a NG-RAN node, which is defined as a gNB or NG-eNB. The gNB is a node that provides NR user plane and control plane protocol termination towards the UE and is connected to the 5GC (such as, for example, network element(s) 190) via an NG interface. The NG-eNB is a node providing E-UTRA user plane and control plane protocol termination towards the UE and is connected to the 5GC via an NG interface. The NG-RAN node may include a plurality of gnbs, which may also include a Central Unit (CU) (gNB-CU) 196 and a Distributed Unit (DU) (gNB-DU) or units, where DU 195 is shown. Note that the DU may include or be coupled to and control a Radio Unit (RU). The gNB-CU is a logical node that hosts the RRC, SDAP and PDCP protocols of the gNB or the RRC and PDCP protocols of the en-gNB that control the operation of one or more gNB-DUs. The gNB-CU terminates the F1 interface connected to the gNB-DU. The F1 interface is shown as reference numeral 198, although reference numeral 198 also shows links between remote elements of RAN node 170 and centralized elements of RAN node 170, such as between gNB-CU 196 and gNB-DU 195. The gNB-DU is a logical node that hosts the RLC, MAC and PHY layers of the gNB or en-gNB, and its operation is controlled in part by the gNB-CU. One gNB-CU supports one or more cells. One cell is supported by only one gNB-DU. The gNB-DU terminates the F1 interface 198 connected to the gNB-CU. Note that DU 195 is considered to include transceiver 160, e.g., as part of an RU, but some examples of this may have transceiver 160 as part of a separate RU, e.g., under the control of DU 195 and connected to DU 195.RAN node 170 may also be an eNB (evolved NodeB) base station for LTE (long term evolution), or any other suitable base station, access point, access node, or node.

RAN node 170 includes one or more processors 152, one or more memories 155, one or more network interfaces (N/W I/F) 161, and one or more transceivers 160 interconnected by one or more buses 157. Each of the one or more transceivers 160 includes a receiver Rx 162 and a transmitter Tx 163. One or more transceivers 160 are connected to one or more antennas 158. The one or more memories 155 include computer program code 153.CU 196 may include processor(s) 152, memory 155, and network interface 161. Note that DU 195 may also contain its own memory or memories and processor(s), and/or other hardware, but these are not shown.

RAN node 170 includes a module 150, module 150 including one or both of portions 150-1 and/or 150-2, which may be implemented in a variety of ways. The module 150 may be implemented in hardware as a module 150-1, such as being implemented as part of one or more processors 152. The module 150-1 may also be implemented as an integrated circuit or by other hardware, such as a programmable gate array. In another example, module 150 may be implemented as module 150-2, module 150-2 being implemented as computer program code 153 and executed by one or more processors 152. For example, the one or more memories 155 and the computer program code 153 are configured, with the one or more processors 152, to cause the RAN node 170 to perform one or more of the operations as described herein. Note that the functionality of module 150 may be distributed, such as between DU 195 and CU 196, or implemented in DU 195 alone.

One or more network interfaces 161 communicate over the network, such as via links 176 and 131. Two or more gnbs 170 may communicate using, for example, links 176. Link 176 may be wired or wireless or both, and may implement, for example, an Xn interface for 5G, an X2 interface for LTE, or other suitable interfaces for other standards.

The one or more buses 157 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optic or other optical communication devices, wireless channels, or the like. For example, one or more transceivers 160 may be implemented as a Remote Radio Head (RRH) 195 for LTE or a Distributed Unit (DU) 195 for a 5G gNB implementation, where other elements of RAN node 170 may be physically located in a different location than the RRH/DU, and one or more buses 157 may be implemented in part as, for example, fiber optic cables or other suitable network connections to connect other elements of RAN node 170 (e.g., central Unit (CU), gNB-CU) to RRH/DU 195. Reference numeral 198 also indicates those suitable network link(s).

Note that the description herein indicates that a "cell" performs functions, but it should be clear that the devices forming the cell will perform these functions. The cell forms part of a base station. That is, there may be multiple cells per base station. For example, there may be three cells for a single carrier frequency and associated bandwidth, each covering one third of a 360 degree area, such that the coverage area of a single base station covers an approximately oval or circular shape. Further, each cell may correspond to a single carrier, and the base station may use multiple carriers. Thus, if there are 3 120 degree cells per carrier and two carriers, the base station has a total of 6 cells.

The wireless network 100 may include one or more network elements 190, which may include core network functionality, and which provide connectivity to additional networks, such as a telephone network and/or a data communication network (e.g., the internet), via one or more links 181. Such core network functions for 5G may include access and mobility management function(s) (AMF) and/or User Plane Function (UPF) and/or session management function(s) (SMF). Such core network functions for LTE may include MME (mobility management entity)/SGW (serving gateway) functions. These are merely illustrative functions that may be supported by the network element(s) 190, and note that both 5G and LTE functions may be supported. RAN node 170 is coupled to network element 190 via link 131. Link 131 may be implemented as, for example, an NG interface for 5G, or an S1 interface for LTE, or other suitable interfaces for other standards. The network element 190 includes one or more processors 175, one or more memories 171, and one or more network interfaces (N/WI/F) 180 interconnected by one or more buses 185. The one or more memories 171 include computer program code 173. The one or more memories 171 and the computer program code 173 are configured, with the one or more processors 175, to cause the network element 190 to perform one or more operations.

Wireless network 100 may implement network virtualization, which is a process of combining hardware and software network resources and network functions into a single software-based management entity (virtual network). Network virtualization involves platform virtualization, typically in combination with resource virtualization. Network virtualization is categorized as either external (grouping many networks or portions of networks into one virtual unit) or internal (providing network-like functionality to software containers on a single system). For example, a network may be deployed in a telecommunications cloud, the network having Virtualized Network Functions (VNFs) running on, for example, a data center server. For example, network core functions and/or radio access network(s) (e.g., cloudRAN, O-RAN, edge cloud) may be virtualized. Note that virtualized entities resulting from network virtualization are still implemented to some extent using hardware (such as processors 152 or 175 and memories 155 and 171), and that such virtualized entities also create technical effects.

It may also be noted that the operations of the example embodiments of the present disclosure may be performed by a plurality of cooperating devices (e.g., cRAN).

Computer readable memories 125, 155, and 171 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. The computer readable memories 125, 155, and 171 may be means for performing a memory function. Processors 120, 152, and 175 may be of any type suitable to the local technical environment, and may include, as non-limiting examples, one or more of the following: general purpose computers, special purpose computers, microprocessors, digital Signal Processors (DSPs), and processors based on a multi-core processor architecture. Processors 120, 152, and 175 may be means for performing functions (such as controlling UE 110, RAN node 170), and other functions as described herein.

In general, various example embodiments of user device 110 may include, but are not limited to, cellular telephones such as smartphones, tablet computers, personal Digital Assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, internet appliances permitting wireless internet access and browsing, tablet computers having wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.

Having thus introduced one suitable but non-limiting technical background for the practice of example embodiments of the present disclosure, example embodiments will now be described in more detail.

Features as described herein generally relate to retransmission of lost packets and/or retransmission for selected packets. For example, the groupings may contain gesture and/or haptic data. Referring now to fig. 2, an example of an Uplink (UL) augmented reality (XR) service is shown. According to the UL XR service model agreed in 3GPP Rel-17, gesture and haptic data are sent every 4-5ms (220). The Packet Delay Budget (PDB) for these types of traffic is 10ms. Downlink (DL) traffic, such as 3D video, may be sent every 16.67ms (210) (for the case of 60 frames of video per second).

With a Time Division Duplex (TDD) frame structure "DDDSU" (where D is downlink, U is uplink, and S is a special slot), the UL delay budget (230) can be further reduced to 5ms (a sub-frame of 1-10), since packets are likely to take some time in the UE buffer before transmission. The reliability targets are in the range of 99.9-99.999%. All gesture updates are in the same quality of service (QoS) flow of the same importance when they are generated. However, depending on their relative timing with the incoming DL video frames (e.g., 240, 250, 260, 270), some become less important. Thus, not all gesture updates have the same importance. Typical UL pose update rates should be the same as the minimum DL frame rate; additional transmissions may be used for predictive and/or corrective purposes. 60fps in DL (210) and 250 gestures/second in UL (220), only 1-by-4 gesture updates are needed (e.g., 245, 255, 265, 275) for application-dependent/application. Other gesture updates, such as 235, may become insignificant based on expiration of the PDB (230). The importance of the pose update may be derived from the relative timing of the pose update compared to the most recent DL XR frame (e.g., TDD frame structure constraint (s)).

Example embodiments of the present disclosure are not limited to groupings comprising gesture and/or haptic data; other data may be sent via packets, such as XR data/traffic (e.g., video data, audio data, control data) or non-XR data/traffic. For example, periodic or quasi-periodic data/updates/traffic may be sent via packets according to example embodiments of the present disclosure. Such periodic data may be valid/useful/needed only for a limited time. In this disclosure, the phrases "pose data," "pose update," "pose group," "pose ReTX," "update," "ReTX instance," and "retransmission group" may be used interchangeably. Further, such information items may additionally or alternatively carry other data/information, including but not limited to haptic data and/or other XR data.

XR involves a variety of immersive techniques including, but not limited to, virtual Reality (VR), augmented Reality (AR), and Mixed Reality (MR). Virtual Reality (VR) is a technical field in which video content may be provided (e.g., streamed) to, for example, a VR display system. VR video content can be provided with other VR content (such as audio, haptic, etc. content). The VR display system may be provided with a live or stored feed from a video content source that represents a VR space or world for immersive output through the display system. The virtual space or virtual world is any computer-generated version of space, such as a captured real world space, in which a user may be immersed through a display system (such as a VR headset). VR headphones may be configured to provide VR video and audio content to a user, such as through the use of a pair of video screens and headphones incorporated into or associated with the headphones. The VR headset may be configured to provide feedback, e.g., gesture/haptic data, to the server for the purpose of informing the provision of VR content. Augmented Reality (AR) and Mixed Reality (MR) may be similar to VR in that video content may be provided, as described above, which may overlap or combine with aspects of the real world environment in which AR/MR content is being consumed. Thus, a user of AR content may experience a version of the real-world environment that is "augmented" with additional virtual features (such as virtual visual and/or audio objects). The device may provide AR video and audio content overlaid on a visible, transparent or recorded version of the real world visual and audio elements.

In an example scenario, if any of the gesture/haptic packets sent by the UE are lost, the hybrid automatic repeat request (HARQ) process may attempt to recover it. The gNB may schedule another UL grant for retransmission. The gNB may transmit Downlink Control Information (DCI) to inform the UE of the retransmission. One potential problem may be that the retransmission (ReTx) instance may exceed the PDB, so "lost" data is useless because new gesture/haptic packets will be transmitting/being transmitted at that time. Even if the gNB knows how many PDBs are available for each gesture packet, it may still need to send scheduling DCI in the next available DL slot and schedule UEs for ReTX for packets outside the PDBs. In addition, the UE may always need to listen to DCI for a gesture ReTX; this may cause additional/unnecessary power consumption.

A simple illustration of this scenario is presented in fig. 3, where for illustration purposes we assume 5ms as the periodicity of the gesture update, indicated as Pi, where i=1, 2,3 … … (e.g. 310, 320, 330). The posture packet P1 (310) may be transmitted via the transport block #1 (350) during the TDD radio frame structure (DDDSUDDDSU) (390). Transmissions in the "U" slots of the radio frame structure may need to meet ultra-reliable requirements (i.e., retransmission may not be possible). The first transmission attempt of Transport Block (TB) #2 (360) carrying gesture packet P2 (320) fails and is scheduled for retransmission, e.g., via DCI (370). As shown in fig. 3, for the scenario of PDB (340) with 15KHz subcarrier spacing (SCS) and 10ms, when PDB (340) expires and new pose information P3 (330) has been generated, retransmission of tb#2 (360) is completed/scheduled, disabling previous pose P2 (320). In other words, when a retransmission to tb#2 (360) is scheduled, the actual retransmission of tb#2 (360) may no longer be useful.

One simple solution to avoid late retransmission of packets is to disable HARQ retransmissions, as used in non-terrestrial networks (NTNs). This idea is interesting for NTN, where the round trip time is longer compared to terrestrial networks and retransmissions may far exceed the delay budget (see e.g. 3gpp TS 38.821). Similar solutions are also mentioned in [ R2-2212333], where it is suggested to disable UL retransmission of gesture data for both Dynamic Grants (DG) and Configured Grants (CG). The solution may also be extended to accommodate the maximum number of retransmissions to indicate whether it is the last retransmission at each UL gesture retransmission or whether the current transmission will have no retransmissions.

However, deactivation of retransmissions may cause other problems, such as the inability to guarantee a specific block error rate (BLER) required for gesture/haptic or similar services, or the need for more conservative Modulation and Coding Scheme (MCS) selections (e.g. resulting in reduced spectral efficiency). Furthermore, disabling HARQ retransmissions causes the loss of the benefits that they were designed to provide. In particular, the lost TB cannot recover (i.e., for XR applications, a pose update with a frequency-matched video frame rate is required) and link adaptation schemes that use the loss as an indication of the selection of a more reliable modulation and coding scheme will not work properly.

Another method for increasing the reliability of the first transmission of the gesture packet and preventing late HARQ retransmissions is to use a Transmission Time Interval (TTI) bundle, which is defined in TS 36.321 and TS 36. When the TTI bundle is enabled, the UE performs initial transmission and retransmission with different error detection and correction bits in four consecutive TTIs. In other words, the gNB may schedule the UE to repeat transmissions of the same TTI multiple times. Similarly, in 5G NR, starting from Rel-16, both slot-based Type-a Physical Uplink Shared Channel (PUSCH) repetition and non-slot-based Type-B PUSCH repetition are supported. We observe that this feature cannot be used for all parameter sets and TDD frame structures. In particular, in Rel-17 and Rel-18 3gpp XR SI for XR evaluation and enhancement, parameter set 1 is used (scs=30 kHz) and mini-slots are not considered for performing typical deployments of XR applications.

TTI bundles do not address the problem of transmission loss of UL pose information in a TDD FR1 deployment. In contrast, for those deployments that can support multiple consecutive UL TTIs within a tight XR PDB (e.g., FR2 deployments with scs=120 kHz), TTI bundles can suffer from high overhead due to blind repetition of all posture updates.

As shown in fig. 2, the new gesture update may invalidate the previous gesture transmission. In the example of fig. 3, gesture P3 (330) invalidates P2 (320). However, the use of TTI bundles may cause excessive overhead, since all posture updates have to be repeated four times, assuming that the digital and TDD frame structures support four consecutive TTIs. If we consider the periodicity of 4ms for the pose update and the TDD frame structure "DDDSU" (as indicated in 3GPP XR SI), then one "U" slot per 10ms may be dedicated to the transmission of two pose packets, making the overhead problem worse, since one slot needs to support eight transmissions (i.e., four per pose). It may be noted that in fig. 3, multiple TTIs in a "U" slot may be available, but the posture update frequency may make the use of TTI bundles in TDD less efficient.

In an example embodiment, selective retransmission of lost packets may be enabled. For example, packets from the same QoS flow may be retransmitted. A technical effect of example embodiments of the present disclosure may be to prevent transmission of expired PDB packets. A technical effect of example embodiments of the present disclosure may be to provide reliability for a subset of important (pose) packets using HARQ retransmissions. A technical effect of example embodiments of the present disclosure may be to address late retransmission of UL packets without violating PDB and reliability requirements.

In example embodiments, retransmission configurations may be implemented and/or provided to the UE from the network. In an example embodiment, the TB(s) to be repeated may be known in advance. In an example embodiment, the transmission may be repeated over multiple time-frequency resources. In an example embodiment, additional resources may be reserved for only a subset of UL transmissions. The subset of UL transmissions may take the form of M consecutive TBs, after which additional resources may be pre-allocated. The additional resources may take the form of time-frequency resources that may be used by the network to increase transmission reliability. For example, for each mth PUSCH there may be pre-scheduled additional resources (e.g., separately Configured Grant (CG) PUSCH resources or scheduled with a retransmission configuration, e.g., dynamic Grant (DG) PUSCH resources) for repetition, or more resources in the frequency domain may be pre-scheduled for transmitting TBs using a highly reliable MCS. DG may be signaled via DCI.

The network may pre-configure which UL TB(s) are to be repeated and may also signal whether the repetition should accurately replicate the transport block. The same or different Modulation and Coding Schemes (MCSs), the same or different transport formats (i.e., coding and number of r PHY resources) may be used (e.g., incremental redundancy, where the number of coding and PHY resources used for ReTX is slightly different from the first TX). In an example embodiment, the network may send information about how the original transmission and/or repetition may be performed.

The network may consider the frame/slot/sub-slot structure when configuring rules. For example, in the case where certain UL pose information generated during DL slots/symbols causes longer buffering delay, the UE may be automatically allocated more resources in the next "U" slot of the TDD frame structure to achieve robust transmission. Here, it can be assumed that the network knows the traffic periodicity, which is a reasonable assumption for quasi-periodic traffic (such as UL XR traffic). In all use cases where CG or periodic Buffer Status Report (BSR) plus DG are configured, as in both cases (CG or bsr+dg), the network may need to configure the periodicity of the repeated scheme for TBs according to traffic periodicity. If additional side information about the relative importance of the packet is known, the network may optimize resource utilization by minimizing repetition configured via retransmission configuration. For example, knowledge that only one of the M packets (or bursts or PDU sets) is important and the remaining M-1 packets are derived may be used by the network to reserve additional resources for only one UL packet transmission of M consecutive UL packet transmissions (i.e., retransmission/repetition via/based on retransmission configuration, or to repeatedly allocate more Physical Resource Blocks (PRBs)). A technical effect of a more robust (conservative) transmission may be an increased likelihood of successful TB transmission.

When configuring the resource(s) for retransmission/retransmission, the network may consider at least one of: the user equipment is using a traffic periodicity for an initial transmission of one or more transport blocks, a bundle size of a bundle of uplink transmissions, and/or a corresponding priority/importance level of at least one transport block. For example, if the network congestion is high, the network may determine to allocate resources for the repetition/retransmission of transport blocks with higher priority levels and may determine not to allocate resources for the repetition/retransmission of transport blocks with lower priority levels.

Referring now to fig. 4, an example of a retransmission configuration for allocation of resources for selective retransmission is shown, where the bundle size is four consecutive TBs. The pre-scheduling may be performed for repetition via DG. At 410, the network may send DCI for pre-scheduling resources for ReTX of bundle 1 (420), which may include transport blocks 1,2, 3, and 4, to the UE. The UE may send a resource indication 430 to the network. At 440, the UE may repeat transmission of one or more TBs (e.g., TBx). The index of the bundle size and repeated TB transmissions (i.e., the value of x) may be signaled during RRC configuration or using DCI messages or other radio signaling such as MAC Control Elements (CEs) at 410. At 450, the network may send DCI for ReTX of pre-schedule bundle 2 to the UE (460), which may include transport blocks 5, 6, 7, and 8. The UE may send a resource indication 470 to the network. At 480, the UE may repeat transmission of the one or more TBs according to the indication received by the network through the RRC configuration or DCI message at 450. In the example of fig. 4, this utilizes an "S" indication (TB 1, TB2, TB5, TB7, TB 8) in case the transport block is successfully received; where transport blocks are lost/failed, then the "F" indication (TB 3, TB4, TB 6) is used.

In an example embodiment, the resources for repeated pre-scheduling(s) may be configured via CG. The repetition may be configured on frequency resources. In a first option, if the original UL gesture data is scheduled via the CG, the initial configuration of the CG may add one or more instances for repeated PUSCH transmission(s) (i.e., retransmission (s)). In other words, the initial CG configuration may be different from other CG configurations in that it includes grant(s) for retransmission(s) of one or more packets. Examples of these additions may be configured to occur after bundles of "M" UL gesture PUSCH transmissions. The size of the beam (which may be indicated via new RRC parameters) M may be configured by the network.

In a second option, the separate CG may be configured to carry a schedule of duplicate transmissions. The periodicity of the CG may be M times the periodicity of the original pose data CG. The difference between these two options (single CG configuration versus split CG configuration) is that with split configuration, the gNB can more freely pick different CG parameters, such as MCS for duplicate CGs. For example, a more conservative MCS may be selected for more important gesture updates. One use case may be to reuse a more conservative MCS (e.g., more robust to errors) than the original transmission is sent. For this case, new parameters may be needed to display the links of the two CG configurations so that the UE will know that the same TB will be sent on both CG resources. For example, CG0 may be configured to schedule transmissions of original TBs, and CG1 may be configured to schedule retransmissions/repetitions of TBs in CG 0. The gNB may indicate that CG0 and CG1 are related, and that the TB scheduled for retransmission/repetition in CG1 is actually a repetition of a subset of the TB configured for original transmission in CG 0.

In this disclosure, the terms "retransmission," "repetition," and "repetition instance" may be used interchangeably to refer to a transmission that has been made but may not yet be received at the network, and thus is transmitted at least a second time by the UE.

In a third option, if the original gesture data is scheduled for initial transmission via DG, the duplicate instance may still be scheduled via CG, where the configuration may or may not inherit some configuration (such as MCS) from the corresponding UL DG of the gesture. CG may indicate to UE whether any inheritance should occur and/or what inheritance should occur. The UE may interpret the configuration(s) to be inherited after receipt of the DG based at least in part on the indication in the CG. Similar to the options described above, the periodicity of the retransmissions may be configured as a function of M consecutive DG-based PUSCHs or any other periodicity configured by the gNB that may be considered as the periodicity of traffic, e.g. 5ms for gesture information. For example, the gNB may schedule repetitions based on periodic information of the (initial) gesture data.

Where CG is used in accordance with example embodiments of the present disclosure, the options for TTI bundles may be enabled for the determined CG resource subset.

In another example embodiment, the repetition of the pre-schedule may be configured via DG. In a first option, if the original UL gesture data is scheduled via CG, DG-based pre-scheduling for repetition may be done/provided. The gNB may send scheduling DCI to inform the UE of the TB/(s) HARQ process(s) that should be repeated. Similar to the options described above, a discussion of the decision of the bundle size and MCS selection may also be valid for this example embodiment.

In a second option, if the original gesture data is scheduled via DG, additional DG-based pre-scheduling for repetition may be done. The MCS selection may or may not be inherited from the original gesture data DG.

In an example embodiment, the number of duplicate TBs may be reported in several ways.

For example, the number of TBs selected for repetition may be reported with a bitmap of size M, which may be sent/transmitted in a new field in the scheduling DCI to indicate which gesture PUSCH transmission is to be repeated. For example, for a bundle size of m=4 and configuring the second and last PUSCH repetition, the bitmap may be, for example, 0101. The selection of TBs may be dynamic and may vary from bundle to bundle. Such information may also be carried by existing fields in the DCI.

For example, the number of TBs selected for repetition may be reported with a direct indication, such as a vector of integers of size N in DCI or another message/signaling/indication, where N is the number of TBs that are repeated and each element indicates an index of a TB. For the above example, the indication may be [10,100]. This solution may be advantageous for n=1 (i.e. the case where only one PUSCH is repeated) and a single number is reported. The selection of TBs may be dynamic and may vary from bundle to bundle.

For example, the number of TBs selected for repetition may be reported with a fixed configuration, such as a fixed index, which may be set to a default value for all repetitions. Such indication may be accomplished using an RRC message, for example. This option may be advantageous if the bundle size M and the number N of duplicate TBs and their index are fixed. An example of a proposal might be to repeat only the last TB in the bundle, as it might be the most relevant and up-to-date data for the incoming XR DL traffic. The choice of TB may be fixed between/in the bundles. Alternatively, the HARQ process number may be reported with a fixed configuration.

For example, the number of TBs selected for repetition may be reported using a formula. For example, the UE may update the counter C for each transmitted TB, and may repeat the TB for which the formula mod (C, M) =s holds in the next scheduling opportunity. In this formula, M and S may be integers signaled by the network, e.g. indicating the repetition period and which TB has to be retransmitted/repeated according to the retransmission configuration.

A technical effect of dynamic index selection for duplicate TBs may be the ability to compensate for periodic drift.

In an example embodiment, the beam size M may be configured to be any number. In another example embodiment, the beam size M may be selected based on traffic periodicity in UL (e.g., gesture traffic with periodicity T _pose) and DL (video traffic with periodicity T _DL). For example, the parameter selection due to the relation between UL and DL traffic may be m=ceil (T _pose/T_DL), where Ceil represents the upper limit function. For example, for XR video traffic in DL at 60 frames per second (fps) (T _DL ≡16.67 ms) with UL gesture period of 4ms, then m=4. For example, the parameter selection may be to alternate M to compensate for periodic drift. The technical effect of such parameters may be a non-integer property that better matches the exact ratio of periodicity. For example, for XR video traffic in DL at 60 frames per second (fps) (T _DL ≡16.67 ms) and UL gesture periods of 4ms, a periodic ratio of T _pose/T_DL ≡ 4.167, and an alternating pattern of M=4-4-4-5 may be used to compensate for non-integer parts. To indicate this alternation, two methods may be used. For example, in a semi-static approach, signaling may be performed via RRC such that both the gNB and the UE follow a dynamic bundle starting from the first UL pose PUSCH. This option may be more advantageous for prescheduling accomplished via CG, where the configuration may be fixed over a longer period of time. For example, with a dynamic approach, dynamic indications may be transmitted each time DCI is sent for repeated data. This option may be more advantageous for prescheduling done via DG, where the configuration may change dynamically.

In an example embodiment, where DG is used to schedule the resource(s) for repetition, the UE may be configured such that DG resources immediately following CG resources (assuming CG is used for initial transmission) are always used for retransmission of the last TB carried by CG (i.e., no additional indication is needed in DCI). Alternatively, the gNB may use the HARQ process number in the DCI to inform the UE to retransmit the TB for a specific HARQ process. In an example embodiment, for the CG case (i.e., no DCI), the gNB may reserve more (or twice) frequency resources per M transmissions. In other words, the gNB may allocate frequency resources for retransmission with periodicity of M. Alternatively, the gNB may set two CG configurations, and the decision to switch between CG configurations may be made based on how the number of duplicate TBs may be reported.

A technical effect of example embodiments of the present disclosure may be to increase reliability of transmission of critical gesture updates.

In example embodiments, the triggered configuration may be implemented by the network and/or provided to the UE. In an example embodiment, instead of having a fixed pre-scheduled repetition, the HARQ retransmission may be activated only after N consecutive failures/losses or N failures within a sliding time window. In other words, retransmissions are not scheduled and/or performed unless N failures/losses have occurred; if fewer than N failures/losses have occurred, then the retransmission is not scheduled and/or performed. This approach may be useful compared to the HARQ-less approach, as it may have the technical effect of maintaining reliability of a subset of important UL gesture/haptic data traffic. If the gesture data schedule is carried using CG, the retransmission grant may be a DG-based resource.

Referring now to fig. 5, an example of a trigger configuration for allocation of resources for selective retransmission is shown, where retransmissions may be scheduled after n=4 consecutive TB failures (e.g., a predetermined number of failures). The UE may send TB1 (510), TB2 (520), TB3 (530), TB4 (540), TB5 (550), and TB6 (560) to the gNB. After TB3 (530), TB4 (540), TB5 (550), and TB6 (560) fail, the gNB may send DCI for one or more transport block retransmissions to the UE (570).

It may be noted that although UL traffic has been described as an example in this disclosure for the proposed selective HARQ retransmission scheme, this is not limiting; the concept may also be applied to DL, where for example, HARQ-ACK feedback from the UE may not be needed per DL PDSCH transmission.

In an example embodiment, the activation of the retransmission process may be conditioned on specific conditions depending on the failed UL gesture/haptic packet.

In an example embodiment, a parameter F (which may indicate the number of consecutive failed gesture PUSCH transmissions or the number of failed gesture PUSCH transmissions within a sliding time window (window length may be pre-configured) may be configured at the gNB to trigger a retransmission schedule for one or more failed PUSCH instances. The indication of the index of the requested duplicate TB may be one of the following schemes: the last TB, or the last N TBs. In the last TB scheme, retransmissions may be scheduled only for the last failed TB. This option may be more advantageous if the PDB is very small (< 10 ms) and the retransmission of previously failed TBs may not be useful because their delay budget may have expired. In the N most recent TB schemes, a set of TB indexes may be indicated in scheduling DCI to be retransmitted. This option may be more relevant if the PDB is more relaxed and the failed gesture data can still be recovered. In another example embodiment, each of the N TBs may be scheduled via separate DCIs at the cost of more signaling overhead but with less impact on the current DCI format.

In another example embodiment, a parameter R (which may indicate a ratio of failed gestured PUSCH transmissions) and a parameter W (which may indicate a moving window size to calculate R) may be configured at the gNB to trigger retransmission scheduling for one or more failed PUSCH instances. In other words, scheduling of retransmissions may be triggered in case the ratio of missing TBs to received TBs within a time window is greater than a predetermined threshold. The indication of the index of the requested duplicate TB may be according to one of the above options.

A technical effect of example embodiments of the present disclosure may be to at least partially maintain reliability of gesture information.

In an example embodiment, selective HARQ retransmission in one QoS flow may be performed while considering the relevant traffic flow.

In example embodiments, the gNB and the UE are able to determine the TB to be retransmitted in time (i.e., relative to the PDB) in a very flexible manner.

In an example embodiment, the retransmission configuration may allocate additional duplicate resources to avoid loss of a subset of gesture/haptic packets critical to the incoming DL video stream.

In an example embodiment, the triggered configuration may enable HARQ retransmission only when additional conditions are triggered (e.g., consecutive packet loss). A technical effect of example embodiments of the present disclosure may be to avoid wasting UL resources for expired packets, and to recover some lost packets while possible.

In an example embodiment, the retransmission may be performed only for the selected TB. The unselected TBs cannot be retransmitted.

In an example embodiment, the network may actively signal TB(s) that must be retransmitted within the bundle.

A technical effect of example embodiments of the present disclosure may be to provision a selective retransmission solution that handles the problem of retransmission of delay-sensitive short-life-cycle packets (such as XR gestures and haptic data) later than the packet delay budget.

A technical effect of example embodiments of the present disclosure may be to eliminate latency for ReTX scheduling DCI.

In an example embodiment, a first configuration for scheduling resources for retransmission/repetition may be triggered based on one or more conditions (e.g., the number of losses/failures as described above). If the network is triggered to send the first configuration to the UE based on one or more conditions, the first configuration may include a retransmission configuration for allocation of resources for selective retransmission, after which the network may continue to periodically provide the retransmission configuration(s) without triggering based on one or more conditions. In an example embodiment, the network may monitor for one or more deactivation triggers. For example, the deactivation trigger may be if N successful UL transmissions are performed/received, or are performed/received within a time window. If N successful UL transmissions have not been detected, the gNB may continue to periodically provide retransmission configuration(s) until such deactivation trigger has been met/detected. When the deactivation trigger is detected, the network may cease to periodically provide the retransmission configuration(s) without triggering based on the one or more conditions, and switch to again monitor the one or more conditions.

Referring now to fig. 6, a flow diagram is shown in which a retransmission configuration(s) may be provided to a UE periodically after one or more conditions are initially monitored before the retransmission configuration is sent to the UE until a deactivation trigger is met. At 610, the network may determine whether one or more conditions for providing a retransmission configuration have been met. If not, the network may continue to monitor one or more conditions. If so, the network may provide a retransmission configuration to the UE at 620. At 630, the network may determine whether one or more deactivation conditions have been met. If so, at 640, the network may determine that the retransmission configuration(s) is no longer provided to the UE until one or more conditions for providing the retransmission configuration are met 610. These conditions may be the same as or different from the previously monitored conditions. If the network determines that one or more deactivation conditions have not been met, the network may periodically provide one or more retransmission configurations to the UE at 650. The network may continue to provide one or more retransmission configurations to the UE while continuing to monitor for one or more deactivation conditions.

It may be noted that the example embodiments described in this disclosure may be combined; for example, the repeat/retransmission configuration shown in fig. 5 may be triggered, after which time the network may periodically provide additional repeat/retransmission configurations as shown in fig. 4 without triggering based on one or more conditions.

Fig. 7 illustrates potential steps of an example method 700. The example method 700 may include: transmitting signaling to the user equipment for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block 710; and receiving 720 a retransmission of the at least one transport block from the user equipment. The example method 700 may be performed, for example, with a network node, a gNB, an eNB, a base station, etc.

Fig. 8 illustrates potential steps of an example method 800. The example method 800 may include: receiving signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block 810; and performing an uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block 820. The example method 800 may be performed, for example, with a UE.

Fig. 9 illustrates potential steps of an example method 900. The example method 900 may include: determining 910 the number of transport blocks that have been lost; and in response to determining the number of transport blocks that have been lost, sending signaling 920 to the user equipment for scheduling retransmission of at least one of the transport blocks that have been lost. The example method 900 may be performed, for example, with a network node, a gNB, an eNB, a base station, etc. It may be noted that the example method 900 may occur after the example method 700 or in conjunction with the example method 700.

Fig. 10 illustrates potential steps of an example method 1000. The example method 1000 may include: receiving signaling 1010 for scheduling transmission of one or more transport blocks; initiating transmission 1020 of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; receiving signaling 1030 for scheduling retransmission of at least one of the one or more transport blocks; and performing a retransmission 1040 of the at least one transport block based at least in part on the signaling for scheduling the retransmission of the at least one transport block. The example method 1000 may be performed, for example, with a UE.

According to an example embodiment, an apparatus may include: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: transmitting signaling for scheduling retransmission of at least one transport block in the uplink transport beam to the user equipment, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and receiving a retransmission of the at least one transport block from the user equipment.

The signaling to send the retransmission for the at least one transport block may be based at least in part on at least one of: the user equipment is using a traffic periodicity for an initial transmission of one or more transport blocks, a bundle size of an uplink transport bundle or a corresponding priority of at least one transport block.

The signaling for scheduling the retransmission of the at least one transport block may comprise at least one of: configured authorization, or dynamic authorization.

The signaling for scheduling retransmissions of at least one transport block may comprise a configured grant, wherein the signaling for scheduling initial transmissions of one or more transport blocks may comprise a dynamic grant or a configured grant.

The signaling for scheduling retransmissions of at least one transport block may comprise dynamic grants, wherein the signaling for scheduling initial transmissions of one or more transport blocks may comprise dynamic grants or configured grants.

The at least one transport block may comprise a last transport block of an uplink transport beam, or a last N transport blocks of an uplink transport beam, where N is greater than 1.

The modulation and coding scheme for the retransmission of the at least one transport block may be at least one of: inherit from or at least partially differ from the modulation and coding scheme indicated for the initial transmission of the one or more transport blocks.

The example apparatus may also be configured to: the method may include transmitting, to a user equipment, a radio resource control parameter configured to indicate a first number, wherein retransmission of at least one transport block may be configured to be scheduled after an initial transmission of the first number of one or more transport blocks.

The signaling for scheduling the retransmission of the at least one transport block may include at least an indication of the at least one transport block to be retransmitted, wherein the indication of the at least one transport block to be retransmitted may include at least one of: a bitmap, an index of at least one transport block, a set of indices, a number of last N transport blocks, where N is greater than 1, a fixed configuration associated with at least one transport block configured to be selected via a radio resource control message, or an indication of a formula for determining the at least one transport block.

The example apparatus may also be configured to: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

The sending signaling for scheduling retransmissions to the user equipment may further comprise: the number of transport blocks that have been lost is determined.

Determining the number of transport blocks that have been lost may include an example apparatus further configured to: the number of transport blocks that have been lost within the sliding time window is determined.

Determining the number of transport blocks that have been lost may include an example apparatus further configured to: it is determined that a ratio of the transport block that has been lost to one or more transport blocks that have been received during the predetermined time window is greater than a predetermined threshold.

The signaling for scheduling retransmissions of at least one transport block may be configured to schedule a last transport block of the transport blocks that have been lost for retransmissions.

The signaling for scheduling retransmissions of at least one transport block may be configured to schedule a set of indices of transport blocks that have been lost for retransmissions.

The signaling for scheduling the retransmission of the at least one transport block may comprise a plurality of signals correspondingly configured to schedule the retransmission of a respective one of the transport blocks that has been lost.

The example apparatus may also be configured to: periodically transmitting signaling for scheduling retransmission of one or more transport blocks without determining an additional number of transport blocks that have been lost; monitoring at least one deactivation condition; in response to determining that at least one deactivation condition has been met, ceasing to periodically send signaling for scheduling retransmission of one or more transport blocks without determining an additional number of transport blocks that have been lost; and monitoring whether a further number of transport blocks have been lost.

According to one aspect, an example method may be provided, comprising: transmitting signaling for scheduling retransmission of at least one transport block in the uplink transport beam to the user equipment, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and receiving a retransmission of the at least one transport block from the user equipment.

The transmission of signaling for retransmission of the at least one transport block may be based at least in part on at least one of: the user equipment is using a traffic periodicity for an initial transmission of one or more transport blocks, a bundle size of an uplink transport bundle, or a corresponding priority of at least one transport block.

The example method may further include: the method may include transmitting, to a user equipment, a radio resource control parameter configured to indicate a first number, wherein retransmission of at least one transport block may be configured to be scheduled after an initial transmission of the first number of one or more transport blocks.

The example method may further include: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of the at least one transport block.

Determining the number of transport blocks that have been lost may include: the number of transport blocks that have been lost within the sliding time window is determined.

Determining the number of transport blocks that have been lost may include: it is determined that a ratio of the transport block that has been lost to one or more transport blocks that have been received during the predetermined time window is greater than a predetermined threshold.

The example method may further include: periodically transmitting signaling for scheduling retransmission of one or more transport blocks without determining an additional number of transport blocks that have been lost; monitoring at least one deactivation condition; in response to determining that at least one deactivation condition has been met, ceasing to periodically send signaling for scheduling retransmission of one or more transport blocks without determining an additional number of transport blocks that have been lost; and monitoring whether a further number of transport blocks have been lost.

According to an example embodiment, an apparatus may include: circuitry configured to perform: transmitting signaling for scheduling retransmission of at least one transport block in the uplink transport beam to the user equipment, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and circuitry to perform: a retransmission of the at least one transport block is received from the user equipment.

According to an example embodiment, an apparatus may include: processing circuitry; memory circuitry comprising computer program code, the memory circuitry and the computer program code configured to, with the processing circuitry, enable an apparatus to: transmitting signaling for scheduling retransmission of at least one transport block in the uplink transport beam to the user equipment, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and receiving a retransmission of the at least one transport block from the user equipment.

As used in this disclosure, the term "circuitry" may refer to one or more or all of the following: (a) Hardware-only circuit implementations (such as implementations in analog and/or digital circuitry only) and (b) combinations of hardware circuitry and software, such as (as applicable): (i) A combination of analog and/or digital hardware circuit(s) and software/firmware, and (ii) any portion of the hardware processor(s) (including digital signal processor (s)) having software, and memory(s) that work together to cause a device (such as a mobile phone or server) to perform various functions and (c) a portion of the hardware circuit(s) and/or processor(s), such as microprocessor(s) or microprocessor(s), that require software (e.g., firmware) for operation, but that may not exist when the software is not required for operation. This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this disclosure, the term "circuitry" also encompasses an implementation of only a hardware circuit or processor (or processors) or a portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware. The term "circuitry" also encompasses, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in a server, cellular network device, or other computing or network device.

According to an example embodiment, an apparatus may include means for: transmitting signaling for scheduling retransmission of at least one transport block in the uplink transport beam to the user equipment, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and receiving a retransmission of the at least one transport block from the user equipment.

A processor, memory, and/or example algorithm(s) (which may be encoded as instructions, programs, or code) may be provided as example means for providing or causing performance of the operations.

According to one example embodiment, a non-transitory computer-readable medium includes instructions stored thereon that, when executed by at least one processor, cause the at least one processor to: causing transmission of signaling to the user equipment for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and causing reception of a retransmission from the at least one transport block of the user equipment.

According to one example embodiment, a non-transitory computer readable medium includes program instructions stored thereon for performing at least the following: causing transmission of signaling to the user equipment for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and causing reception of a retransmission from the at least one transport block of the user equipment.

According to another example embodiment, a machine-readable non-transitory program storage device may be provided that tangibly embodies machine-executable instructions for performing operations including: causing transmission of signaling to the user equipment for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and causing reception of a retransmission from the at least one transport block of the user equipment.

According to another example embodiment, a non-transitory computer-readable medium includes instructions that, when executed by an apparatus, cause the apparatus to perform at least the following: causing transmission of signaling to the user equipment for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and causing reception of a retransmission from the at least one transport block of the user equipment.

A computer-implemented system, comprising: at least one processor and at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the system to at least perform: causing transmission of signaling to the user equipment for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and causing reception of a retransmission from the at least one transport block of the user equipment.

A computer-implemented system, comprising: means for causing transmission of signaling to the user equipment for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and means for causing reception of a retransmission from at least one transport block of the user equipment.

According to an example embodiment, an apparatus may include: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: receiving signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and performing uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

The modulation and coding scheme for the retransmission of the at least one transport block may be at least one of: inherited from or at least partially different from the modulation and coding scheme indicated for the initial transmission of the one or more transport blocks.

The example apparatus may also be configured to: the method may include receiving a radio resource control parameter configured to indicate a first number, wherein retransmission of at least one transport block may be configured to be scheduled after an initial transmission of the first number of one or more transport blocks.

The signaling for scheduling the retransmission of the at least one transport block may comprise at least an indication of the at least one transport block to be retransmitted, wherein the indication of the at least one transport block to be retransmitted may comprise at least one of: a bitmap, an index of at least one transport block, a set of indices, a number of last N transport blocks, where N is greater than 1, a fixed configuration associated with at least one transport block configured to be selected via a radio resource control message, or an indication of a formula for determining the at least one transport block.

According to one aspect, an example method may be provided, comprising: receiving, with the user equipment, signaling for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and performing uplink transmission with the user equipment based at least in part on the signaling for scheduling retransmission of the at least one transport block.

The example method may further include: the method may include receiving a radio resource control parameter configured to indicate a first number, wherein retransmission of at least one transport block may be configured to be scheduled after an initial transmission of the first number of one or more transport blocks.

According to an example embodiment, an apparatus may include: circuitry configured to perform: receiving, with the user equipment, signaling for scheduling retransmission of at least one transport block in the uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and circuitry configured to: uplink transmissions are performed with the user equipment based at least in part on signaling for scheduling retransmissions of at least one transport block.

According to an example embodiment, an apparatus may include: processing circuitry; memory circuitry comprising computer program code, the memory circuitry and the computer program code configured to, with the processing circuitry, enable the apparatus to: receiving signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and performing uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to an example embodiment, an apparatus may include means for: receiving signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and performing uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to one example embodiment, a non-transitory computer-readable medium includes instructions stored thereon that, when executed by at least one processor, cause the at least one processor to: causing reception of signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and causing performance of an uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to one example embodiment, a non-transitory computer readable medium includes program instructions stored thereon for performing at least the following: causing reception of signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and causing performance of an uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to another example embodiment, a machine-readable non-transitory program storage device may be provided that tangibly embodies machine-executable instructions for performing operations including: causing reception of signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and causing performance of an uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to another example embodiment, a non-transitory computer-readable medium includes instructions that, when executed by an apparatus, cause the apparatus to perform at least the following: causing reception of signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and causing performance of an uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

A computer-implemented system, comprising: at least one processor and at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the system to at least perform: causing reception of signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and causing performance of an uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

A computer-implemented system, comprising: means for causing reception of signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling retransmission of the at least one transport block may comprise at least one of: an indication of at least one resource for retransmission, a copy of at least one transport block, or an indication of whether a redundancy version of at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for retransmission, an indication of periodicity for retransmission, an indication of at least one transport block to be retransmitted, an indication of a link between signaling for scheduling retransmission of at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request process to be performed, or an indication of a hybrid automatic repeat request process number associated with at least one transport block; and means for causing performance of an uplink transmission based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to an example embodiment, an apparatus may include: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

Determining the number of transport blocks that have been lost may include the example apparatus further configured to: the number of transport blocks that have been lost within the sliding time window is determined.

Determining the number of transport blocks that have been lost may include the example apparatus further configured to: it is determined that a ratio of the transport block that has been lost to one or more transport blocks that have been received during the predetermined time window is greater than a predetermined threshold.

The signaling for scheduling retransmissions of at least one transport block may comprise a plurality of signals correspondingly configured to schedule retransmissions of a respective one of said transport blocks that have been lost.

The signaling to send the retransmission for the at least one transport block may be based at least in part on at least one of: the user equipment is using a traffic periodicity for transmission of the one or more transport blocks, a bundle size associated with the at least one transport block, or a corresponding priority of the at least one transport block.

According to one aspect, an example method may be provided, comprising: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

The transmission of signaling for retransmission of the at least one transport block may be based at least in part on at least one of: the user equipment is using a traffic periodicity for transmission of the one or more transport blocks, a bundle size associated with the at least one transport block, or a corresponding priority of the at least one transport block.

According to an example embodiment, an apparatus may include: circuitry configured to perform: determining a number of transport blocks that have been lost; and circuitry configured to perform: in response to determining that the number of transport blocks has been lost, signaling is sent to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

According to an example embodiment, an apparatus may include: processing circuitry; memory circuitry comprising computer program code, the memory circuitry and the computer program code configured to, with the processing circuitry, enable the apparatus to: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

According to an example embodiment, an apparatus may include means for: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

According to one example embodiment, a non-transitory computer-readable medium includes instructions stored thereon that, when executed by at least one processor, cause the at least one processor to: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

According to one example embodiment, a non-transitory computer readable medium includes program instructions stored thereon for performing at least the following: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

According to another example embodiment, a machine-readable non-transitory program storage device may be provided that tangibly embodies machine-executable instructions for performing operations including: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

According to another example embodiment, a non-transitory computer-readable medium includes instructions that, when executed by an apparatus, cause the apparatus to perform at least the following: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

A computer-implemented system, comprising: at least one processor and at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the system to at least perform: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost.

A computer-implemented system, comprising: means for determining a number of transport blocks that have been lost; and means for sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that have been lost in response to determining that the number of transport blocks has been lost.

According to an example embodiment, an apparatus may include: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: receiving signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; receiving signaling for scheduling retransmission of at least one of the one or more transport blocks; and performing retransmission of the at least one transport block based at least in part on signaling for scheduling retransmission of the at least one transport block.

The signaling for scheduling the transmission of the one or more transport blocks may include at least one of: configured authorization, or dynamic authorization.

The signaling for scheduling retransmissions of at least one transport block may be configured to schedule a last transport block for retransmissions.

The signaling for scheduling retransmissions of at least one transport block may be configured to schedule a set of transport block indexes for retransmissions.

The signaling for scheduling the retransmission of the at least one transport block may comprise a signal configured accordingly to schedule the retransmission of the respective transport block.

According to one aspect, an example method may be provided, comprising: receiving signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; receiving signaling for scheduling retransmission of at least one of the one or more transport blocks; and performing retransmission of the at least one transport block based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to an example embodiment, an apparatus may include: circuitry configured to perform: receiving signaling for scheduling transmission of one or more transport blocks; circuitry configured to perform: initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; circuitry configured to perform: receiving signaling for scheduling retransmission of at least one of the one or more transport blocks; and circuitry configured to perform: the retransmission of the at least one transport block is performed based at least in part on signaling for scheduling the retransmission of the at least one transport block.

According to an example embodiment, an apparatus may include: processing circuitry; memory circuitry comprising computer program code, the memory circuitry and the computer program code configured to, with the processing circuitry, enable the apparatus to: receiving signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; receiving signaling for scheduling retransmission of at least one of the one or more transport blocks; and performing retransmission of the at least one transport block based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to an example embodiment, an apparatus may include means for: receiving signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; receiving signaling for scheduling retransmission of at least one of the one or more transport blocks; and performing retransmission of the at least one transport block based at least in part on signaling for scheduling retransmission of the at least one transport block.

According to one example embodiment, a non-transitory computer-readable medium includes instructions stored thereon that, when executed by at least one processor, cause the at least one processor to: causing reception of signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; causing reception of signaling for scheduling retransmission of at least one of the one or more transport blocks; and causing performance of a retransmission of the at least one transport block based at least in part on signaling for scheduling the retransmission of the at least one transport block.

According to one example embodiment, a non-transitory computer readable medium includes program instructions stored thereon for performing at least the following: causing reception of signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; causing reception of signaling for scheduling retransmission of at least one of the one or more transport blocks; and causing performance of a retransmission of the at least one transport block based at least in part on signaling for scheduling the retransmission of the at least one transport block.

According to another example embodiment, a machine-readable non-transitory program storage device may be provided that tangibly embodies machine-executable instructions for performing operations including: causing reception of signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; causing reception of signaling for scheduling retransmission of at least one of the one or more transport blocks; and causing performance of a retransmission of the at least one transport block based at least in part on signaling for scheduling the retransmission of the at least one transport block.

According to another example embodiment, a non-transitory computer-readable medium includes instructions that, when executed by an apparatus, cause the apparatus to perform at least the following: causing reception of signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; causing reception of signaling for scheduling retransmission of at least one of the one or more transport blocks; and causing performance of a retransmission of the at least one transport block based at least in part on signaling for scheduling the retransmission of the at least one transport block.

A computer-implemented system, comprising: at least one processor and at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the system to at least perform: causing reception of signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; causing reception of signaling for scheduling retransmission of at least one of the one or more transport blocks; and causing performance of a retransmission of the at least one transport block based at least in part on signaling for scheduling the retransmission of the at least one transport block.

A computer-implemented system, comprising: means for causing reception of signaling for scheduling transmission of one or more transport blocks; means for initiating transmission of the one or more transport blocks based at least in part on signaling for scheduling transmission of the one or more transport blocks; means for causing reception of signaling for scheduling retransmission of at least one of the one or more transport blocks; and means for causing performance of a retransmission of the at least one transport block based at least in part on signaling for scheduling the retransmission of the at least one transport block.

As used herein, the term "non-transitory" is a limitation on the medium itself (i.e., tangible, not signals), and not on the durability of data storage (e.g., RAM and ROM).

The application may be further described using the following examples:

Example 1: an apparatus for communication, comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: transmitting signaling to a user equipment for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for the retransmission, an indication of whether a copy of the at least one transport block, or a redundancy version of the at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for the retransmission, an indication of periodicity of the retransmission, an indication of the at least one transport block to be retransmitted, an indication of a link between the signaling of the retransmission of the at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with the at least one transport block; and receiving the retransmission of the at least one transport block from the user equipment.

Example 2: the apparatus of embodiment 1, wherein sending the signaling for retransmission of the at least one transport block is based at least in part on at least one of: the user equipment is using a traffic periodicity for an initial transmission of one or more transport blocks, a beam size of the uplink transport beam, or a respective priority of the at least one transport block.

Example 3: the apparatus of embodiment 1, wherein the signaling to schedule the retransmission of the at least one transport block comprises at least one of: configured authorization, or dynamic authorization.

Example 4: the apparatus of embodiment 1, wherein the signaling to schedule the retransmission of the at least one transport block comprises a configured grant, wherein the signaling to schedule an initial transmission of one or more transport blocks comprises a dynamic grant or a configured grant.

Example 5: the apparatus of embodiment 1, wherein the signaling to schedule the retransmission of the at least one transport block comprises dynamic grant, wherein signaling to schedule an initial transmission of one or more transport blocks comprises dynamic grant or configured grant.

Example 6: the apparatus of embodiment 1, wherein the at least one transport block comprises a last transport block of the uplink transport beam, or a last N transport blocks of the uplink transport beam, wherein the N is greater than 1.

Example 7: the apparatus of embodiment 1, wherein the modulation and coding scheme for the retransmission of the at least one transport block is at least one of: inherit from or at least partially differ from the modulation and coding scheme indicated for the initial transmission of the one or more transport blocks.

Example 8: the apparatus of embodiment 1, wherein the at least one memory stores instructions that, when executed by the at least one processor, cause the apparatus to: transmitting to the user equipment a radio resource control parameter configured to indicate a first number, wherein the retransmission of the at least one transport block is configured to be scheduled after an initial transmission of the first number of one or more transport blocks.

Example 9: the apparatus of embodiment 1, wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least: an indication of the at least one transport block to be retransmitted, wherein the indication of the at least one transport block to be retransmitted comprises at least one of: a bit map, an index of the at least one transport block, a set of indices, a number of last N transport blocks, wherein the N is greater than 1, a fixed configuration associated with the at least one transport block configured to be selected via a radio resource control message, or an indication of a formula for determining the at least one transport block.

Example 10: the apparatus of embodiment 1, wherein sending the signaling to the user equipment for scheduling retransmissions further comprises: the number of transport blocks that have been lost is determined.

Example 11: the apparatus of embodiment 10, wherein determining the number of the transport blocks that have been lost comprises: the at least one memory stores instructions that, when executed by the at least one processor, cause the apparatus to: the number of transport blocks that have been lost within the sliding time window is determined.

Example 12: the apparatus of embodiment 10, wherein determining the number of the transport blocks that have been lost comprises: the at least one memory stores instructions that, when executed by the at least one processor, cause the apparatus to: it is determined that a ratio of the transport block that has been lost to one or more transport blocks that have been received during a predetermined time window is greater than a predetermined threshold.

Example 13: the apparatus of embodiment 10, wherein the at least one memory stores instructions that, when executed by the at least one processor, cause the apparatus to: periodically transmitting signaling for scheduling retransmission of one or more transport blocks without determining an additional number of transport blocks that have been lost; monitoring at least one deactivation condition; in response to determining that the at least one deactivation condition has been met, ceasing to periodically send signaling for scheduling the retransmission of the one or more transport blocks without determining the additional number of transport blocks that have been lost; and monitoring whether the further number of transport blocks has been lost.

Example 14: a method of communication, comprising: transmitting signaling to a user equipment for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for the retransmission, an indication of whether a copy of the at least one transport block, or a redundancy version of the at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for the retransmission, an indication of periodicity of the retransmission, an indication of the at least one transport block to be retransmitted, an indication of a link between the signaling of the retransmission of the at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with the at least one transport block; and receiving the retransmission of the at least one transport block from the user equipment.

Example 15: the method of embodiment 14, wherein sending the signaling for retransmission of the at least one transport block is based at least in part on at least one of: the user equipment is using a traffic periodicity for an initial transmission of one or more transport blocks, a beam size of the uplink transport beam, or a respective priority of the at least one transport block.

Example 16: the method of embodiment 14 wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least one of: configured authorization, or dynamic authorization.

Example 17: the method of embodiment 14 wherein the signaling for scheduling the retransmission of the at least one transport block comprises a configured grant, wherein the signaling for scheduling an initial transmission of one or more transport blocks comprises a dynamic grant or a configured grant.

Example 18: the method of embodiment 14 wherein the signaling for scheduling the retransmission of the at least one transport block comprises dynamic grant, wherein signaling for scheduling an initial transmission of one or more transport blocks comprises dynamic grant or configured grant.

Example 19: the method of embodiment 14 wherein the at least one transport block comprises a last transport block of the uplink transport beam, or a last N transport blocks of the uplink transport beam, wherein the N is greater than 1.

Example 20: the method of embodiment 14 wherein the modulation and coding scheme for the retransmission of the at least one transport block is at least one of: inherit from or at least partially differ from the modulation and coding scheme indicated for the initial transmission of the one or more transport blocks.

Example 21: the method of embodiment 14, further comprising: transmitting to the user equipment a radio resource control parameter configured to indicate a first number, wherein the retransmission of the at least one transport block is configured to be scheduled after an initial transmission of the first number of one or more transport blocks.

Example 22: the method of embodiment 14 wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least: an indication of the at least one transport block to be retransmitted, wherein the indication of the at least one transport block to be retransmitted comprises at least one of: a bit map, an index of the at least one transport block, a set of indices, a number of last N transport blocks, wherein the N is greater than 1, a fixed configuration associated with the at least one transport block configured to be selected via a radio resource control message, or an indication of a formula for determining the at least one transport block.

Example 23: the method of embodiment 14, wherein sending the signaling to the user equipment for scheduling a retransmission further comprises: the number of transport blocks that have been lost is determined.

Example 24: the apparatus of embodiment 23, wherein determining the number of the transport blocks that have been lost comprises: the number of transport blocks that have been lost within the sliding time window is determined.

Example 25: the method of embodiment 23 wherein determining the number of transport blocks that have been lost comprises: it is determined that a ratio of the transport block that has been lost to one or more transport blocks that have been received during a predetermined time window is greater than a predetermined threshold.

Example 26: the method of embodiment 23, further comprising: periodically transmitting signaling for scheduling retransmission of one or more transport blocks without determining an additional number of transport blocks that have been lost; monitoring at least one deactivation condition; in response to determining that the at least one deactivation condition has been met, ceasing to periodically send signaling for scheduling the retransmission of the one or more transport blocks without determining the additional number of transport blocks that have been lost; and monitoring whether the further number of transport blocks has been lost.

Example 27: an apparatus for communication, comprising means for: transmitting signaling to a user equipment for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for the retransmission, an indication of whether a copy of the at least one transport block, or a redundancy version of the at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for the retransmission, an indication of periodicity of the retransmission, an indication of the at least one transport block to be retransmitted, an indication of a link between the signaling of the retransmission of the at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with the at least one transport block; and receiving the retransmission of the at least one transport block from the user equipment.

Example 28: a non-transitory computer readable medium comprising program instructions stored thereon for performing at least the following: causing transmission of signaling to a user equipment for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for the retransmission, an indication of whether a copy of the at least one transport block, or a redundancy version of the at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for the retransmission, an indication of periodicity of the retransmission, an indication of the at least one transport block to be retransmitted, an indication of a link between the signaling of the retransmission of the at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with the at least one transport block; and causing reception of the retransmission from the at least one transport block of the user equipment.

Example 29: an apparatus for communication, comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: receiving signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for the retransmission, an indication of whether a copy of the at least one transport block, or a redundancy version of the at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for the retransmission, an indication of periodicity of the retransmission, an indication of the at least one transport block to be retransmitted, an indication of a link between the signaling of the retransmission of the at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with the at least one transport block; and performing uplink transmission based at least in part on the signaling for scheduling the retransmission of the at least one transport block.

Example 30: the apparatus of embodiment 29, wherein the signaling to schedule the retransmission of the at least one transport block comprises at least one of: configured authorization, or dynamic authorization.

Example 31: the apparatus of embodiment 29, wherein the signaling to schedule the retransmission of the at least one transport block comprises a configured grant, wherein the signaling to schedule an initial transmission of one or more transport blocks comprises a dynamic grant or a configured grant.

Example 32: the apparatus of embodiment 29, wherein the signaling to schedule the retransmission of the at least one transport block comprises dynamic grant, wherein signaling to schedule an initial transmission of one or more transport blocks comprises dynamic grant or configured grant.

Example 33: the apparatus of embodiment 29, wherein the at least one transport block comprises: the last transport block of the uplink transport beam, or the last N transport blocks of the uplink transport beam, wherein the N is greater than 1.

Example 34: the apparatus of embodiment 29, wherein the modulation and coding scheme for the retransmission of the at least one transport block is at least one of: inherited from or at least partially different from the modulation and coding scheme indicated for the initial transmission of the one or more transport blocks.

Example 35: the apparatus of embodiment 29, wherein the at least one memory stores instructions that, when executed by the at least one processor, cause the apparatus to: a method includes receiving a radio resource control parameter configured to indicate a first number, wherein the retransmission of the at least one transport block is configured to be scheduled after an initial transmission of the first number of one or more transport blocks.

Example 36: the apparatus of embodiment 29, wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least: an indication of the at least one transport block to be retransmitted, wherein the indication of the at least one transport block to be retransmitted comprises at least one of: a bit map, an index of the at least one transport block, a set of indices, a number of last N transport blocks, wherein the N is greater than 1, a fixed configuration associated with the at least one transport block configured to be selected via a radio resource control message, or an indication of a formula for determining the at least one transport block.

Example 37: a method of communication, comprising: receiving signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for the retransmission, an indication of whether a copy of the at least one transport block, or a redundancy version of the at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for the retransmission, an indication of periodicity of the retransmission, an indication of the at least one transport block to be retransmitted, an indication of a link between the signaling of the retransmission of the at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with the at least one transport block; and performing uplink transmission based at least in part on the signaling for scheduling the retransmission of the at least one transport block.

Example 38: the method of embodiment 37 wherein the signaling to schedule the retransmission of the at least one transport block comprises at least one of: configured authorization, or dynamic authorization.

Example 39: the method of embodiment 37 wherein the signaling for scheduling the retransmission of the at least one transport block comprises a configured grant, wherein the signaling for scheduling an initial transmission of one or more transport blocks comprises a dynamic grant or a configured grant.

Example 40: the method of embodiment 37 wherein the signaling for scheduling the retransmission of the at least one transport block comprises dynamic grant, wherein signaling for scheduling an initial transmission of one or more transport blocks comprises dynamic grant or configured grant.

Example 41: the method of embodiment 37 wherein the at least one transport block comprises a last transport block of the uplink transport beam, or a last N transport blocks of the uplink transport beam, wherein the N is greater than 1.

Example 42: the method of embodiment 37 wherein the modulation and coding scheme used for the retransmission of the at least one transport block is at least one of: inherited from or at least partially different from the modulation and coding scheme indicated for the initial transmission of the one or more transport blocks.

Example 43: the method of embodiment 37, further comprising: a method includes receiving a radio resource control parameter configured to indicate a first number, wherein the retransmission of the at least one transport block is configured to be scheduled after an initial transmission of the first number of one or more transport blocks.

Example 44: the method of embodiment 37 wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least: the indication of the at least one transport block to be retransmitted, wherein the indication of the at least one transport block to be retransmitted comprises at least one of: a bit map, an index of the at least one transport block, a set of indices, a number of last N transport blocks, wherein the N is greater than 1, a fixed configuration associated with the at least one transport block configured to be selected via a radio resource control message, or an indication of a formula for determining the at least one transport block.

Example 45: an apparatus for communication, comprising means for: receiving signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for the retransmission, an indication of whether a copy of the at least one transport block, or a redundancy version of the at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for the retransmission, an indication of periodicity of the retransmission, an indication of the at least one transport block to be retransmitted, an indication of a link between the signaling of the retransmission of the at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with the at least one transport block; and performing uplink transmission based at least in part on the signaling for scheduling the retransmission of the at least one transport block.

Example 46: a non-transitory computer readable medium comprising program instructions stored thereon for performing at least the following: causing reception of signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least one of: an indication of at least one resource for the retransmission, an indication of whether a copy of the at least one transport block, or a redundancy version of the at least one transport block is to be retransmitted, an indication of a modulation and coding scheme for the retransmission, an indication of periodicity of the retransmission, an indication of the at least one transport block to be retransmitted, an indication of a link between the signaling of the retransmission of the at least one transport block and another scheduling grant, an indication of a hybrid automatic repeat request procedure to be performed, or an indication of a hybrid automatic repeat request procedure number associated with the at least one transport block; and causing performance of an uplink transmission based at least in part on the signaling for scheduling the retransmission of the at least one transport block.

Example 47: an apparatus for communication, comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that has been lost.

Example 48: the apparatus of embodiment 47, wherein the signaling to schedule the retransmission of the at least one transport block comprises at least one of: configured authorization, or dynamic authorization.

Example 49: the apparatus of embodiment 47, wherein determining the number of transport blocks that have been lost comprises: the at least one memory stores instructions that, when executed by the at least one processor, cause the apparatus to: the number of transport blocks that have been lost within the sliding time window is determined.

Example 50: the apparatus of embodiment 47, wherein determining the number of transport blocks that have been lost comprises: the at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to: it is determined that a ratio of the transport block that has been lost to one or more transport blocks that have been received during a predetermined time window is greater than a predetermined threshold.

Example 51: the apparatus of embodiment 47, wherein the signaling for scheduling the retransmission of the at least one transport block is configured to: the last transport block of the transport blocks that have been lost is scheduled for retransmission.

Example 52: the apparatus of embodiment 47, wherein the signaling for scheduling the retransmission of the at least one transport block is configured to: the index set of the transport blocks that have been lost is scheduled for retransmission.

Example 53: the apparatus of embodiment 47 wherein the signaling to schedule the retransmission of the at least one transport block comprises: and correspondingly configured to schedule a plurality of signals of retransmissions of a respective one of said transport blocks that have been lost.

Example 54: the apparatus of embodiment 47, wherein sending the signaling for retransmission of the at least one transport block is based at least in part on at least one of: the user equipment is using a traffic periodicity for transmission of one or more transport blocks, a bundle size associated with the at least one transport block, or a respective priority of the at least one transport block.

Example 55: the apparatus of embodiment 47, wherein the at least one memory stores instructions that, when executed by the at least one processor, cause the apparatus to: periodically transmitting signaling for scheduling retransmission of one or more transport blocks without determining an additional number of transport blocks that have been lost; monitoring at least one deactivation condition; in response to determining that the at least one deactivation condition has been met, ceasing to periodically send signaling for scheduling the retransmission of the one or more transport blocks without determining the additional number of transport blocks that have been lost; and monitoring whether the further number of transport blocks has been lost.

Example 56: a method of communication, comprising: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that has been lost.

Example 57: the method of embodiment 56 wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least one of: configured authorization, or dynamic authorization.

Example 58: the method of embodiment 56 wherein determining the number of transport blocks that have been lost comprises: the number of transport blocks that have been lost within the sliding time window is determined.

Example 59: the method of embodiment 58 wherein determining the number of transport blocks that have been lost comprises: it is determined that a ratio of the transport block that has been lost to one or more transport blocks that have been received during a predetermined time window is greater than a predetermined threshold.

Example 60: the method of embodiment 56 wherein the signaling for scheduling the retransmission of the at least one transport block is configured to: the last transport block of the transport blocks that have been lost is scheduled for retransmission.

Example 61: the method of embodiment 56 wherein the signaling for scheduling the retransmission of the at least one transport block is configured to: the index set of the transport blocks that have been lost is scheduled for retransmission.

Example 62: the method of embodiment 56 wherein the signaling for scheduling the retransmission of the at least one transport block comprises: and correspondingly configured to schedule a plurality of signals of retransmissions of a respective one of said transport blocks that have been lost.

Example 63: the method of embodiment 56 wherein sending the signaling for retransmission of the at least one transport block is based at least in part on at least one of: the user equipment is using a traffic periodicity for transmission of one or more transport blocks, a bundle size associated with the at least one transport block, or a respective priority of the at least one transport block.

Example 64: the method of embodiment 56, further comprising: periodically transmitting signaling for scheduling retransmission of one or more transport blocks without determining an additional number of transport blocks that have been lost; monitoring at least one deactivation condition; in response to determining that the at least one deactivation condition has been met, ceasing to periodically send signaling for scheduling the retransmission of the one or more transport blocks without determining the additional number of transport blocks that have been lost; and monitoring whether the further number of transport blocks has been lost.

Example 65: an apparatus for communication, comprising means for: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, sending signaling to the user equipment to schedule retransmission of at least one of the transport blocks that has been lost.

Example 66: a non-transitory computer readable medium comprising program instructions stored thereon for performing at least the following: determining a number of transport blocks that have been lost; and in response to determining that the number of transport blocks has been lost, causing transmission of signaling to the user equipment for scheduling retransmission of at least one of the transport blocks that has been lost.

Example 67: an apparatus for communication, comprising: at least one processor; and at least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: receiving signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on the signaling to schedule the transmission of the one or more transport blocks; receiving signaling for scheduling retransmission of at least one transport block of the one or more transport blocks; and performing retransmission of the at least one transport block based at least in part on the signaling to schedule the retransmission of the at least one transport block.

Example 68: the apparatus of embodiment 67, wherein the signaling to schedule the transmission of the one or more transport blocks comprises at least one of: configured authorization, or dynamic authorization.

Example 69: the apparatus of embodiment 67 wherein the signaling for scheduling the retransmission of the at least one transport block is configured to: the last transport block is scheduled for retransmission.

Example 70: the apparatus of embodiment 67 wherein the signaling for scheduling the retransmission of the at least one transport block is configured to: the set of transport block indexes is scheduled for retransmission.

Example 71: the apparatus of embodiment 67 wherein the signaling to schedule the retransmission of the at least one transport block comprises: and accordingly configured to schedule the retransmitted signals of the corresponding transport blocks.

Example 72: a method of communication, comprising: receiving, with a user equipment, signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on the signaling to schedule the transmission of the one or more transport blocks; receiving signaling for scheduling retransmission of at least one transport block of the one or more transport blocks; and performing retransmission of the at least one transport block based at least in part on the signaling to schedule the retransmission of the at least one transport block.

Example 73: the method of embodiment 72 wherein the signaling to schedule the transmission of the one or more transport blocks comprises at least one of: configured authorization, or dynamic authorization.

Example 74: the method of embodiment 72 wherein the signaling for scheduling the retransmission of the at least one transport block is configured to: the last transport block is scheduled for retransmission.

Example 75: the method of embodiment 72 wherein the signaling for scheduling the retransmission of the at least one transport block is configured to: the set of transport block indexes is scheduled for retransmission.

Example 76: the method of embodiment 72 wherein the signaling for scheduling the retransmission of the at least one transport block comprises: and accordingly configured to schedule signals for retransmission of the corresponding transport block.

Example 77: an apparatus for communication, comprising means for receiving signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on the signaling to schedule the transmission of the one or more transport blocks; receiving signaling for scheduling retransmission of at least one transport block of the one or more transport blocks; and retransmitting the at least one transport block based at least in part on the signaling to schedule the retransmission of the at least one transport block.

Example 78: a non-transitory computer readable medium comprising program instructions stored thereon for performing at least the following: causing reception of signaling for scheduling transmission of one or more transport blocks; initiating transmission of the one or more transport blocks based at least in part on the signaling to schedule the transmission of the one or more transport blocks; causing reception of signaling for scheduling retransmission of at least one of the one or more transport blocks; and causing performance of a retransmission of the at least one transport block based at least in part on the signaling for scheduling the retransmission of the at least one transport block.

It should be understood that the foregoing description is only illustrative. Various alternatives and modifications can be devised by those skilled in the art. For example, features recited in the various dependent embodiments may be combined with one another in any suitable combination(s). In addition, features from the different embodiments described above may be selectively combined into new embodiments. Accordingly, this specification is intended to embrace all such alternatives, modifications and variances which fall within the scope of the appended embodiments.

Claims

1. An apparatus for communication, comprising:

at least one processor; and

At least one non-transitory memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to:

Transmitting signaling to a user equipment for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least one of:

An indication of at least one resource for the retransmission,

An indication of whether a copy of the at least one transport block or a redundancy version of the at least one transport block is to be retransmitted,

An indication of the modulation and coding scheme used for the retransmission,

An indication of periodicity for the retransmission,

An indication of the at least one transport block to be retransmitted,

An indication of a link between the signaling for scheduling the retransmission of the at least one transport block and another scheduling grant,

An indication of a hybrid automatic repeat request process to be performed, or

An indication of a hybrid automatic repeat request process number associated with the at least one transport block; and

The retransmission of the at least one transport block is received from the user equipment.

2. A method of communication, comprising:

An indication of at least one resource for the retransmission,

An indication of the modulation and coding scheme used for the retransmission,

An indication of periodicity for the retransmission,

An indication of the at least one transport block to be retransmitted,

An indication of a hybrid automatic repeat request process to be performed, or

3. An apparatus for communication, comprising means for:

An indication of at least one resource for the retransmission,

An indication of the modulation and coding scheme used for the retransmission,

An indication of periodicity for the retransmission,

An indication of the at least one transport block to be retransmitted,

An indication of a hybrid automatic repeat request process to be performed, or

4. An apparatus for communication, comprising:

at least one processor; and

Receiving signaling for scheduling retransmission of at least one transport block in an uplink transport beam, wherein the signaling for scheduling the retransmission of the at least one transport block comprises at least one of:

An indication of at least one resource for the retransmission,

An indication of the modulation and coding scheme used for the retransmission,

An indication of periodicity for the retransmission,

An indication of the at least one transport block to be retransmitted,

An indication of a hybrid automatic repeat request process to be performed, or

Uplink transmissions are performed based at least in part on the signaling for scheduling the retransmission of the at least one transport block.

5. A method of communication, comprising:

An indication of at least one resource for the retransmission,

An indication of the modulation and coding scheme used for the retransmission,

An indication of periodicity for the retransmission,

An indication of the at least one transport block to be retransmitted,

An indication of a hybrid automatic repeat request process to be performed, or

6. An apparatus for communication, comprising means for:

An indication of at least one resource for the retransmission,

An indication of the modulation and coding scheme used for the retransmission,

An indication of periodicity for the retransmission,

An indication of the at least one transport block to be retransmitted,

An indication of a hybrid automatic repeat request process to be performed, or

7. An apparatus for communication, comprising:

at least one processor; and

Determining a number of transport blocks that have been lost; and

In response to determining that the number of transport blocks has been lost, signaling is sent to the user equipment to schedule retransmission of at least one of the transport blocks that has been lost.

8. A method of communication, comprising:

Determining a number of transport blocks that have been lost; and

9. An apparatus for communication, comprising:

at least one processor; and

receiving signaling for scheduling transmission of one or more transport blocks;

initiating transmission of the one or more transport blocks based at least in part on the signaling to schedule the transmission of the one or more transport blocks;

receiving signaling for scheduling retransmission of at least one transport block of the one or more transport blocks; and

Retransmission of the at least one transport block is performed based at least in part on the signaling to schedule the retransmission of the at least one transport block.

10. A method of communication, comprising:

Receiving, with a user equipment, signaling for scheduling transmission of one or more transport blocks;