Timing parameter determination in asymmetric communication scenarios
The method for UE communication with multiple TRPs using DCI messages and TCI states addresses timing parameter challenges in asymmetric scenarios, enhancing synchronization and data transmission efficiency.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- QUALCOMM INC
- Filing Date
- 2025-01-23
- Publication Date
- 2026-07-30
AI Technical Summary
Existing wireless communication systems face challenges in determining timing parameters in asymmetric communication scenarios, particularly in scenarios involving multiple transmission-reception points (TRPs) with differing timing advance groups, leading to inefficiencies in data transmission and synchronization.
A method and apparatus for a user equipment (UE) to communicate with multiple TRPs, receiving DCI messages with one-bit indicator fields to determine downlink reference timing or timing advance (TA) offsets based on TCI states and synchronization signal blocks (SSBs) associated with different TAGs, enabling precise timing adjustments for PRACH messages.
Enhances synchronization and data transmission efficiency by accurately determining downlink reference timing and TA offsets, improving communication performance in asymmetric scenarios with multiple TRPs.
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Figure CN2025074218_30072026_PF_FP_ABST
Abstract
Description
TIMING PARAMETER DETERMINATION IN ASYMMETRIC COMMUNICATION SCENARIOSFIELD OF TECHNOLOGY
[0001] The following relates to wireless communications, including timing parameter determination in asymmetric communication scenarios.BACKGROUND
[0002] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-APro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE) .SUMMARY
[0003] The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.
[0004] A method for wireless communications by a user equipment (UE) is described. The method may include communicating with a first transmission-reception point (TRP) associated with a first timing advance group (TAG) and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, receiving, from the first TRP, a downlink control information (DCI) message including a one-bit indicator field associated with a downlink reference timing, receiving a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first transmission configuration indicator (TCI) states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG, and transmitting a physical random access channel (PRACH) message to the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based on a value of the one-bit indicator field.
[0005] A UE for wireless communications is described. The UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the UE to communicate with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, receive, from the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing, receive a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG, and transmit a PRACH message to the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based on a value of the one-bit indicator field.
[0006] Another UE for wireless communications is described. The UE may include means for communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, means for receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing, means for receiving a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG, and means for transmitting a PRACH message to the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based on a value of the one-bit indicator field.
[0007] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to communicate with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, receive, from the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing, receive a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG, and transmit a PRACH message to the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based on a value of the one-bit indicator field.
[0008] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value and the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including a second value.
[0009] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with a serving cell physical cell identifier (PCI) and the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0010] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with the first TAG and the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with the second TAG.
[0011] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the UE may be indicated with a first indicated TCI state and a second indicated TCI state, the downlink reference timing may be determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including a first value and based on the first indicated TCI state, and the downlink reference timing may be determined based on the value of the one-bit indicator field including a second value and based on the second indicated TCI state.
[0012] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the first value and based on the first indicated TCI state being associated with a serving cell PCI.
[0013] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on value of the one-bit indicator field including the first value and based on the first indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0014] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second indicated TCI state being associated with a serving cell PCI.
[0015] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0016] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the first value and based on the first indicated TCI state being associated with the first TAG.
[0017] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the first value and based on the first indicated TCI state being associated with the second TAG.
[0018] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second indicated TCI state being associated with the first TAG.
[0019] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second indicated TCI state being associated with the second TAG.
[0020] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the first TRP and the second TRP may be associated with a same cell, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value, and the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including a second value.
[0021] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the first TAG may be associated with a TCI state of a control resource set (CORESET) that may be associated with a Type-1 physical downlink control channel (PDCCH) common search space (CSS) .
[0022] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the one-bit indicator field includes a PRACH downlink reference timing field, a pathloss (PL) offset indicator field, or a PRACH association indicator field.
[0023] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a first set of synchronization signal blocks (SSBs) from the first TRP and a second set of SSBs from the second TRP, where the first set of SSBs may be associated with a serving cell PCI and the second set of SSBs may be associated with a non-serving cell PCI.
[0024] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the DCI message may be associated with a PDCCH order DCI and transmitting the PRACH message to the first TRP or the second TRP may be based on the PDCCH order DCI.
[0025] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving control signaling that indicates a first identifier of the first TAG that may be associated with a serving cell PCI, a second identifier of the second TAG that may be associated with a non-serving cell PCI, or both.
[0026] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the downlink reference timing includes a timing associated with a first detected path in a time domain of either one of the first set of downlink reference signals or one of the second set of downlink reference signals.
[0027] A method for wireless communications by a UE is described. The method may include communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a timing advance (TA) offset, and transmitting a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0028] A UE for wireless communications is described. The UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the UE to communicate with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, receive, from the first TRP, a DCI message including a one-bit indicator field associated with a TA offset, and transmit a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0029] Another UE for wireless communications is described. The UE may include means for communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, means for receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a TA offset, and means for transmitting a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0030] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to communicate with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, receive, from the first TRP, a DCI message including a one-bit indicator field associated with a TA offset, and transmit a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0031] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including a first value and the TA offset may be determined based on the value of the one-bit indicator field including a second value.
[0032] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with a serving cell PCI and the TA offset may be determined based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0033] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with the first TAG and the TA offset may be determined based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with the second TAG.
[0034] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the UE may be indicated with a first TCI state and a second TCI state, the TA offset may be determined based on the value of the one-bit indicator field including a first value and based on the first TCI state, and the TA offset may be determined based on the value of the one-bit indicator field including a second value and based on the second TCI state.
[0035] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with a serving cell PCI.
[0036] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the TA offset may be determined based on value of the one-bit indicator field including the first value and based on the first TCI state being associated with a non-serving cell PCI or an additional PCI.
[0037] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with a serving cell PCI.
[0038] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with a non-serving cell PCI or an additional PCI.
[0039] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with the first TAG.
[0040] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with the second TAG.
[0041] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with the first TAG.
[0042] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with the second TAG.
[0043] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the first TRP and the second TRP may be associated with a same cell, the TA offset may be determined based on the value of the one-bit indicator field including a first value, and the TA offset may be determined based on the value of the one-bit indicator field including a second value.
[0044] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the first TAG may be associated with a TCI state of a CORESET that may be associated with a Type-1 PDCCH CSS.
[0045] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the one-bit indicator field includes a TA offset field, a PL offset indicator field, or a PRACH association indicator field.
[0046] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a first set of SSBs from the first TRP and a second set of SSBs from the second TRP, where the first set of SSBs may be associated with a serving cell PCI and the second set of SSBs may be associated with a non-serving cell PCI.
[0047] In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the DCI message may be associated with a PDCCH order DCI and transmitting the PRACH message to the first TRP or the second TRP may be based on the PDCCH order DCI.
[0048] Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving control signaling that indicates a first TA offset associated with the first TAG, a second TA offset associated with the second TAG, or both, where the TA offset may be determined as either the first TA offset or the second TA offset based on the value of the one-bit indicator field.
[0049] A method for wireless communications by a network entity is described. The method may include communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing, outputting a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG, and obtaining a PRACH message from the UE via the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on a value of the one-bit indicator field.
[0050] A network entity for wireless communications is described. The network entity may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the network entity to communicate with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, output, via the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing, output a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG, and obtain a PRACH message from the UE via the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on a value of the one-bit indicator field.
[0051] Another network entity for wireless communications is described. The network entity may include means for communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, means for outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing, means for outputting a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG, and means for obtaining a PRACH message from the UE via the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on a value of the one-bit indicator field.
[0052] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to communicate with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, output, via the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing, output a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG, and obtain a PRACH message from the UE via the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on a value of the one-bit indicator field.
[0053] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value and the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including a second value.
[0054] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with a serving cell PCI and the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0055] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with the first TAG and the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with the second TAG.
[0056] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the UE may be indicated with a first TCI state and a second TCI state, the downlink reference timing may be determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including a first value and based on the first TCI state, and the downlink reference timing may be determined based on the value of the one-bit indicator field including a second value and based on the second TCI state.
[0057] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with a serving cell PCI.
[0058] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on value of the one-bit indicator field including the first value and based on the first TCI state being associated with a non-serving cell PCI or an additional PCI.
[0059] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with a serving cell PCI.
[0060] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with a non-serving cell PCI or an additional PCI.
[0061] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with the first TAG.
[0062] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with the second TAG.
[0063] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with the first TAG.
[0064] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with the second TAG.
[0065] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the first TRP and the second TRP may be associated with a same cell, the downlink reference timing may be determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value, and the downlink reference timing may be determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including a second value.
[0066] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the first TAG may be associated with a TCI state of a CORESET that may be associated with a Type-1 PDCCH CSS.
[0067] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the one-bit indicator field includes a PRACH downlink reference timing field, a PL offset indicator field, or a PRACH association indicator field.
[0068] Some examples of the method, network entities, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for outputting a first set of SSBs via the first TRP and a second set of SSBs via the second TRP, where the first set of SSBs may be associated with a serving cell PCI and the second set of SSBs may be associated with a non-serving cell PCI.
[0069] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the DCI message may be associated with a PDCCH order DCI and obtaining the PRACH message from the UE via the first TRP or the second TRP may be based on the PDCCH order DCI.
[0070] Some examples of the method, network entities, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for outputting control signaling that indicates a first identifier of the first TAG that may be associated with a serving cell PCI, a second identifier of the second TAG that may be associated with a non-serving cell PCI, or both.
[0071] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the downlink reference timing includes a timing associated with a first detected path in a time domain of either one of the first set of downlink reference signals or one of the second set of downlink reference signals.
[0072] A method for wireless communications by a network entity is described. The method may include communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a TA offset, and obtaining a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0073] A network entity for wireless communications is described. The network entity may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively be operable to execute the code to cause the network entity to communicate with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, output, via the first TRP, a DCI message including a one-bit indicator field associated with a TA offset, and obtain a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0074] Another network entity for wireless communications is described. The network entity may include means for communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, means for outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a TA offset, and means for obtaining a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0075] A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to communicate with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals, output, via the first TRP, a DCI message including a one-bit indicator field associated with a TA offset, and obtain a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0076] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including a first value and the TA offset may be determined based on the value of the one-bit indicator field including a second value.
[0077] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with a serving cell PCI and the TA offset may be determined based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0078] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with the first TAG and the TA offset may be determined based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with the second TAG.
[0079] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the UE may be indicated with a first TCI state and a second TCI state, the TA offset may be determined based on the value of the one-bit indicator field including a first value and based on the first TCI state, and the TA offset may be determined based on the value of the one-bit indicator field including a second value and based on the second TCI state.
[0080] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with a serving cell PCI.
[0081] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the TA offset may be determined based on value of the one-bit indicator field including the first value and based on the first TCI state being associated with a non-serving cell PCI or an additional PCI.
[0082] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with a serving cell PCI.
[0083] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with a non-serving cell PCI or an additional PCI.
[0084] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with the first TAG.
[0085] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with the second TAG.
[0086] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with the first TAG.
[0087] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the TA offset may be determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with the second TAG.
[0088] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the first TRP and the second TRP may be associated with a same cell, the TA offset may be determined based on the value of the one-bit indicator field including a first value, and the TA offset may be determined based on the value of the one-bit indicator field including a second value.
[0089] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the first TAG may be associated with a TCI state of a CORESET that may be associated with a Type-1 PDCCH CSS.
[0090] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the one-bit indicator field includes a TA offset field, a PL offset indicator field, or a PRACH association indicator field.
[0091] Some examples of the method, network entities, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for outputting a first set of SSBs via the first TRP and a second set of SSBs via the second TRP, where the first set of SSBs may be associated with a serving cell PCI and the second set of SSBs may be associated with a non-serving cell PCI.
[0092] In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the DCI message may be associated with a PDCCH order DCI and obtaining the PRACH message to the first TRP or the second TRP may be based on the PDCCH order DCI.
[0093] Some examples of the method, network entities, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for outputting control signaling that indicates a first TA offset associated with the first TAG, a second TA offset associated with the second TAG, or both, where the TA offset may be determined as either the first TA offset or the second TA offset based on the value of the one-bit indicator field.
[0094] Details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following figures may not be drawn to scale.BRIEF DESCRIPTION OF THE DRAWINGS
[0095] FIG. 1 shows an example of a wireless communications system that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.
[0096] FIG. 2 shows examples of wireless communications systems that support timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.
[0097] FIG. 3 shows an example of a process flow that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.
[0098] FIG. 4 shows an example of a process flow that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.
[0099] FIG. 5 shows an example of a process flow that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.
[0100] FIG. 6 shows an example of a process flow that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.
[0101] FIGs. 7 and 8 show block diagrams of devices that support timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.
[0102] FIG. 9 shows a block diagram of a communications manager that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.
[0103] FIG. 10 shows a diagram of a system including a device that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.
[0104] FIGs. 11 and 12 show block diagrams of devices that support timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.
[0105] FIG. 13 shows a block diagram of a communications manager that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.
[0106] FIG. 14 shows a diagram of a system including a device that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.
[0107] FIGs. 15 through 20 show flowcharts illustrating methods that support timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure.DETAILED DESCRIPTION
[0108] Some wireless communications system may support asymmetric deployments of downlink transmission-reception points (TRPs) and uplink TRPs. For instance, a user equipment (UE) may communicate with a first TRP (e.g., a downlink TRP) capable of transmitting downlink communications (e.g., control signaling, data signaling, and reference signaling) and receiving uplink communications. The UE may also communicate with a second TRP (e.g., an uplink TRP, a limited downlink TRP) capable of receiving uplink communications and transmitting “limited” downlink communications (e.g., reference signals, synchronization signal blocks (SSBs) ) . The first TRP and the second TRP may be associated with the same or different cells / network entities. In such deployments, different TRPs (e.g., downlink TRPs and uplink TRPs) may be associated with different timing advance groups (TAGs) , different physical cell identifiers (PCIs) , or both. However, some systems may not support utilization of multiple timing parameters (e.g., for communication synchronization) when two or more TAGs are configured. As such, devices of a wireless communications system may experience increased latency, reduced communication reliability, and reduced coverage in some deployments.
[0109] In accordance with one or more techniques described herein, a UE may be enabled to determine (e.g., select) one or more timing parameters (e.g., downlink reference timing, a timing advance (TA) offset) for communications (e.g., random access operations) with the multiple TRPs (e.g., associated with multiple TAGs) . In some examples, the UE may determine one or more timing parameters based on control information (e.g., a value of a field of a downlink control information (DCI) message) received from a network entity (e.g., via a TRP) and may interpret the control information in accordance with various options (e.g., Option 1, Option 2, Option 3, Option 4) described herein (e.g., including with reference to FIGs. 3–6) . In some examples, the UE may determine the timing parameters based on an association of one or more transmission configuration indicator (TCI) states with a PCI (e.g., a type of PCI) , with a TAG, or both.
[0110] Techniques described herein may enable UEs to determine a timing parameter (e.g., downlink reference timing, TA offset) that will be used for communications with multiple TRPs associated with different TAGs. By enabling the UE to determine timing parameters for TRPs associated with different TAGs, the UE may more accurately synchronize its communications (e.g., in the time domain) with each TRP in a multiple TRP deployment. As such, a wireless communications system may support increased data rates, increased communication reliability, and improved coverage, among other benefits.
[0111] Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further illustrated by and described with reference to process flows, apparatus diagrams, system diagrams, and flowcharts that relate to timing parameter determination in asymmetric communication scenarios.
[0112] FIG. 1 shows an example of a wireless communications system 100 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The wireless communications system 100 may include one or more devices, such as one or more network devices (e.g., network entities 105) , one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-APro network, a New Radio (NR) network, or a network operating in accordance with other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.
[0113] The network entities 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may include devices in different forms or having different capabilities. In various examples, a network entity 105 may be referred to as a network element, a mobility element, a radio access network (RAN) node, or network equipment, among other nomenclature. In some examples, network entities 105 and UEs 115 may wirelessly communicate via communication link (s) 125 (e.g., a radio frequency (RF) access link) . For example, a network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UEs 115 and the network entity 105 may establish the communication link (s) 125. The coverage area 110 may be an example of a geographic area over which a network entity 105 and a UE 115 may support the communication of signals according to one or more radio access technologies (RATs) .
[0114] The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communications with various types of devices in the wireless communications system 100 (e.g., other wireless communication devices, including UEs 115 or network entities 105) , as shown in FIG. 1.
[0115] As described herein, a node of the wireless communications system 100, which may be referred to as a network node, or a wireless node, may be a network entity 105 (e.g., any network entity described herein) , a UE 115 (e.g., any UE described herein) , a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, a node may be a UE 115. As another example, a node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first, second, and third nodes may be different relative to these examples. Similarly, reference to a UE 115, network entity 105, apparatus, device, computing system, or the like may include disclosure of the UE 115, network entity 105, apparatus, device, computing system, or the like being a node. For example, disclosure that a UE 115 is configured to receive information from a network entity 105 also discloses that a first node is configured to receive information from a second node.
[0116] In some examples, network entities 105 may communicate with a core network 130, or with one another, or both. For example, network entities 105 may communicate with the core network 130 via backhaul communication link (s) 120 (e.g., in accordance with an S1, N2, N3, or other interface protocol) . In some examples, network entities 105 may communicate with one another via backhaul communication link (s) 120 (e.g., in accordance with an X2, Xn, or other interface protocol) either directly (e.g., directly between network entities 105) or indirectly (e.g., via the core network 130) . In some examples, network entities 105 may communicate with one another via a midhaul communication link 162 (e.g., in accordance with a midhaul interface protocol) or a fronthaul communication link 168 (e.g., in accordance with a fronthaul interface protocol) , or any combination thereof. The backhaul communication link (s) 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., an electrical link, an optical fiber link) or one or more wireless links (e.g., a radio link, a wireless optical link) , among other examples or various combinations thereof. A UE 115 may communicate with the core network 130 via a communication link 155.
[0117] One or more of the network entities 105 or network equipment described herein may include or may be referred to as a base station 140 (e.g., a base transceiver station, a radio base station, an NR base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or giga-NodeB (either of which may be referred to as a gNB) , a 5G NB, a next-generation eNB (ng-eNB) , a Home NodeB, a Home eNodeB, or other suitable terminology) . In some examples, a network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within one network entity (e.g., a network entity 105 or a single RAN node, such as a base station 140) .
[0118] In some examples, a network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) , which may be configured to utilize a protocol stack that is physically or logically distributed among multiple network entities (e.g., network entities 105) , such as an integrated access and backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 105 may include one or more of a central unit (CU) , such as a CU 160, a distributed unit (DU) , such as a DU 165, a radio unit (RU) , such as an RU 170, a RAN Intelligent Controller (RIC) , such as an RIC 175 (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, such as an SMO system 180, or any combination thereof. An RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a TRP. One or more components of the network entities 105 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 105 may be located in distributed locations (e.g., separate physical locations) . In some examples, one or more of the network entities 105 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
[0119] The split of functionality between a CU 160, a DU 165, and an RU 170 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, or any combinations thereof) are performed at a CU 160, a DU 165, or an RU 170. For example, a functional split of a protocol stack may be employed between a CU 160 and a DU 165 such that the CU 160 may support one or more layers of the protocol stack and the DU 165 may support one or more different layers of the protocol stack. In some examples, the CU 160 may host upper protocol layer (e.g., layer 3 (L3) , layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaptation protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) . The CU 160 (e.g., one or more CUs) may be connected to a DU 165 (e.g., one or more DUs) or an RU 170 (e.g., one or more RUs) , or some combination thereof, and the DUs 165, RUs 170, or both may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU 165 and an RU 170 such that the DU 165 may support one or more layers of the protocol stack and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or multiple different cells (e.g., via one or multiple different RUs, such as an RU 170) . In some cases, a functional split between a CU 160 and a DU 165 or between a DU 165 and an RU 170 may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU 160, a DU 165, or an RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, the DU 165, or the RU 170) . A CU 160 may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU 160 may be connected to a DU 165 via a midhaul communication link 162 (e.g., F1, F1-c, F1-u) , and a DU 165 may be connected to an RU 170 via a fronthaul communication link 168 (e.g., open fronthaul (FH) interface) . In some examples, a midhaul communication link 162 or a fronthaul communication link 168 may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities (e.g., one or more of the network entities 105) that are in communication via such communication links.
[0120] In some wireless communications systems (e.g., the wireless communications system 100) , infrastructure and spectral resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, providing an IAB network architecture (e.g., to a core network 130) . In some cases, in an IAB network, one or more of the network entities 105 (e.g., network entities 105 or IAB node (s) 104) may be partially controlled by each other. The IAB node (s) 104 may be referred to as a donor entity or an IAB donor. A DU 165 or an RU 170 may be partially controlled by a CU 160 associated with a network entity 105 or base station 140 (such as a donor network entity or a donor base station) . The one or more donor entities (e.g., IAB donors) may be in communication with one or more additional devices (e.g., IAB node (s) 104) via supported access and backhaul links (e.g., backhaul communication link (s) 120) . IAB node (s) 104 may include an IAB mobile termination (IAB-MT) controlled (e.g., scheduled) by one or more DUs (e.g., DUs 165) of a coupled IAB donor. An IAB-MT may be equipped with an independent set of antennas for relay of communications with UEs 115 or may share the same antennas (e.g., of an RU 170) of IAB node (s) 104 used for access via the DU 165 of the IAB node (s) 104 (e.g., referred to as virtual IAB-MT (vIAB-MT) ) . In some examples, the IAB node (s) 104 may include one or more DUs (e.g., DUs 165) that support communication links with additional entities (e.g., IAB node (s) 104, UEs 115) within the relay chain or configuration of the access network (e.g., downstream) . In such cases, one or more components of the disaggregated RAN architecture (e.g., the IAB node (s) 104 or components of the IAB node (s) 104) may be configured to operate according to the techniques described herein.
[0121] For instance, an access network (AN) or RAN may include communications between access nodes (e.g., an IAB donor) , IAB node (s) 104, and one or more UEs 115. The IAB donor may facilitate connection between the core network 130 and the AN (e.g., via a wired or wireless connection to the core network 130) . That is, an IAB donor may refer to a RAN node with a wired or wireless connection to the core network 130. The IAB donor may include one or more of a CU 160, a DU 165, and an RU 170, in which case the CU 160 may communicate with the core network 130 via an interface (e.g., a backhaul link) . The IAB donor and IAB node (s) 104 may communicate via an F1 interface according to a protocol that defines signaling messages (e.g., an F1 AP protocol) . Additionally, or alternatively, the CU 160 may communicate with the core network 130 via an interface, which may be an example of a portion of a backhaul link, and may communicate with other CUs (e.g., including a CU 160 associated with an alternative IAB donor) via an Xn-C interface, which may be an example of another portion of a backhaul link.
[0122] IAB node (s) 104 may refer to RAN nodes that provide IAB functionality (e.g., access for UEs 115, wireless self-backhauling capabilities) . A DU 165 may act as a distributed scheduling node towards child nodes associated with the IAB node (s) 104, and the IAB-MT may act as a scheduled node towards parent nodes associated with IAB node (s) 104. That is, an IAB donor may be referred to as a parent node in communication with one or more child nodes (e.g., an IAB donor may relay transmissions for UEs through other IAB node (s) 104) . Additionally, or alternatively, IAB node (s) 104 may also be referred to as parent nodes or child nodes to other IAB node (s) 104, depending on the relay chain or configuration of the AN. The IAB-MT entity of IAB node (s) 104 may provide a Uu interface for a child IAB node (e.g., the IAB node (s) 104) to receive signaling from a parent IAB node (e.g., the IAB node (s) 104) , and a DU interface (e.g., a DU 165) may provide a Uu interface for a parent IAB node to signal to a child IAB node or UE 115.
[0123] For example, IAB node (s) 104 may be referred to as parent nodes that support communications for child IAB nodes, or may be referred to as child IAB nodes associated with IAB donors, or both. An IAB donor may include a CU 160 with a wired or wireless connection (e.g., backhaul communication link (s) 120) to the core network 130 and may act as a parent node to IAB node (s) 104. For example, the DU 165 of an IAB donor may relay transmissions to UEs 115 through IAB node (s) 104, or may directly signal transmissions to a UE 115, or both. The CU 160 of the IAB donor may signal communication link establishment via an F1 interface to IAB node (s) 104, and the IAB node (s) 104 may schedule transmissions (e.g., transmissions to the UEs 115 relayed from the IAB donor) through one or more DUs (e.g., DUs 165) . That is, data may be relayed to and from IAB node (s) 104 via signaling via an NR Uu interface to MT of IAB node (s) 104 (e.g., other IAB node (s) ) . Communications with IAB node (s) 104 may be scheduled by a DU 165 of the IAB donor or of IAB node (s) 104.
[0124] In the case of the techniques described herein applied in the context of a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture may be configured to support timing parameter determination in asymmetric communication scenarios as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally, or alternatively, be performed by one or more components of the disaggregated RAN architecture (e.g., components such as an IAB node, a DU 165, a CU 160, an RU 170, an RIC 175, an SMO system 180) .
[0125] A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, vehicles, or meters, among other examples.
[0126] The UEs 115 described herein may be able to communicate with various types of devices, such as UEs 115 that may sometimes operate as relays, as well as the network entities 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
[0127] The UEs 115 and the network entities 105 may wirelessly communicate with one another via the communication link (s) 125 (e.g., one or more access links) using resources associated with one or more carriers. The term “carrier” may refer to a set of RF spectrum resources having a defined PHY layer structure for supporting the communication link (s) 125. For example, a carrier used for the communication link (s) 125 may include a portion of an RF spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more PHY layer channels for a given RAT (e.g., LTE, LTE-A, LTE-APro, NR) . Each PHY layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. Communication between a network entity 105 and other devices may refer to communication between the devices and any portion (e.g., entity, sub-entity) of a network entity 105. For example, the terms “transmitting, ” “receiving, ” or “communicating, ” when referring to a network entity 105, may refer to any portion of a network entity 105 (e.g., a base station 140, a CU 160, a DU 165, a RU 170) of a RAN communicating with another device (e.g., directly or via one or more other network entities, such as one or more of the network entities 105) .
[0128] In some examples, such as in a carrier aggregation configuration, a carrier may have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute RF channel number (EARFCN) ) and may be identified according to a channel raster for discovery by the UEs 115. A carrier may be operated in a standalone mode, in which case initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode, in which case a connection is anchored using a different carrier (e.g., of the same or a different RAT) .
[0129] The communication link (s) 125 of the wireless communications system 100 may include downlink transmissions (e.g., forward link transmissions) from a network entity 105 to a UE 115, uplink transmissions (e.g., return link transmissions) from a UE 115 to a network entity 105, or both, among other configurations of transmissions. Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
[0130] A carrier may be associated with a particular bandwidth of the RF spectrum and, in some examples, the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100. For example, the carrier bandwidth may be one of a set of bandwidths for carriers of a particular RAT (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz) ) . Devices of the wireless communications system 100 (e.g., the network entities 105, the UEs 115, or both) may have hardware configurations that support communications using a particular carrier bandwidth or may be configurable to support communications using one of a set of carrier bandwidths. In some examples, the wireless communications system 100 may include network entities 105 or UEs 115 that support concurrent communications using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured for operating using portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.
[0131] Signal waveforms transmitted via a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) . In a system employing MCM techniques, a resource element may refer to resources of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing may be inversely related. The quantity of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) , such that a relatively higher quantity of resource elements (e.g., in a transmission duration) and a relatively higher order of a modulation scheme may correspond to a relatively higher rate of communication. A wireless communications resource may refer to a combination of an RF spectrum resource, a time resource, and a spatial resource (e.g., a spatial layer, a beam) , and the use of multiple spatial resources may increase the data rate or data integrity for communications with a UE 115.
[0132] The time intervals for the network entities 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of Ts=1 / (Δfmax·Nf) seconds, for which Δfmax may represent a supported subcarrier spacing, and Nf may represent a supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) . Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .
[0133] Each frame may include multiple consecutively-numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a quantity of slots. Alternatively, each frame may include a variable quantity of slots, and the quantity of slots may depend on subcarrier spacing. Each slot may include a quantity of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems, such as the wireless communications system 100, a slot may further be divided into multiple mini-slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., Nf) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.
[0134] A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) . In some examples, the TTI duration (e.g., a quantity of symbol periods in a TTI) may be variable. Additionally, or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .
[0135] Physical channels may be multiplexed for communication using a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed for signaling via a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET) ) for a physical control channel may be defined by a set of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to an amount of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space (CSS) sets configured for sending control information to UEs 115 (e.g., one or more UEs) or may include UE-specific search space sets for sending control information to a UE 115 (e.g., a specific UE) .
[0136] A network entity 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof. The term “cell” may refer to a logical communication entity used for communication with a network entity 105 (e.g., using a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a PCI, a virtual cell identifier (VCID) ) . In some examples, a cell also may refer to a coverage area 110 or a portion of a coverage area 110 (e.g., a sector) over which the logical communication entity operates. Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the network entity 105. For example, a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with coverage areas 110, among other examples.
[0137] A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs 115 with service subscriptions with the network provider supporting the macro cell. A small cell may be associated with a network entity 105 operating with lower power (e.g., a base station 140 operating with lower power) relative to a macro cell, and a small cell may operate using the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells may provide unrestricted access to the UEs 115 with service subscriptions with the network provider or may provide restricted access to the UEs 115 having an association with the small cell (e.g., the UEs 115 in a closed subscriber group (CSG) , the UEs 115 associated with users in a home or office) . A network entity 105 may support one or more cells and may also support communications via the one or more cells using one or multiple component carriers.
[0138] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) ) that may provide access for different types of devices.
[0139] In some examples, a network entity 105 (e.g., a base station 140, an RU 170) may be movable and therefore provide communication coverage for a moving coverage area, such as the coverage area 110. In some examples, coverage areas 110 (e.g., different coverage areas) associated with different technologies may overlap, but the coverage areas 110 (e.g., different coverage areas) may be supported by the same network entity (e.g., a network entity 105) . In some other examples, overlapping coverage areas, such as a coverage area 110, associated with different technologies may be supported by different network entities (e.g., the network entities 105) . The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the network entities 105 support communications for coverage areas 110 (e.g., different coverage areas) using the same or different RATs.
[0140] Some UEs 115, such as MTC or IoT devices, may be relatively low cost or low complexity devices and may provide for automated communication between machines (e.g., via Machine-to-Machine (M2M) communication) . M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a network entity 105 (e.g., a base station 140) without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application program that uses the information or presents the information to humans interacting with the application program. Some UEs 115 may be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
[0141] The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) . The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private communication or group communication and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.
[0142] In some examples, a UE 115 may be configured to support communicating directly with other UEs (e.g., one or more of the UEs 115) via a device-to-device (D2D) communication link, such as a D2D communication link 135 (e.g., in accordance with a peer-to-peer (P2P) , D2D, or sidelink protocol) . In some examples, one or more UEs 115 of a group that are performing D2D communications may be within the coverage area 110 of a network entity 105 (e.g., a base station 140, an RU 170) , which may support aspects of such D2D communications being configured by (e.g., scheduled by) the network entity 105. In some examples, one or more UEs 115 of such a group may be outside the coverage area 110 of a network entity 105 or may be otherwise unable to or not configured to receive transmissions from a network entity 105. In some examples, groups of the UEs 115 communicating via D2D communications may support a one-to-many (1: M) system in which each UE 115 transmits to one or more of the UEs 115 in the group. In some examples, a network entity 105 may facilitate the scheduling of resources for D2D communications. In some other examples, D2D communications may be carried out between the UEs 115 without an involvement of a network entity 105.
[0143] In some systems, a D2D communication link 135 may be an example of a communication channel, such as a sidelink communication channel, between vehicles (e.g., UEs 115) . In some examples, vehicles may communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these. A vehicle may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information relevant to a V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure, such as roadside units, or with the network via one or more network nodes (e.g., network entities 105, base stations 140, RUs 170) using vehicle-to-network (V2N) communications, or with both.
[0144] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the network entities 105 (e.g., base stations 140) associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.
[0145] The wireless communications system 100 may operate using one or more frequency bands, which may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) . Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, which may be referred to as clusters, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than one hundred kilometers) compared to communications using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
[0146] The wireless communications system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) RAT, or NR technology using an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. While operating using unlicensed RF spectrum bands, devices such as the network entities 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations using unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating using a licensed band (e.g., LAA) . Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
[0147] A network entity 105 (e.g., a base station 140, an RU 170) or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a network entity 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with a network entity 105 may be located at diverse geographic locations. A network entity 105 may include an antenna array with a set of rows and columns of antenna ports that the network entity 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may include one or more antenna arrays that may support various MIMO or beamforming operations. Additionally, or alternatively, an antenna panel may support RF beamforming for a signal transmitted via an antenna port.
[0148] The network entities 105 or the UEs 115 may use MIMO communications to exploit multipath signal propagation and increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. The multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry information associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords) . Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) , for which multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) , for which multiple spatial layers are transmitted to multiple devices.
[0149] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating along particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
[0150] A network entity 105 or a UE 115 may use beam sweeping techniques as part of beamforming operations. For example, a network entity 105 (e.g., a base station 140, an RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a network entity 105 multiple times along different directions. For example, the network entity 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission. Transmissions along different beam directions may be used to identify (e.g., by a transmitting device, such as a network entity 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the network entity 105.
[0151] Some signals, such as data signals associated with a particular receiving device, may be transmitted by a transmitting device (e.g., a network entity 105 or a UE 115) along a single beam direction (e.g., a direction associated with the receiving device, such as another network entity 105 or UE 115) . In some examples, the beam direction associated with transmissions along a single beam direction may be determined based on a signal that was transmitted along one or more beam directions. For example, a UE 115 may receive one or more of the signals transmitted by the network entity 105 along different directions and may report to the network entity 105 an indication of the signal that the UE 115 received with a highest signal quality or an otherwise acceptable signal quality.
[0152] In some examples, transmissions by a device (e.g., by a network entity 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or beamforming to generate a combined beam for transmission (e.g., from a network entity 105 to a UE 115) . The UE 115 may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured set of beams across a system bandwidth or one or more sub-bands. The network entity 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS) ) , which may be precoded or unprecoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook) . Although these techniques are described with reference to signals transmitted along one or more directions by a network entity 105 (e.g., a base station 140, an RU 170) , a UE 115 may employ similar techniques for transmitting signals multiple times along different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal along a single direction (e.g., for transmitting data to a receiving device) .
[0153] A receiving device (e.g., a UE 115) may perform reception operations in accordance with multiple receive configurations (e.g., directional listening) when receiving various signals from a transmitting device (e.g., a network entity 105) , such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, a receiving device may perform reception in accordance with multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions. In some examples, a receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal) . The single receive configuration may be aligned along a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR) , or otherwise acceptable signal quality based on listening according to multiple beam directions) .
[0154] The wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer may be IP-based. An RLC layer may perform packet segmentation and reassembly to communicate via logical channels. A MAC layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer also may implement error detection techniques, error correction techniques, or both to support retransmissions to improve link efficiency. In the control plane, an RRC layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a network entity 105 or a core network 130 supporting radio bearers for user plane data. A PHY layer may map transport channels to physical channels.
[0155] In some cases, the wireless communications system 100 may support two TA (2TA) values for an asymmetric downlink single-TRP (sTRP) and uplink multiple-TRP (mTRP) deployment scenarios. In such cases, a restriction that coresetPoolIndex is be configured for the 2TA feature may be removed. Moreover, one downlink reference timing may be supported and applied to both TAGs and one single n-TimingAdvanceoffset may be configured and applied to both TAGs. In some cases, any of the TCI states (e.g., configured at the UE 115) may be associated with any one of the two TAGs. A random access response (RAR) message carrying a TA adjustment for the two TAGs may be reused for 2TA. A medium access control-control element (MAC-CE) based TA adjustment for two TAGs may be reused for 2TA.
[0156] In some cases, the wireless communications system 100 may support a one-bit DCI field (e.g., in DCI format 1_0 for indicating pathloss (PL) offset for physical downlink control channel (PDCCH) -order physical random access channel (PRACH) . This DCI field may exists when a corresponding RRC parameter (e.g., which is an RRC parameter used to configure the presence of this one-bit DCI field) is enabled and at least one TCI state is configured with PL offset. In some cases, when one joint TCI state or one uplink TCI state is indicated in a unified TCI, a bit field index 0 of this field indicates that a PL offset is not included in the PRACH transmission power calculation, and a bit field index 1 of this field indicates that the PL offset associated with the indicated TCI state is included in the PRACH transmission power. This bit field may also be used to indicate other information.
[0157] In some cases, for indicating a PL offset for PDCCH-order PRACH when two joint TCI states or two uplink TCI states are indicated in unified TCI, a device may use the one-bit DCI field (e.g., in DCI 1_0) in accordance with a first option, which indicates the application of a PL offset on PRACH transmission. The first option may include that the bit field index 0 of this field indicates that the PL offset associated in the first indicated joint or uplink TCI state is included in the PRACH transmission power calculation, and that the bit field index 1 of this field indicates that the PL offset associated in the second indicated joint or uplink TCI state is included in the PRACH transmission power calculation. Additionally, or alternatively, other information may be indicated by this same one-bit DCI field for the PDCCH-order PRACH transmission.
[0158] The wireless communications system 100 may support asymmetric deployments of downlink TRPs and uplink TRPs. For instance, a UE 115 may communicate with a network entity 105 via one or more TRPs (e.g., downlink TRPs, uplink TRPs) . In such deployments, different TRPs (e.g., downlink TRPs and uplink TRPs) may be associated with different TAGs, and some systems may not support utilization of multiple timing parameters (e.g., for communication synchronization) when multiple TAGs are configured. As such, devices of the wireless communications system 100 may experience increased latency, reduced communication reliability, and reduced coverage.
[0159] As described herein, a UE 115 may be enabled to identify one or more timing parameters for transmitting random access messages to one or more TRPs. In some examples, the UE may determine one or more timing parameters based on a one-bit field of a DCI message received from a network entity 105, or based on an association of one or more TCI states with a PCI or a TAG, or both.
[0160] Techniques described herein may enable UEs to determine a common timing parameter (e.g., downlink reference timing, TA offset) that will be used for communications with multiple TRPs associated with different TAGs. By enabling UEs 115 to determine timing parameters for multiple TRPs associated with different TAGs, as described herein, UEs and TRPs may more accurately synchronize communications (e.g., in the time domain) with each other. As such, the wireless communications system 100 may support increased data rates, increased communication reliability, and improved coverage, among other benefits.
[0161] FIG. 2 shows an example of a wireless communications system 200-a and a wireless communications system 200-b that support timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. Each wireless communications system 200 may be an example of the wireless communications system 100. Each wireless communications system 200 may include a respective serving cell 205 (e.g., serving cell 205-a, serving cell 205-b) and one or more respective non-serving cells 210 (e.g., non-serving cell 210-a, non-serving cell 210-b, non-serving cell 210-c, non-serving cell 210-d) . Each cell may be associated with a respective PCI that is different from the other PCIs (e.g., different from each other PCI) . The wireless communications system 200-amay be an example of a first type of multi-cell scenario referred to as Scenario 1. The wireless communications system 200-b may be an example of a second type of multi-cell scenario referred to as Scenario 2.
[0162] A downlink TRP 220 may communicate both data and control signals in the downlink and uplink directions, whereas an uplink TRP 215 may receive data in the uplink direction and transmit limited downlink signals (e.g., reference signals, SSBs) in the downlink. Further, the uplink TRPs 215 may have limited (e.g., reduced) transmission power relative to the downlink TRPs 220. Thus, the uplink TRPs 215 may have more limited (e.g., reduced) downlink capabilities than the downlink TRPs 220. In some examples, a downlink TRP 220 may be a network entity 105, a macro node, or a central node. The uplink TRPs 215 may be connected to the downlink TRP 215 via backhaul. The uplink TRPs 215 may provide coverage extension relative to other multi-cell scenarios. If there are more uplink TRPs 215 than downlink TRPs 220, the multi-cell scenario may be referred to as an asymmetric multi-cell scenario. Although, the UE 115-a and the UE 115-b are shown communicating with particular TRPs, a UE 115 may be configured to communicate with any combination of TRPs.
[0163] In Scenario 1, the downlink TRP 220-amay belong to the serving cell 205-awhereas the uplink TRPs 215 may belong to the non-serving cells 210. Thus, in Scenario 1, the downlink TRP 220-a (e.g., SSB (s) transmitted from the downlink TRP 220-a and received by the UE 115-a) may be associated with a PCI (e.g., PCI A) of the serving cell 205-a, whereas the uplink TRPs 215 (e.g., SSB (s) transmitted from the TRP 215-a-1, TRP 215-a-2, TRP 215-b-1, or TRP 215-b-2 to the UE 115-a) may be associated with the PCIs of the non-serving cells 210 (e.g., PCI B and PCI C, respectively) . A PCI of a serving cell 205 may be referred to as the “serving cell PCI, ” and a PCI of a non-serving cell 210 may be referred to as a “non-serving cell PCI” or as an “additional PCI. ” The UE 115-amay communicate with (e.g., receive and / or transmit wireless communications, receive SSB (s) from) the downlink TRP 220-a and the uplink TRPs 215 in accordance with their respective PCIs.
[0164] In Scenario 2, each cell may have one or more downlink TRPs 220 (e.g., TRP 220-b, TRP 220-c, TRP 220-d) and one or more uplink TRPs 215, each of which may communicate with (e.g., transmit SSB (s) to) the UE 115-b. For example, the serving cell 205-b may include downlink TRP 220-c, uplink TRP 215-d-1, and uplink TRP 215-d-2, each of which may transmit one or more SSBs in accordance with a first PCI (e.g., PCI D) . Similarly, the non-serving cell 210-c may include downlink TRP 220-b, uplink TRP 215-c-1, and uplink TRP 215-c-2, each of which may transmit one or more SSBs in accordance with a second PCI (e.g., PCI E) . And the non-serving cell 210-d may include downlink TRP 220-d, uplink TRP 215-e-1, and uplink TRP 215-e-2, each of which may transmit one or more SSBs in accordance with a third PCI (e.g., PCI F) .Although shown with two non-serving cells 210, Scenario 2 may involve any quantity of non-serving cells 210.
[0165] For the purposes of the present disclosure, the term “multi-cell” may refer to scenarios where multiple serving cells 205 are configured. Comparatively, the term “inter-cell” may be used to refer to scenarios where one or more serving cells 205 are configured, while each serving cell 205 is associated with one or more non-serving cells 210.
[0166] In some cases, such as a multi-DCI based multi-TRP operation with two TAs, a reference point (e.g., a downlink reference timing) for various communications (e.g., physical uplink control channel (PUCCH) , physical uplink shared channel (PUSCH) , sounding reference signal (SRS) , and other signaling) may be associated with a first detected path (e.g., first in a time domain) of one of a corresponding downlink reference signal (s) of a reference cell (e.g., associated with one of the DLorJointTCIState control parameter) having a same TAG as the uplink signal.
[0167] For intra-cell multi-DCI based multi-TRP operation with two TAs, a reference point for a PRACH transmission triggered by a PDCCH order may be based on a PRACH association indicator. For instance, the reference point may be a first detected path (e.g., in time) of one of the downlink reference signal (s) in a downlink TCI state or joint TCI state of a reference cell associated with a same coresetPoolIndex as a PDCCH carrying the PDCCH order if the PRACH association indicator is a first value (e.g., 0) , and that of the other coresetPoolIndex if the PRACH association indicator is a second value (e.g., 1) .
[0168] For inter-cell multi-DCI based multi-TRP operation with two TAs, the reference point for PRACH transmission triggered by PDCCH order may also be based on the PRACH association indicator. For instance, if the PRACH association indicator is a first value (e.g., 0) , the reference timing may be a first detected path (e.g., in time) of one of the corresponding downlink reference signal (s) of downlink TCI state (s) of the reference cell associated with a first TAG. If the PRACH association indicator is a second value (e.g., 1) , the reference timing is the first detected path (in time) of one of the corresponding downlink reference signal (s) of downlink TCI state (s) of the reference cell associated with a second TAG.
[0169] For both Scenario 1 and Scenario 2, each TRP (e.g., downlink TRPs 220 and uplink TRPs 215) may be associated with a TAG (e.g., a first TAG or a second TAG) , and each TAG may be associated with various timing parameters (e.g., based on physical location or channel condition) used to synchronize (e.g., in a time domain) communications with the UE 115. For instance, each TRP may be associated with different SSBs, downlink reference timings, TA offsets, downlink-to-uplink switching times, and other parameters. In some cases, a UE 115 may be configured to use a same timing parameter (e.g., downlink reference timing, TA offset, n-TimingAdvanceoffset) for multiple TAGs. However, using a same timing parameter for communicating with TRPs associated with different TAGs may result in misalignment (e.g., in a time domain) between the UE 115 and the TRPs. As such, the UE 115 may experience increased latency, reduced coverage, and reduced communication reliability, among other effects.
[0170] In accordance with techniques described herein, a UE 115 may be configured to support multiple timing parameters (e.g., downlink reference timing, TA offset) when multiple (e.g., two) TAGs are configured (e.g., for inter-cell asymmetric downlink / uplink scenarios) . For example, the UE may support multiple downlink reference timings or TA offsets, where each downlink reference timing and each TA offset is associated with a given TAG. In some examples (e.g., for PDCCH ordered PRACH) , a UE 115 may obtain an indication of the timing parameter prior to transmitting a PRACH to one of the TRPs.
[0171] In some examples, such as for an asymmetric (e.g., inter-cell) downlink sTRP and uplink mTRP deployment (e.g., when a UE 115 is configured with SSB-MTC-additionalPCIs) , a serving cell 205 may be configured with two or more TAGs. In such examples, the UE 115 may support two or more downlink reference timings and two or more TA offsets, where each downlink reference timing and each TA offset may be associated with a given TAG. In some examples, the UE 115 may apply one of the two or more downlink reference timings and / or one of the two or more TA offsets for a PDCCH ordered PRACH message (e.g., may transmit the PRACH message in accordance with one of the timing parameters) .
[0172] In some examples, the UE 115 may receive control signaling from one or more of the TRPs that indicates one or more identifiers of one or more TAGs, one or more TA offsets, or both. For example, a first TAG may be configured by a first parameter (e.g., Tag-Id) and associated with a serving cell PCI, and the second TAG may be configured by a second parameter (e.g., Tag2-Id) and associated with an additional PCI (e.g., an active additional PCI, a non-serving cell PCI) . In another example, a first TA offset may be configured by a first parameter (e.g., n-TimingAdvanceOffset) and applied to a first TAG, and the second TA offset may be configured by a second parameter (e.g., n-TimingAdvanceOffset2) and applied to a second TAG.
[0173] In some examples, the network (e.g., the TRPs, a network entity 105 associated with the TRPs) may use a field (e.g., a one-bit field, a DCI field) of a control message (e.g., a DCI message, the PDCCH order DCI message) to indicate which downlink reference timing or which TA offset the UE 115 is to use (e.g., apply) for transmitting a random access message (e.g., a PRACH message, a PDCCH ordered PRACH) . Various examples herein may describe such control message field aspects using a DCI field example. However, other mechanisms for the indication may be used, such as fields of different control signaling types (e.g., MAC-CE, RRC, or other mechanisms) . In some examples, one or more new DCI fields (e.g., a downlink reference timing offset field or a TA offset field) may be added to a DCI message (e.g., a DCI format) for the indication. Additionally, or alternatively, an existing DCI field (e.g., a PL offset field, PRACH association indicator field, or other one-bit field) may be reused for the indication. In some examples, a restriction that PRACH association indicator is present when two CORESETPoolIndex values are configured may be removed to support the indication (e.g., when a PRACH association indicator field is reused) . In some examples, a restriction that the PL offset field is present when at least one TCI state is configured with PL offset may be removed to support the indication (e.g., when a PL offset field is reused) . In some examples, a same DCI field may be used for both downlink reference timing indication and for TA offset indication.
[0174] The UE 115 may interpret the DCI field (e.g., of the PDCCH order DCI) in accordance with various techniques herein described with reference to FIGs. 3–6. For example, the UE 115 may determine one or more timing parameters based on a value (e.g., 0, 1, or some other value) of the DCI field, one or more PCIs, one or more TCI states (e.g., uplink TCI states, TCI state associations) , or any combination thereof. Although described separately, the DCI interpretation techniques herein, or portions thereof, may be implemented by a UE 115 or another device in various combinations.
[0175] In accordance with aspects of the present disclosure, FIGs. 3–6 show and describe different options for identifying timing parameters (e.g., downlink reference timing, TA offset) that are to be used for communications with multiple TRPs associated with different TAGs, such as in Scenario 1 and Scenario 2 illustrated in FIG. 2.
[0176] FIG. 3 shows an example of a process flow 300 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The process flow 300 may be implemented by a UE 115 such as the UE 115-a or the UE 115-b as described with reference to FIG. 2. The UE 115 may implement aspects of the process flow 300 to interpret a DCI field for determining one or more timing parameters for a random access procedure in a inter-cell scenario, such as Scenario 1 or Scenario 2 illustrated in FIG. 2. The process flow 300 may be an example of a first option (Option 1) for interpreting a DCI value. In some examples, a UE 115 may implement the process flow 300 for sTRP operation or mTRP operation.
[0177] The various steps and operations shown and descried in FIG. 3 may be performed by a UE 115 operating in an asymmetric downlink and uplink scenario, such as Scenario 1 and / or Scenario 2 illustrated in FIG. 2. In particular, steps / operations shown and described in FIG. 3 may be performed by a UE 115 that is communicatively coupled with a downlink TRP (e.g., a TRP that can transmit downlink data and control information) associated with a first TAG, and an uplink TRP (e.g., a TRP that can receive uplink data, but can only transmit downlink reference signals) associated with a second TAG. In these scenarios, FIG. 3 illustrates a first option (Option 1) for determining timing parameters (e.g., downlink reference timing, TA offset) for communicating with the downlink TRP and the uplink TRP associated with different TAGs.
[0178] At signaling operation 305, the UE 115 may receive (e.g., a network entity 105 may output via a downlink TRP 220) a DCI message that includes a one-bit indicator field (e.g., or multi-bit indicator field) associated with a downlink reference timing, a TA offset, or both. The DCI message may be associated with a PDCCH order DCI message. A “PDCCH order DCI message” may refer to a control message that triggers (e.g., instructs, indicates) the UE 115 to perform one or more operations, such as initiating a PRACH procedure. The PDDCH order DCI message may also include one or more parameters that the UE 115 uses for performing the one or more operations (e.g., timing parameters, resource allocation parameters, or other parameters) . In some examples, the one-bit indicator field may include a PRACH downlink reference timing field, a TA offset field, a PL offset indicator field, or a PRACH association indicator field.
[0179] At operation 310, the UE 115 may determine (e.g., interpret) a value of the DCI field. If the DCI field is set to a first value (e.g., 0) , the UE 115 may proceed to processing operation 315. If the DCI field is set to a second value (e.g., 1) , the UE 115 may proceed to processing operation 325.
[0180] In some examples, the UE 115 may perform processing operation 315, the processing operation 320, or both. At processing operation 315, the UE 115 may determine that the downlink reference timing is (e.g., corresponds to) a first detected path (e.g., in time) of one of the corresponding downlink reference signals of downlink TCI state (s) of a reference cell associated with a first TAG (e.g., associated with a serving cell PCI) . At processing operation 320, the UE 115 may determine to use a first TA offset (e.g., n-TimingAdvanceOffset) associated with the first TAG.
[0181] In some examples, the UE 115 may perform the processing operation 325, the processing operation 330, or both. At processing operation 325, the UE 115 may determine that the downlink reference timing is (e.g., corresponds to) a first detected path (e.g., in time) of one of the corresponding downlink reference signals of downlink TCI state (s) of a reference cell associated with a second TAG (e.g., associated with an active additional PCI) . At processing operation 330, the UE 115 may determine to use a second TA offset (e.g., n-TimingAdvanceOffset2) associated with the second TAG.
[0182] At signaling operation 335, the UE 115 may transmit (e.g., a network entity may obtain via one or more TRPs) a PRACH message to a downlink TRP 220 or an uplink TRP 215 in accordance with the determined downlink reference timing, the TA offset, or both.
[0183] FIG. 4 shows an example of a process flow 400 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The process flow 400 may be implemented by a UE 115 such as the UE 115-aas described with reference to FIG. 2. The UE 115 may implement aspects of the process flow 400 to interpret a DCI field for determining one or more timing parameters for a random access procedure in a inter-cell scenario, such as Scenario 1. The process flow 400 may be an example of a second option (Option 2) for interpreting a DCI value. In some examples, a UE 115 may implement the process flow 400 for sTRP operation (e.g., when one joint or uplink TCI state is indicated) .
[0184] The various steps and operations shown and descried in FIG. 4 may be performed by a UE 115 operating in an asymmetric downlink and uplink scenario, such as Scenario 1 illustrated in FIG. 2. In particular, steps / operations shown and described in FIG. 4 may be performed by a UE 115 that is communicatively coupled with a downlink TRP (e.g., a TRP that can transmit downlink data and control information) associated with a first TAG, and an uplink TRP (e.g., a TRP that can receive uplink data, but can only transmit downlink reference signals) associated with a second TAG. In these scenarios, FIG. 4 illustrates a second option (Option 2) for determining timing parameters (e.g., downlink reference timing, TA offset) for communicating with the downlink TRP and the uplink TRP associated with different TAGs.
[0185] At signaling operation 405, the UE 115 may receive a DCI message that includes a one-bit indicator field (e.g., or a field with some other quantity of bits) associated with a downlink reference timing, a TA offset, or both (e.g., and in accordance with aspects described at signaling operation 305 of FIG. 3) .
[0186] At operation 410, the UE 115 may determine (e.g., interpret) a value of the DCI field. If the DCI field is set to a first value (e.g., 0) , the UE 115 may proceed to processing operation 415. If the DCI field is set to a second value (e.g., 1) , the UE 115 may proceed to operation 425.
[0187] At operation 425, in a first implementation (e.g., Option 2–1) , the UE 115 may determine the downlink reference timing, the TA offset, or both based on whether an indicated joint or uplink TCI state is associated with a serving cell PCI or an additional PCI. If the indicated joint or uplink TCI state is associated with the serving cell PCI, the UE 115 may proceed to processing operation 415. If the indicated joint or uplink TCI state is associated with the additional PCI, the UE 115 may proceed to processing operation 430.
[0188] At operation 425, in a second implementation (e.g., Option 2–2) , the UE 115 may determine the downlink reference timing, the TA offset, or both based on whether the indicated joint or uplink TCI state is associated with the first TAG (e.g., Tag-Id) or the second TAG (e.g., Tag2-Id) . If the indicated joint or uplink TCI state is associated with the first TAG, the UE 115 may proceed to processing operation 415. If the indicated joint or uplink TCI state is associated with the second TAG, the UE 115 may proceed to processing operation 430.
[0189] In some examples, the UE 115 may perform the processing operation 415, the processing operation 420, or both. At processing operation 415, the UE 115 may determine that the downlink reference timing is (e.g., corresponds to) a first detected path (e.g., in time) of one of the corresponding downlink reference signals of downlink TCI state (s) of a reference cell associated with a first TAG (e.g., associated with a serving cell PCI) . At processing operation 420, the UE 115 may determine to use a first TA offset (e.g., n-TimingAdvanceOffset) associated with the first TAG.
[0190] In some examples, the UE 115 may perform the processing operation 430, the processing operation 435, or both. At processing operation 430, the UE 115 may determine that the downlink reference timing is (e.g., corresponds to) a first detected path (e.g., in time) of one of the corresponding downlink reference signals of downlink TCI state (s) of a reference cell associated with a second TAG (e.g., associated with an active additional PCI) . At processing operation 435, the UE 115 may determine to use a second TA offset (e.g., n-TimingAdvanceOffset2) associated with the second TAG.
[0191] At signaling operation 440, the UE 115 may transmit (e.g., a network entity may obtain via one or more TRPs) a PRACH message to a downlink TRP 220 or an uplink TRP 215 in accordance with the determined downlink reference timing, TA offset, or both.
[0192] FIG. 5 shows an example of a process flow 500 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The process flow 500 may be implemented by a UE 115 such as the UE 115-aas described with reference to FIG. 2. The UE 115 may implement aspects of the process flow 500 to interpret a DCI field for determining one or more timing parameters for a random access procedure in a inter-cell scenario, such as Scenario 1. The process flow 500 may be an example of a third option (Option 3) for interpreting a DCI value. In some examples, a UE 115 may implement the process flow 500 for mTRP operation (e.g., when two joint or uplink TCI states are indicated) .
[0193] The various steps and operations shown and descried in FIG. 5 may be performed by a UE 115 operating in an asymmetric downlink and uplink scenario, such as Scenario 1 illustrated in FIG. 2. In particular, steps / operations shown and described in FIG. 5 may be performed by a UE 115 that is communicatively coupled with a downlink TRP (e.g., a TRP that can transmit downlink data and control information) associated with a first TAG, and an uplink TRP (e.g., a TRP that can receive uplink data, but can only transmit downlink reference signals) associated with a second TAG. In these scenarios, FIG. 5 illustrates a third option (Option 3) for determining timing parameters (e.g., downlink reference timing, TA offset) for communicating with the downlink TRP and the uplink TRP associated with different TAGs.
[0194] At signaling operation 505, the UE 115 may receive (e.g., be indicated with, from a network entity 105 via a TRP) a first TCI state (e.g., a first joint TCI state, a first uplink TCI state) and a second TCI state (e.g., a second joint TCI state, a second uplink TCI state) .
[0195] At signaling operation 510, the UE 115 may receive a DCI message that includes a one-bit indicator field (e.g., or a field with some other quantity of bits) associated with a downlink reference timing, a TA offset, or both (e.g., and in accordance with aspects described at signaling operation 305 of FIG. 3) .
[0196] At operation 515, the UE 115 may determine (e.g., interpret) a value of the DCI field. If the DCI field is set to a first value (e.g., 0) , the UE 115 may proceed to operation 520. If the DCI field is set to a second value (e.g., 1) , the UE 115 may proceed to operation 535.
[0197] At operation 520, in a first implementation (e.g., Option 3–1) , the UE 115 may determine the downlink reference timing, the TA offset, or both based on whether the first indicated joint is associated with a serving cell PCI or an additional PCI. If the first indicated joint or uplink TCI state is associated with the serving cell PCI, the UE 115 may proceed to processing operation 525. If the first indicated joint or uplink TCI state is associated with the additional PCI, the UE 115 may proceed to processing operation 540.
[0198] At operation 535, in the first implementation (e.g., Option 3–1) , the UE 115 may determine the downlink reference timing, the TA offset, or both based on whether the second indicated joint or uplink TCI state is associated with a serving cell PCI or an additional PCI. If the second indicated joint or uplink TCI state is associated with the serving cell PCI, the UE 115 may proceed to processing operation 525. If the second indicated joint or uplink TCI state is associated with the additional PCI, the UE 115 may proceed to processing operation 540.
[0199] At operation 520, in a second implementation (e.g., Option 3–2) , the UE 115 may determine the downlink reference timing, the TA offset, or both based on whether the first indicated joint is associated with the first TAG (e.g., Tag-Id) or the second TAG (e.g., Tag2-Id) . If the first indicated joint or uplink TCI state is associated with the first TAG, the UE 115 may proceed to processing operation 525. If the first indicated joint or uplink TCI state is associated with the second TAG, the UE 115 may proceed to processing operation 540.
[0200] At operation 535, in a second implementation (e.g., Option 3–2) , the UE 115 may determine the downlink reference timing, the TA offset, or both based on whether the second indicated joint is associated with the first TAG (e.g., Tag-Id) or the second TAG (e.g., Tag2-Id) . If the second indicated joint or uplink TCI state is associated with the first TAG, the UE 115 may proceed to processing operation 525. If the second indicated joint or uplink TCI state is associated with the second TAG, the UE 115 may proceed to processing operation 540.
[0201] In some examples, the UE 115 may perform the processing operation 525, the processing operation 530, or both. At processing operation 525, the UE 115 may determine that the downlink reference timing is (e.g., corresponds to) a first detected path (e.g., in time) of one of the corresponding downlink reference signals of downlink TCI state (s) of a reference cell associated with a first TAG (e.g., associated with a serving cell PCI) . At processing operation 530, the UE 115 may determine to use a first TA offset (e.g., n-TimingAdvanceOffset) associated with the first TAG.
[0202] In some examples, the UE 115 may perform the processing operation 540, the processing operation 545, or both. At processing operation 540, the UE 115 may determine that the downlink reference timing is (e.g., corresponds to) a first detected path (e.g., in time) of one of the corresponding downlink reference signals of downlink TCI state (s) of a reference cell associated with a second TAG (e.g., associated with an active additional PCI) . At processing operation 545, the UE 115 may determine to use a second TA offset (e.g., n-TimingAdvanceOffset2) associated with the second TAG.
[0203] At signaling operation 550, the UE 115 may transmit (e.g., a network entity may obtain via one or more TRPs) a PRACH message to a downlink TRP 220 or an uplink TRP 215 in accordance with the determined downlink reference timing, TA offset, or both.
[0204] FIG. 6 shows an example of a process flow 600 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The process flow 600 may be implemented by a UE 115 such as the UE 115-aas described with reference to FIG. 2. The UE 115 may implement aspects of the process flow 600 to interpret a DCI field for determining one or more timing parameters for a random access procedure in a intra-cell scenario. The process flow 600 may be an example of a fourth option (Option 4) for interpreting a DCI value. In some examples, a UE 115 may implement the process flow 600 for sTRP operation or mTRP operation.
[0205] The various steps and operations shown and described in FIG. 6 may be performed by a UE 115 operating in an asymmetric downlink and uplink scenario, such as Scenario 1 illustrated in FIG. 2. In particular, steps / operations shown and described in FIG. 6 may be performed by a UE 115 that is communicatively coupled with a downlink TRP (e.g., a TRP that can transmit downlink data and control information) associated with a first TAG, and an uplink TRP (e.g., a TRP that can receive uplink data, but can only transmit downlink reference signals) associated with a second TAG. In these scenarios, FIG. 6 illustrates a fourth option (Option 4) for determining timing parameters (e.g., downlink reference timing, TA offset) for communicating with the downlink TRP and the uplink TRP associated with different TAGs.
[0206] In some examples, the process flow 600 may support an extension of one or more inter-cell techniques described herein to an intra-cell asymmetric downlink / uplink scenario (e.g., where the uplink TRPs 215 have limited downlink transmission function) . In such examples, a first TAG may be configured by Tag-Id (e.g., a first RRC parameter, configured by a network entity 105) and the second TAG is configured by Tag2-Id (e.g., a second RRC parameter, configured by a network entity 105) . The first TAG and the second TAG may both be applicable (e.g., may be applied) to a serving cell 205.
[0207] At signaling operation 605, the UE 115 may receive a DCI message that includes a one-bit indicator field (e.g., or a field with some other quantity of bits) associated with a downlink reference timing, a TA offset, or both (e.g., and in accordance with aspects described at 305 of FIG. 3) . After signaling operation 605, other options (e.g., Option 1, Option 2–2, Option 3–2) may be applied to indicate downlink reference timing, TA offset, or both for PDCCH ordered PRACH for an intra-cell scenario. Additionally, or alternatively, the UE 115 may utilize the subsequent operations of the process flow 600 to interpret the one-bit DCI field for an intra-cell scenario.
[0208] At operation 610, the UE 115 may determine (e.g., interpret) a value of the DCI field. If the DCI field is set to a first value (e.g., 0) , the UE 115 may proceed to processing operation 615. If the DCI field is set to a second value (e.g., 1) , the UE 115 may proceed to processing operation 625.
[0209] In some examples, the UE 115 may perform the processing operation 615, the processing operation 620, or both in response to DCI field value being the first value. At processing operation 615, the UE 115 may determine that the downlink reference timing is (e.g., corresponds to) a first detected path (e.g., in time) of one of the corresponding downlink reference signals of downlink TCI state (s) of a reference cell associated with a TAG (e.g., the first TAG or the second TAG) that is associated with a TCI state of the CORESET associated with a Type-1 PDCCH CSS. At processing operation 620, the UE 115 may determine to use a TA offset associated with the TAG that is associated with a TCI state of the CORESET associated with a Type-1 PDCCH CSS.
[0210] In some examples, the UE 115 may perform the processing operation 625, the processing operation 630, or both in response to DCI field value being the second value. At processing operation 625, the UE 115 may determine that the downlink reference timing is (e.g., corresponds to) a first detected path (e.g., in time) of one of the corresponding downlink reference signals of downlink TCI state (s) of a reference cell associated with another TAG different than the TAG (e.g., a different TAG than the TAG used in processing operation 615) associated with the TCI state of the CORESET associated with the Type-1 PDCCH CSS. At processing operation 630, the UE 115 may determine to use a TA offset associated with the other TAG different than the TAG associated with the TCI state of the CORESET associated with the Type-1 PDCCH CSS.
[0211] At signaling operation 635, the UE 115 may transmit (e.g., a network entity may obtain via one or more TRPs) a PRACH message to a downlink TRP 220 or an uplink TRP 215 in accordance with the determined downlink reference timing, TA offset, or both.
[0212] FIG. 7 shows a block diagram 700 of a device 705 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The device 705 may be an example of aspects of a UE 115 as described herein. The device 705 may include a receiver 710, a transmitter 715, and a communications manager 720. The device 705, or one or more components of the device 705 (e.g., the receiver 710, the transmitter 715, the communications manager 720) , may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0213] The receiver 710 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to timing parameter determination in asymmetric communication scenarios) . Information may be passed on to other components of the device 705. The receiver 710 may utilize a single antenna or a set of multiple antennas.
[0214] The transmitter 715 may provide a means for transmitting signals generated by other components of the device 705. For example, the transmitter 715 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to timing parameter determination in asymmetric communication scenarios) . In some examples, the transmitter 715 may be co-located with a receiver 710 in a transceiver module. The transmitter 715 may utilize a single antenna or a set of multiple antennas.
[0215] The communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be examples of means for performing various aspects of timing parameter determination in asymmetric communication scenarios as described herein. For example, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be capable of performing one or more of the functions described herein.
[0216] In some examples, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include at least one of a processor, a digital signal processor (DSP) , a central processing unit (CPU) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory) .
[0217] Additionally, or alternatively, the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor (e.g., referred to as a processor-executable code) . If implemented in code executed by at least one processor, the functions of the communications manager 720, the receiver 710, the transmitter 715, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure) .
[0218] In some examples, the communications manager 720 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 710, the transmitter 715, or both. For example, the communications manager 720 may receive information from the receiver 710, send information to the transmitter 715, or be integrated in combination with the receiver 710, the transmitter 715, or both to obtain information, output information, or perform various other operations as described herein.
[0219] The communications manager 720 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 720 is capable of, configured to, or operable to support a means for communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The communications manager 720 is capable of, configured to, or operable to support a means for receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing. The communications manager 720 is capable of, configured to, or operable to support a means for receiving a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG. The communications manager 720 is capable of, configured to, or operable to support a means for transmitting a PRACH message to the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based on a value of the one-bit indicator field.
[0220] Additionally, or alternatively, the communications manager 720 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 720 is capable of, configured to, or operable to support a means for communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The communications manager 720 is capable of, configured to, or operable to support a means for receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a TA offset. The communications manager 720 is capable of, configured to, or operable to support a means for transmitting a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0221] By including or configuring the communications manager 720 in accordance with examples as described herein, the device 705 (e.g., at least one processor controlling or otherwise coupled with the receiver 710, the transmitter 715, the communications manager 720, or a combination thereof) may support techniques for more efficient utilization of communication resources and reduced processing overhead, among other benefits.
[0222] FIG. 8 shows a block diagram 800 of a device 805 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The device 805 may be an example of aspects of a device 705 or a UE 115 as described herein. The device 805 may include a receiver 810, a transmitter 815, and a communications manager 820. The device 805, or one or more components of the device 805 (e.g., the receiver 810, the transmitter 815, the communications manager 820) , may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0223] The receiver 810 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to timing parameter determination in asymmetric communication scenarios) . Information may be passed on to other components of the device 805. The receiver 810 may utilize a single antenna or a set of multiple antennas.
[0224] The transmitter 815 may provide a means for transmitting signals generated by other components of the device 805. For example, the transmitter 815 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to timing parameter determination in asymmetric communication scenarios) . In some examples, the transmitter 815 may be co-located with a receiver 810 in a transceiver module. The transmitter 815 may utilize a single antenna or a set of multiple antennas.
[0225] The device 805, or various components thereof, may be an example of means for performing various aspects of timing parameter determination in asymmetric communication scenarios as described herein. For example, the communications manager 820 may include an TRP communication component 825, a control information component 830, a downlink reference signal component 835, a random access message component 840, a TA offset component 845, or any combination thereof. The communications manager 820 may be an example of aspects of a communications manager 720 as described herein. In some examples, the communications manager 820, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 810, the transmitter 815, or both. For example, the communications manager 820 may receive information from the receiver 810, send information to the transmitter 815, or be integrated in combination with the receiver 810, the transmitter 815, or both to obtain information, output information, or perform various other operations as described herein.
[0226] The communications manager 820 may support wireless communications in accordance with examples as disclosed herein. The TRP communication component 825 is capable of, configured to, or operable to support a means for communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The control information component 830 is capable of, configured to, or operable to support a means for receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing. The downlink reference signal component 835 is capable of, configured to, or operable to support a means for receiving a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG. The random access message component 840 is capable of, configured to, or operable to support a means for transmitting a PRACH message to the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based on a value of the one-bit indicator field.
[0227] Additionally, or alternatively, the communications manager 820 may support wireless communications in accordance with examples as disclosed herein. The TRP communication component 825 is capable of, configured to, or operable to support a means for communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The TA offset component 845 is capable of, configured to, or operable to support a means for receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a TA offset. The random access message component 840 is capable of, configured to, or operable to support a means for transmitting a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0228] FIG. 9 shows a block diagram 900 of a communications manager 920 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The communications manager 920 may be an example of aspects of a communications manager 720, a communications manager 820, or both, as described herein. The communications manager 920, or various components thereof, may be an example of means for performing various aspects of timing parameter determination in asymmetric communication scenarios as described herein. For example, the communications manager 920 may include an TRP communication component 925, a control information component 930, a downlink reference signal component 935, a random access message component 940, a TA offset component 945, an SSB component 950, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or more processors, one or more memories) , may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
[0229] The communications manager 920 may support wireless communications in accordance with examples as disclosed herein. The TRP communication component 925 is capable of, configured to, or operable to support a means for communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The control information component 930 is capable of, configured to, or operable to support a means for receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing. The downlink reference signal component 935 is capable of, configured to, or operable to support a means for receiving a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG. The random access message component 940 is capable of, configured to, or operable to support a means for transmitting a PRACH message to the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based on a value of the one-bit indicator field.
[0230] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value. In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including a second value.
[0231] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with a serving cell PCI. In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0232] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with the first TAG. In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with the second TAG.
[0233] In some examples, the UE is indicated with a first indicated TCI state and a second indicated TCI state. In some examples, the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including a first value and based on the first indicated TCI state. In some examples, the downlink reference timing is determined based on the value of the one-bit indicator field including a second value and based on the second indicated TCI state.
[0234] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the first value and based on the first indicated TCI state being associated with a serving cell PCI.
[0235] In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on value of the one-bit indicator field including the first value and based on the first indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0236] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second indicated TCI state being associated with a serving cell PCI.
[0237] In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0238] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the first value and based on the first indicated TCI state being associated with the first TAG.
[0239] In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the first value and based on the first indicated TCI state being associated with the second TAG.
[0240] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second indicated TCI state being associated with the first TAG.
[0241] In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second indicated TCI state being associated with the second TAG.
[0242] In some examples, the first TRP and the second TRP are associated with a same cell. In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value. In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including a second value.
[0243] In some examples, the first TAG is associated with a TCI state of a CORESET that is associated with a Type-1 PDCCH CSS.
[0244] In some examples, the one-bit indicator field includes a PRACH downlink reference timing field, a PL offset indicator field, or a PRACH association indicator field.
[0245] In some examples, the SSB component 950 is capable of, configured to, or operable to support a means for receiving a first set of SSBs from the first TRP and a second set of SSBs from the second TRP, where the first set of SSBs are associated with a serving cell PCI and the second set of SSBs are associated with a non-serving cell PCI.
[0246] In some examples, the DCI message is associated with a PDCCH order DCI. In some examples, transmitting the PRACH message to the first TRP or the second TRP is based on the PDCCH order DCI.
[0247] In some examples, the control information component 930 is capable of, configured to, or operable to support a means for receiving control signaling that indicates a first identifier of the first TAG that is associated with a serving cell PCI, a second identifier of the second TAG that is associated with a non-serving cell PCI, or both.
[0248] In some examples, the downlink reference timing includes a timing associated with a first detected path in a time domain of either one of the first set of downlink reference signals or one of the second set of downlink reference signals.
[0249] Additionally, or alternatively, the communications manager 920 may support wireless communications in accordance with examples as disclosed herein. In some examples, the TRP communication component 925 is capable of, configured to, or operable to support a means for communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The TA offset component 945 is capable of, configured to, or operable to support a means for receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a TA offset. In some examples, the random access message component 940 is capable of, configured to, or operable to support a means for transmitting a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0250] In some examples, the TA offset is determined based on the value of the one-bit indicator field including a first value. In some examples, the TA offset is determined based on the value of the one-bit indicator field including a second value.
[0251] In some examples, the TA offset is determined based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with a serving cell PCI. In some examples, the TA offset is determined based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0252] In some examples, the TA offset is determined based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with the first TAG. In some examples, the TA offset is determined based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with the second TAG.
[0253] In some examples, the UE is indicated with a first TCI state and a second TCI state. In some examples, the TA offset is determined based on the value of the one-bit indicator field including a first value and based on the first TCI state. In some examples, the TA offset is determined based on the value of the one-bit indicator field including a second value and based on the second TCI state.
[0254] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with a serving cell PCI.
[0255] In some examples, the TA offset is determined based on value of the one-bit indicator field including the first value and based on the first TCI state being associated with a non-serving cell PCI or an additional PCI.
[0256] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with a serving cell PCI.
[0257] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with a non-serving cell PCI or an additional PCI.
[0258] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with the first TAG.
[0259] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with the second TAG.
[0260] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with the first TAG.
[0261] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with the second TAG.
[0262] In some examples, the first TRP and the second TRP are associated with a same cell. In some examples, the TA offset is determined based on the value of the one-bit indicator field including a first value. In some examples, the TA offset is determined based on the value of the one-bit indicator field including a second value.
[0263] In some examples, the first TAG is associated with a TCI state of a CORESET that is associated with a Type-1 PDCCH CSS.
[0264] In some examples, the one-bit indicator field includes a TA offset field, a PL offset indicator field, or a PRACH association indicator field.
[0265] In some examples, the SSB component 950 is capable of, configured to, or operable to support a means for receiving a first set of SSBs from the first TRP and a second set of SSBs from the second TRP, where the first set of SSBs are associated with a serving cell PCI and the second set of SSBs are associated with a non-serving cell PCI.
[0266] In some examples, the DCI message is associated with a PDCCH order DCI. In some examples, transmitting the PRACH message to the first TRP or the second TRP is based on the PDCCH order DCI.
[0267] In some examples, the control information component 930 is capable of, configured to, or operable to support a means for receiving control signaling that indicates a first TA offset associated with the first TAG, a second TA offset associated with the second TAG, or both, where the TA offset is determined as either the first TA offset or the second TA offset based on the value of the one-bit indicator field.
[0268] FIG. 10 shows a diagram of a system 1000 including a device 1005 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The device 1005 may be an example of or include components of a device 705, a device 805, or a UE 115 as described herein. The device 1005 may communicate (e.g., wirelessly) with one or more other devices (e.g., network entities 105, UEs 115, or a combination thereof) . The device 1005 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager 1020, an input / output (I / O) controller, such as an I / O controller 1010, a transceiver 1015, one or more antennas 1025, at least one memory 1030, code 1035, and at least one processor 1040. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1045) .
[0269] The I / O controller 1010 may manage input and output signals for the device 1005. The I / O controller 1010 may also manage peripherals not integrated into the device 1005. In some cases, the I / O controller 1010 may represent a physical connection or port to an external peripheral. In some cases, the I / O controller 1010 may utilize an operating system such as or another known operating system. Additionally, or alternatively, the I / O controller 1010 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I / O controller 1010 may be implemented as part of one or more processors, such as the at least one processor 1040. In some cases, a user may interact with the device 1005 via the I / O controller 1010 or via hardware components controlled by the I / O controller 1010.
[0270] In some cases, the device 1005 may include a single antenna. However, in some other cases, the device 1005 may have more than one antenna, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 1015 may communicate bi-directionally via the one or more antennas 1025 using wired or wireless links as described herein. For example, the transceiver 1015 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1015 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 1025 for transmission, and to demodulate packets received from the one or more antennas 1025. The transceiver 1015, or the transceiver 1015 and one or more antennas 1025, may be an example of a transmitter 715, a transmitter 815, a receiver 710, a receiver 810, or any combination thereof or component thereof, as described herein.
[0271] The at least one memory 1030 may include random access memory (RAM) and read-only memory (ROM) . The at least one memory 1030 may store computer-readable, computer-executable, or processor-executable code, such as the code 1035. The code 1035 may include instructions that, when executed by the at least one processor 1040, cause the device 1005 to perform various functions described herein. The code 1035 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 1035 may not be directly executable by the at least one processor 1040 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 1030 may include, among other things, a basic I / O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
[0272] The at least one processor 1040 may include one or more intelligent hardware devices (e.g., one or more general-purpose processors, one or more DSPs, one or more CPUs, one or more graphics processing units (GPUs) , one or more neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , one or more microcontrollers, one or more ASICs, one or more FPGAs, one or more programmable logic devices, discrete gate or transistor logic, one or more discrete hardware components, or any combination thereof) . In some cases, the at least one processor 1040 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the at least one processor 1040. The at least one processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., the at least one memory 1030) to cause the device 1005 to perform various functions (e.g., functions or tasks supporting timing parameter determination in asymmetric communication scenarios) . For example, the device 1005 or a component of the device 1005 may include at least one processor 1040 and at least one memory 1030 coupled with or to the at least one processor 1040, the at least one processor 1040 and the at least one memory 1030 configured to perform various functions described herein.
[0273] In some examples, the at least one processor 1040 may include multiple processors and the at least one memory 1030 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions described herein. In some examples, the at least one processor 1040 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 1040) and memory circuitry (which may include the at least one memory 1030) ) , or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. For example, the at least one processor 1040 or a processing system including the at least one processor 1040 may be configured to, configurable to, or operable to cause the device 1005 to perform one or more of the functions described herein. Further, as described herein, being “configured to, ” being “configurable to, ” and being “operable to”may be used interchangeably and may be associated with a capability, when executing code 1035 (e.g., processor-executable code) stored in the at least one memory 1030 or otherwise, to perform one or more of the functions described herein.
[0274] The communications manager 1020 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1020 is capable of, configured to, or operable to support a means for communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The communications manager 1020 is capable of, configured to, or operable to support a means for receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing. The communications manager 1020 is capable of, configured to, or operable to support a means for receiving a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG. The communications manager 1020 is capable of, configured to, or operable to support a means for transmitting a PRACH message to the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based on a value of the one-bit indicator field.
[0275] Additionally, or alternatively, the communications manager 1020 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1020 is capable of, configured to, or operable to support a means for communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The communications manager 1020 is capable of, configured to, or operable to support a means for receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a TA offset. The communications manager 1020 is capable of, configured to, or operable to support a means for transmitting a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0276] By including or configuring the communications manager 1020 in accordance with examples as described herein, the device 1005 may support techniques for improved communication reliability, reduced latency, more efficient utilization of communication resources, and improved coordination between devices, among other benefits.
[0277] In some examples, the communications manager 1020 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver 1015, the one or more antennas 1025, or any combination thereof. Although the communications manager 1020 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 1020 may be supported by or performed by the at least one processor 1040, the at least one memory 1030, the code 1035, or any combination thereof. For example, the code 1035 may include instructions executable by the at least one processor 1040 to cause the device 1005 to perform various aspects of timing parameter determination in asymmetric communication scenarios as described herein, or the at least one processor 1040 and the at least one memory 1030 may be otherwise configured to, individually or collectively, perform or support such operations.
[0278] FIG. 11 shows a block diagram 1100 of a device 1105 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The device 1105 may be an example of aspects of a network entity 105 as described herein. The device 1105 may include a receiver 1110, a transmitter 1115, and a communications manager 1120. The device 1105, or one or more components of the device 1105 (e.g., the receiver 1110, the transmitter 1115, the communications manager 1120) , may include at least one processor, which may be coupled with at least one memory, to, individually or collectively, support or enable the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0279] The receiver 1110 may provide a means for obtaining (e.g., receiving, determining, identifying) information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) . Information may be passed on to other components of the device 1105. In some examples, the receiver 1110 may support obtaining information by receiving signals via one or more antennas. Additionally, or alternatively, the receiver 1110 may support obtaining information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.
[0280] The transmitter 1115 may provide a means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 1105. For example, the transmitter 1115 may output information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) . In some examples, the transmitter 1115 may support outputting information by transmitting signals via one or more antennas. Additionally, or alternatively, the transmitter 1115 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 1115 and the receiver 1110 may be co-located in a transceiver, which may include or be coupled with a modem.
[0281] The communications manager 1120, the receiver 1110, the transmitter 1115, or various combinations or components thereof may be examples of means for performing various aspects of timing parameter determination in asymmetric communication scenarios as described herein. For example, the communications manager 1120, the receiver 1110, the transmitter 1115, or various combinations or components thereof may be capable of performing one or more of the functions described herein.
[0282] In some examples, the communications manager 1120, the receiver 1110, the transmitter 1115, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include at least one of a processor, a DSP, a CPU, an ASIC, an FPGA or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory) .
[0283] Additionally, or alternatively, the communications manager 1120, the receiver 1110, the transmitter 1115, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor (e.g., referred to as a processor-executable code) . If implemented in code executed by at least one processor, the functions of the communications manager 1120, the receiver 1110, the transmitter 1115, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure) .
[0284] In some examples, the communications manager 1120 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 1110, the transmitter 1115, or both. For example, the communications manager 1120 may receive information from the receiver 1110, send information to the transmitter 1115, or be integrated in combination with the receiver 1110, the transmitter 1115, or both to obtain information, output information, or perform various other operations as described herein.
[0285] The communications manager 1120 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1120 is capable of, configured to, or operable to support a means for communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The communications manager 1120 is capable of, configured to, or operable to support a means for outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing. The communications manager 1120 is capable of, configured to, or operable to support a means for outputting a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG. The communications manager 1120 is capable of, configured to, or operable to support a means for obtaining a PRACH message from the UE via the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on a value of the one-bit indicator field.
[0286] Additionally, or alternatively, the communications manager 1120 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1120 is capable of, configured to, or operable to support a means for communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The communications manager 1120 is capable of, configured to, or operable to support a means for outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a TA offset. The communications manager 1120 is capable of, configured to, or operable to support a means for obtaining a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0287] By including or configuring the communications manager 1120 in accordance with examples as described herein, the device 1105 (e.g., at least one processor controlling or otherwise coupled with the receiver 1110, the transmitter 1115, the communications manager 1120, or a combination thereof) may support techniques for more efficient utilization of communication resources and reduced processing overhead, among other benefits.
[0288] FIG. 12 shows a block diagram 1200 of a device 1205 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The device 1205 may be an example of aspects of a device 1105 or a network entity 105 as described herein. The device 1205 may include a receiver 1210, a transmitter 1215, and a communications manager 1220. The device 1205, or one or more components of the device 1205 (e.g., the receiver 1210, the transmitter 1215, the communications manager 1220) , may include at least one processor, which may be coupled with at least one memory, to support the described techniques. Each of these components may be in communication with one another (e.g., via one or more buses) .
[0289] The receiver 1210 may provide a means for obtaining (e.g., receiving, determining, identifying) information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) . Information may be passed on to other components of the device 1205. In some examples, the receiver 1210 may support obtaining information by receiving signals via one or more antennas. Additionally, or alternatively, the receiver 1210 may support obtaining information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.
[0290] The transmitter 1215 may provide a means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 1205. For example, the transmitter 1215 may output information such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) . In some examples, the transmitter 1215 may support outputting information by transmitting signals via one or more antennas. Additionally, or alternatively, the transmitter 1215 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 1215 and the receiver 1210 may be co-located in a transceiver, which may include or be coupled with a modem.
[0291] The device 1205, or various components thereof, may be an example of means for performing various aspects of timing parameter determination in asymmetric communication scenarios as described herein. For example, the communications manager 1220 may include an TRP communication manager 1225, a control information manager 1230, a downlink reference signal manager 1235, a random access message manager 1240, a TA offset manager 1245, or any combination thereof. The communications manager 1220 may be an example of aspects of a communications manager 1120 as described herein. In some examples, the communications manager 1220, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 1210, the transmitter 1215, or both. For example, the communications manager 1220 may receive information from the receiver 1210, send information to the transmitter 1215, or be integrated in combination with the receiver 1210, the transmitter 1215, or both to obtain information, output information, or perform various other operations as described herein.
[0292] The communications manager 1220 may support wireless communications in accordance with examples as disclosed herein. The TRP communication manager 1225 is capable of, configured to, or operable to support a means for communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The control information manager 1230 is capable of, configured to, or operable to support a means for outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing. The downlink reference signal manager 1235 is capable of, configured to, or operable to support a means for outputting a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG. The random access message manager 1240 is capable of, configured to, or operable to support a means for obtaining a PRACH message from the UE via the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on a value of the one-bit indicator field.
[0293] Additionally, or alternatively, the communications manager 1220 may support wireless communications in accordance with examples as disclosed herein. The TRP communication manager 1225 is capable of, configured to, or operable to support a means for communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The TA offset manager 1245 is capable of, configured to, or operable to support a means for outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a TA offset. The random access message manager 1240 is capable of, configured to, or operable to support a means for obtaining a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0294] FIG. 13 shows a block diagram 1300 of a communications manager 1320 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The communications manager 1320 may be an example of aspects of a communications manager 1120, a communications manager 1220, or both, as described herein. The communications manager 1320, or various components thereof, may be an example of means for performing various aspects of timing parameter determination in asymmetric communication scenarios as described herein. For example, the communications manager 1320 may include an TRP communication manager 1325, a control information manager 1330, a downlink reference signal manager 1335, a random access message manager 1340, a TA offset manager 1345, an SSB manager 1350, or any combination thereof. Each of these components, or components or subcomponents thereof (e.g., one or more processors, one or more memories) , may communicate, directly or indirectly, with one another (e.g., via one or more buses) . The communications may include communications within a protocol layer of a protocol stack, communications associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack, within a device, component, or virtualized component associated with a network entity 105, between devices, components, or virtualized components associated with a network entity 105) , or any combination thereof.
[0295] The communications manager 1320 may support wireless communications in accordance with examples as disclosed herein. The TRP communication manager 1325 is capable of, configured to, or operable to support a means for communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The control information manager 1330 is capable of, configured to, or operable to support a means for outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing. The downlink reference signal manager 1335 is capable of, configured to, or operable to support a means for outputting a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG. The random access message manager 1340 is capable of, configured to, or operable to support a means for obtaining a PRACH message from the UE via the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on a value of the one-bit indicator field.
[0296] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value. In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including a second value.
[0297] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with a serving cell PCI. In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0298] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with the first TAG. In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with the second TAG.
[0299] In some examples, the UE is indicated with a first TCI state and a second TCI state. In some examples, the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including a first value and based on the first TCI state. In some examples, the downlink reference timing is determined based on the value of the one-bit indicator field including a second value and based on the second TCI state.
[0300] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with a serving cell PCI.
[0301] In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on value of the one-bit indicator field including the first value and based on the first TCI state being associated with a non-serving cell PCI or an additional PCI.
[0302] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with a serving cell PCI.
[0303] In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with a non-serving cell PCI or an additional PCI.
[0304] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with the first TAG.
[0305] In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with the second TAG.
[0306] In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with the first TAG.
[0307] In some examples, the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with the second TAG.
[0308] In some examples, the first TRP and the second TRP are associated with a same cell. In some examples, the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based on the value of the one-bit indicator field including a first value, or the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based on the value of the one-bit indicator field including a second value.
[0309] In some examples, the first TAG is associated with a TCI state of a CORESET that is associated with a Type-1 PDCCH CSS.
[0310] In some examples, the one-bit indicator field includes a PRACH downlink reference timing field, a PL offset indicator field, or a PRACH association indicator field.
[0311] In some examples, the SSB manager 1350 is capable of, configured to, or operable to support a means for outputting a first set of SSBs via the first TRP and a second set of SSBs via the second TRP, where the first set of SSBs are associated with a serving cell PCI and the second set of SSBs are associated with a non-serving cell PCI.
[0312] In some examples, the DCI message is associated with a PDCCH order DCI. In some examples, obtaining the PRACH message from the UE via the first TRP or the second TRP is based on the PDCCH order DCI.
[0313] In some examples, the control information manager 1330 is capable of, configured to, or operable to support a means for outputting control signaling that indicates a first identifier of the first TAG that is associated with a serving cell PCI, a second identifier of the second TAG that is associated with a non-serving cell PCI, or both.
[0314] In some examples, the downlink reference timing includes a timing associated with a first detected path in a time domain of either one of the first set of downlink reference signals or one of the second set of downlink reference signals.
[0315] Additionally, or alternatively, the communications manager 1320 may support wireless communications in accordance with examples as disclosed herein. In some examples, the TRP communication manager 1325 is capable of, configured to, or operable to support a means for communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TA group, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The TA offset manager 1345 is capable of, configured to, or operable to support a means for outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a TA offset. In some examples, the random access message manager 1340 is capable of, configured to, or operable to support a means for obtaining a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0316] In some examples, the TA offset is determined based on the value of the one-bit indicator field including a first value. In some examples, the TA offset is determined based on the value of the one-bit indicator field including a second value.
[0317] In some examples, the TA offset is determined based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with a serving cell PCI. In some examples, the TA offset is determined based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0318] In some examples, the TA offset is determined based on the value of the one-bit indicator field including a first value, or based on the value of the one-bit indicator field including a second value and an indicated TCI state being associated with the first TA group. In some examples, the TA offset is determined based on the value of the one-bit indicator field including the second value and the indicated TCI state being associated with the second TAG.
[0319] In some examples, the UE is indicated with a first TCI state and a second TCI state. In some examples, the TA offset is determined based on the value of the one-bit indicator field including a first value and based on the first TCI state. In some examples, the TA offset is determined based on the value of the one-bit indicator field including a second value and based on the second TCI state.
[0320] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with a serving cell PCI.
[0321] In some examples, the TA offset is determined based on value of the one-bit indicator field including the first value and based on the first TCI state being associated with a non-serving cell PCI or an additional PCI.
[0322] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with a serving cell PCI.
[0323] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with a non-serving cell PCI or an additional PCI.
[0324] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with the first TAG.
[0325] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the first value and based on the first TCI state being associated with the second TAG.
[0326] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with the first TAG.
[0327] In some examples, the TA offset is determined based on the value of the one-bit indicator field including the second value and based on the second TCI state being associated with the second TAG.
[0328] In some examples, the first TRP and the second TRP are associated with a same cell. In some examples, the TA offset is determined based on the value of the one-bit indicator field including a first value. In some examples, the TA offset is determined based on the value of the one-bit indicator field including a second value.
[0329] In some examples, the first TAG is associated with a TCI state of a CORESET that is associated with a Type-1 PDCCH CSS.
[0330] In some examples, the one-bit indicator field includes a TA offset field, a PL offset indicator field, or a PRACH association indicator field.
[0331] In some examples, the SSB manager 1350 is capable of, configured to, or operable to support a means for outputting a first set of SSBs via the first TRP and a second set of SSBs via the second TRP, where the first set of SSBs are associated with a serving cell PCI and the second set of SSBs are associated with a non-serving cell PCI.
[0332] In some examples, the DCI message is associated with a PDCCH order DCI. In some examples, obtaining the PRACH message to the first TRP or the second TRP is based on the PDCCH order DCI.
[0333] In some examples, the control information manager 1330 is capable of, configured to, or operable to support a means for outputting control signaling that indicates a first TA offset associated with the first TAG, a second TA offset associated with the second TAG, or both, where the TA offset is determined as either the first TA offset or the second TA offset based on the value of the one-bit indicator field.
[0334] FIG. 14 shows a diagram of a system 1400 including a device 1405 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The device 1405 may be an example of or include components of a device 1105, a device 1205, or a network entity 105 as described herein. The device 1405 may communicate with other network devices or network equipment such as one or more of the network entities 105, UEs 115, or any combination thereof. The communications may include communications over one or more wired interfaces, over one or more wireless interfaces, or any combination thereof. The device 1405 may include components that support outputting and obtaining communications, such as a communications manager 1420, a transceiver 1410, one or more antennas 1415, at least one memory 1425, code 1430, and at least one processor 1435. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1440) .
[0335] The transceiver 1410 may support bi-directional communications via wired links, wireless links, or both as described herein. In some examples, the transceiver 1410 may include a wired transceiver and may communicate bi-directionally with another wired transceiver. Additionally, or alternatively, in some examples, the transceiver 1410 may include a wireless transceiver and may communicate bi-directionally with another wireless transceiver. In some examples, the device 1405 may include one or more antennas 1415, which may be capable of transmitting or receiving wireless transmissions (e.g., concurrently) . The transceiver 1410 may also include a modem to modulate signals, to provide the modulated signals for transmission (e.g., by one or more antennas 1415, by a wired transmitter) , to receive modulated signals (e.g., from one or more antennas 1415, from a wired receiver) , and to demodulate signals. In some implementations, the transceiver 1410 may include one or more interfaces, such as one or more interfaces coupled with the one or more antennas 1415 that are configured to support various receiving or obtaining operations, or one or more interfaces coupled with the one or more antennas 1415 that are configured to support various transmitting or outputting operations, or a combination thereof. In some implementations, the transceiver 1410 may include or be configured for coupling with one or more processors or one or more memory components that are operable to perform or support operations based on received or obtained information or signals, or to generate information or other signals for transmission or other outputting, or any combination thereof. In some implementations, the transceiver 1410, or the transceiver 1410 and the one or more antennas 1415, or the transceiver 1410 and the one or more antennas 1415 and one or more processors or one or more memory components (e.g., the at least one processor 1435, the at least one memory 1425, or both) , may be included in a chip or chip assembly that is installed in the device 1405. In some examples, the transceiver 1410 may be operable to support communications via one or more communications links (e.g., communication link (s) 125, backhaul communication link (s) 120, a midhaul communication link 162, a fronthaul communication link 168) .
[0336] The at least one memory 1425 may include RAM, ROM, or any combination thereof. The at least one memory 1425 may store computer-readable, computer-executable, or processor-executable code, such as the code 1430. The code 1430 may include instructions that, when executed by one or more of the at least one processor 1435, cause the device 1405 to perform various functions described herein. The code 1430 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 1430 may not be directly executable by a processor of the at least one processor 1435 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 1425 may include, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices. In some examples, the at least one processor 1435 may include multiple processors and the at least one memory 1425 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories which may, individually or collectively, be configured to perform various functions herein (for example, as part of a processing system) .
[0337] The at least one processor 1435 may include one or more intelligent hardware devices (e.g., one or more general-purpose processors, one or more DSPs, one or more CPUs, one or more graphics processing units (GPUs) , one or more neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , one or more microcontrollers, one or more ASICs, one or more FPGAs, one or more programmable logic devices, discrete gate or transistor logic, one or more discrete hardware components, or any combination thereof) . In some cases, the at least one processor 1435 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into one or more of the at least one processor 1435. The at least one processor 1435 may be configured to execute computer-readable instructions stored in a memory (e.g., one or more of the at least one memory 1425) to cause the device 1405 to perform various functions (e.g., functions or tasks supporting timing parameter determination in asymmetric communication scenarios) . For example, the device 1405 or a component of the device 1405 may include at least one processor 1435 and at least one memory 1425 coupled with one or more of the at least one processor 1435, the at least one processor 1435 and the at least one memory 1425 configured to perform various functions described herein. The at least one processor 1435 may be an example of a cloud-computing platform (e.g., one or more physical nodes and supporting software such as operating systems, virtual machines, or container instances) that may host the functions (e.g., by executing code 1430) to perform the functions of the device 1405. The at least one processor 1435 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in the device 1405 (such as within one or more of the at least one memory 1425) .
[0338] In some examples, the at least one processor 1435 may include multiple processors and the at least one memory 1425 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein. In some examples, the at least one processor 1435 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 1435) and memory circuitry (which may include the at least one memory 1425) ) , or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. For example, the at least one processor 1435 or a processing system including the at least one processor 1435 may be configured to, configurable to, or operable to cause the device 1405 to perform one or more of the functions described herein. Further, as described herein, being “configured to, ” being “configurable to, ” and being “operable to”may be used interchangeably and may be associated with a capability, when executing code stored in the at least one memory 1425 or otherwise, to perform one or more of the functions described herein.
[0339] In some examples, a bus 1440 may support communications of (e.g., within) a protocol layer of a protocol stack. In some examples, a bus 1440 may support communications associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack) , which may include communications performed within a component of the device 1405, or between different components of the device 1405 that may be co-located or located in different locations (e.g., where the device 1405 may refer to a system in which one or more of the communications manager 1420, the transceiver 1410, the at least one memory 1425, the code 1430, and the at least one processor 1435 may be located in one of the different components or divided between different components) .
[0340] In some examples, the communications manager 1420 may manage aspects of communications with a core network 130 (e.g., via one or more wired or wireless backhaul links) . For example, the communications manager 1420 may manage the transfer of data communications for client devices, such as one or more UEs 115. In some examples, the communications manager 1420 may manage communications with one or more other network entities 105, and may include a controller or scheduler for controlling communications with UEs 115 (e.g., in cooperation with the one or more other network devices) . In some examples, the communications manager 1420 may support an X2 interface within an LTE / LTE-Awireless communications network technology to provide communication between network entities 105.
[0341] The communications manager 1420 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1420 is capable of, configured to, or operable to support a means for communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The communications manager 1420 is capable of, configured to, or operable to support a means for outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing. The communications manager 1420 is capable of, configured to, or operable to support a means for outputting a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG. The communications manager 1420 is capable of, configured to, or operable to support a means for obtaining a PRACH message from the UE via the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on a value of the one-bit indicator field.
[0342] Additionally, or alternatively, the communications manager 1420 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1420 is capable of, configured to, or operable to support a means for communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The communications manager 1420 is capable of, configured to, or operable to support a means for outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a TA offset. The communications manager 1420 is capable of, configured to, or operable to support a means for obtaining a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field.
[0343] By including or configuring the communications manager 1420 in accordance with examples as described herein, the device 1405 may support techniques for improved communication reliability, reduced latency, more efficient utilization of communication resources, and improved coordination between devices, among other benefits.
[0344] In some examples, the communications manager 1420 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the transceiver 1410, the one or more antennas 1415 (e.g., where applicable) , or any combination thereof. Although the communications manager 1420 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 1420 may be supported by or performed by the transceiver 1410, one or more of the at least one processor 1435, one or more of the at least one memory 1425, the code 1430, or any combination thereof (for example, by a processing system including at least a portion of the at least one processor 1435, the at least one memory 1425, the code 1430, or any combination thereof) . For example, the code 1430 may include instructions executable by one or more of the at least one processor 1435 to cause the device 1405 to perform various aspects of timing parameter determination in asymmetric communication scenarios as described herein, or the at least one processor 1435 and the at least one memory 1425 may be otherwise configured to, individually or collectively, perform or support such operations.
[0345] FIG. 15 shows a flowchart illustrating a method 1500 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The operations of the method 1500 may be implemented by a UE or its components as described herein. For example, the operations of the method 1500 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0346] At 1505, the method may include communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The operations of 1505 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1505 may be performed by an TRP communication component 925 as described with reference to FIG. 9.
[0347] At 1510, the method may include receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing. The operations of 1510 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1510 may be performed by a control information component 930 as described with reference to FIG. 9.
[0348] At 1515, the method may include receiving a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG. The operations of 1515 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1515 may be performed by a downlink reference signal component 935 as described with reference to FIG. 9.
[0349] At 1520, the method may include transmitting a PRACH message to the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based on a value of the one-bit indicator field. The operations of 1520 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1520 may be performed by a random access message component 940 as described with reference to FIG. 9.
[0350] FIG. 16 shows a flowchart illustrating a method 1600 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The operations of the method 1600 may be implemented by a UE or its components as described herein. For example, the operations of the method 1600 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0351] At 1605, the method may include communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The operations of 1605 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1605 may be performed by an TRP communication component 925 as described with reference to FIG. 9.
[0352] At 1610, in some examples, the method may include receiving control signaling that indicates a first identifier of the first TAG that is associated with a serving cell PCI, a second identifier of the second TAG that is associated with a non-serving cell PCI, or both. The operations of 1610 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1610 may be performed by a control information component 930 as described with reference to FIG. 9.
[0353] At 1615, the method may include receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing. The operations of 1615 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1615 may be performed by a control information component 930 as described with reference to FIG. 9.
[0354] At 1620, the method may include receiving a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG. The operations of 1620 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1620 may be performed by a downlink reference signal component 935 as described with reference to FIG. 9.
[0355] At 1625, the method may include transmitting a PRACH message to the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based on a value of the one-bit indicator field. The operations of 1625 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1625 may be performed by a random access message component 940 as described with reference to FIG. 9.
[0356] FIG. 17 shows a flowchart illustrating a method 1700 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The operations of the method 1700 may be implemented by a UE or its components as described herein. For example, the operations of the method 1700 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0357] At 1705, the method may include communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The operations of 1705 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1705 may be performed by an TRP communication component 925 as described with reference to FIG. 9.
[0358] At 1710, the method may include receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a TA offset. The operations of 1710 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1710 may be performed by a TA offset component 945 as described with reference to FIG. 9.
[0359] At 1715, the method may include transmitting a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field. The operations of 1715 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1715 may be performed by a random access message component 940 as described with reference to FIG. 9.
[0360] FIG. 18 shows a flowchart illustrating a method 1800 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The operations of the method 1800 may be implemented by a UE or its components as described herein. For example, the operations of the method 1800 may be performed by a UE 115 as described with reference to FIGs. 1 through 10. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally, or alternatively, the UE may perform aspects of the described functions using special-purpose hardware.
[0361] At 1805, the method may include communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The operations of 1805 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1805 may be performed by an TRP communication component 925 as described with reference to FIG. 9.
[0362] At 1810, in some examples, the method may include receiving control signaling that indicates a first TA offset associated with the first TAG, a second TA offset associated with the second TAG, or both, where the TA offset is determined as either the first TA offset or the second TA offset based on the value of the one-bit indicator field. The operations of 1810 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1810 may be performed by a control information component 930 as described with reference to FIG. 9.
[0363] At 1815, the method may include receiving, from the first TRP, a DCI message including a one-bit indicator field associated with a TA offset. The operations of 1815 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1815 may be performed by a TA offset component 945 as described with reference to FIG. 9.
[0364] At 1820, the method may include transmitting a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field. The operations of 1820 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1820 may be performed by a random access message component 940 as described with reference to FIG. 9.
[0365] FIG. 19 shows a flowchart illustrating a method 1900 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The operations of the method 1900 may be implemented by a network entity or its components as described herein. For example, the operations of the method 1900 may be performed by a network entity as described with reference to FIGs. 1 through 6 and 11 through 14. In some examples, a network entity may execute a set of instructions to control the functional elements of the network entity to perform the described functions. Additionally, or alternatively, the network entity may perform aspects of the described functions using special-purpose hardware.
[0366] At 1905, the method may include communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The operations of 1905 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1905 may be performed by an TRP communication manager 1325 as described with reference to FIG. 13.
[0367] At 1910, the method may include outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a downlink reference timing. The operations of 1910 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1910 may be performed by a control information manager 1330 as described with reference to FIG. 13.
[0368] At 1915, the method may include outputting a first set of downlink reference signals and a second set of downlink reference signals, where the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG. The operations of 1915 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1915 may be performed by a downlink reference signal manager 1335 as described with reference to FIG. 13.
[0369] At 1920, the method may include obtaining a PRACH message from the UE via the first TRP or the second TRP in accordance with the downlink reference timing, where the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based on a value of the one-bit indicator field. The operations of 1920 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1920 may be performed by a random access message manager 1340 as described with reference to FIG. 13.
[0370] FIG. 20 shows a flowchart illustrating a method 2000 that supports timing parameter determination in asymmetric communication scenarios in accordance with one or more aspects of the present disclosure. The operations of the method 2000 may be implemented by a network entity or its components as described herein. For example, the operations of the method 2000 may be performed by a network entity as described with reference to FIGs. 1 through 6 and 11 through 14. In some examples, a network entity may execute a set of instructions to control the functional elements of the network entity to perform the described functions. Additionally, or alternatively, the network entity may perform aspects of the described functions using special-purpose hardware.
[0371] At 2005, the method may include communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and where the second TRP is configured to transmit downlink reference signals. The operations of 2005 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 2005 may be performed by an TRP communication manager 1325 as described with reference to FIG. 13.
[0372] At 2010, the method may include outputting, via the first TRP, a DCI message including a one-bit indicator field associated with a TA offset. The operations of 2010 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 2010 may be performed by a TA offset manager 1345 as described with reference to FIG. 13.
[0373] At 2015, the method may include obtaining a PRACH message to the first TRP or the second TRP in accordance with the TA offset, where the TA offset is determined based on a value of the one-bit indicator field. The operations of 2015 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 2015 may be performed by a random access message manager 1340 as described with reference to FIG. 13.
[0374] The following provides an overview of aspects of the present disclosure:
[0375] Aspect 1: A method for wireless communications at a UE, comprising: communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and wherein the second TRP is configured to transmit downlink reference signals; receiving, from the first TRP, a DCI message comprising a one-bit indicator field associated with a downlink reference timing; receiving a first set of downlink reference signals and a second set of downlink reference signals, wherein the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG; and transmitting a PRACH message to the first TRP or the second TRP in accordance with the downlink reference timing, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on a value of the one-bit indicator field.
[0376] Aspect 2: The method of aspect 1, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value, or the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a second value.
[0377] Aspect 3: The method of aspect 1, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value, or based at least in part on the value of the one-bit indicator field comprising a second value and an indicated TCI state being associated with a serving cell PCI, or the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and the indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0378] Aspect 4: The method of aspects 1 or 3, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value, or based at least in part on the value of the one-bit indicator field comprising a second value and an indicated TCI state being associated with the first TAG, or the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and the indicated TCI state being associated with the second TAG.
[0379] Aspect 5: The method of aspect 1, wherein the UE is indicated with a first indicated TCI state and a second indicated TCI state, and the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value and based at least in part on the first indicated TCI state, or the downlink reference timing is determined based at least in part on the value of the one-bit indicator field comprising a second value and based at least in part on the second indicated TCI state.
[0380] Aspect 6: The method of aspect 5, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first indicated TCI state being associated with a serving cell PCI.
[0381] Aspect 7: The method of any of aspects 5 through 6, wherein the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on value of the one-bit indicator field comprising the first value and based at least in part on the first indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0382] Aspect 8: The method of any of aspects 5 through 7, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second indicated TCI state being associated with a serving cell PCI.
[0383] Aspect 9: The method of any of aspects 5 through 8, wherein the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0384] Aspect 10: The method of any of aspects 5 through 9, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first indicated TCI state being associated with the first TAG.
[0385] Aspect 11: The method of any of aspects 5 through 10, wherein the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first indicated TCI state being associated with the second TAG.
[0386] Aspect 12: The method of any of aspects 5 through 11, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second indicated TCI state being associated with the first TAG.
[0387] Aspect 13: The method of any of aspects 5 through 12, wherein the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second indicated TCI state being associated with the second TAG.
[0388] Aspect 14: The method of aspect 1, wherein the first TRP and the second TRP are associated with a same cell, and the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value, or the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a second value.
[0389] Aspect 15: The method of aspect 14, wherein the first TAG is associated with a TCI state of a CORESET that is associated with a Type-1 physical downlink control channel CSS.
[0390] Aspect 16: The method of any of aspects 1 through 15, wherein the one-bit indicator field comprises a PRACH downlink reference timing field, a PL offset indicator field, or a PRACH association indicator field.
[0391] Aspect 17: The method of any of aspects 1 through 16, further comprising: receiving a first set of SSBs from the first TRP and a second set of SSBs from the second TRP, wherein the first set of SSBs are associated with a serving cell PCI and the second set of SSBs are associated with a non-serving cell PCI.
[0392] Aspect 18: The method of any of aspects 1 through 17, wherein the DCI message is associated with a physical downlink control channel order DCI, and transmitting the PRACH message to the first TRP or the second TRP is based at least in part on the physical downlink control channel order DCI.
[0393] Aspect 19: The method of any of aspects 1 through 18, further comprising: receiving control signaling that indicates a first identifier of the first TAG that is associated with a serving cell PCI, a second identifier of the second TAG that is associated with a non-serving cell PCI, or both.
[0394] Aspect 20: The method of any of aspects 1 through 19, wherein the downlink reference timing comprises a timing associated with a first detected path in a time domain of either one of the first set of downlink reference signals or one of the second set of downlink reference signals.
[0395] Aspect 21: A method for wireless communications at a UE, comprising: communicating with a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and wherein the second TRP is configured to transmit downlink reference signals; receiving, from the first TRP, a DCI message comprising a one-bit indicator field associated with a TA offset; and transmitting a PRACH message to the first TRP or the second TRP in accordance with the TA offset, wherein the TA offset is determined based at least in part on a value of the one-bit indicator field.
[0396] Aspect 22: The method of aspect 21, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a first value, or the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a second value.
[0397] Aspect 23: The method of aspect 21, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a first value, or based at least in part on the value of the one-bit indicator field comprising a second value and an indicated TCI state being associated with a serving cell PCI, or the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and the indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0398] Aspect 24: The method of aspects 21 or 23, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a first value, or based at least in part on the value of the one-bit indicator field comprising a second value and an indicated TCI state being associated with the first TAG, or the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and the indicated TCI state being associated with the second TAG.
[0399] Aspect 25: The method of aspect 21, wherein the UE is indicated with a first TCI state and a second TCI state, and the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a first value and based at least in part on the first TCI state, or the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a second value and based at least in part on the second TCI state.
[0400] Aspect 26: The method of aspect 25, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first TCI state being associated with a serving cell PCI.
[0401] Aspect 27: The method of any of aspects 25 through 26, wherein the TA offset is determined based at least in part on value of the one-bit indicator field comprising the first value and based at least in part on the first TCI state being associated with a non-serving cell PCI or an additional PCI.
[0402] Aspect 28: The method of any of aspects 25 through 27, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second TCI state being associated with a serving cell PCI.
[0403] Aspect 29: The method of any of aspects 25 through 28, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second TCI state being associated with a non-serving cell PCI or an additional PCI.
[0404] Aspect 30: The method of any of aspects 25 through 29, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first TCI state being associated with the first TAG.
[0405] Aspect 31: The method of any of aspects 25 through 30, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first TCI state being associated with the second TAG.
[0406] Aspect 32: The method of any of aspects 25 through 31, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second TCI state being associated with the first TAG.
[0407] Aspect 33: The method of any of aspects 25 through 32, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second TCI state being associated with the second TAG.
[0408] Aspect 34: The method of aspect 21, wherein the first TRP and the second TRP are associated with a same cell, and the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a first value, or the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a second value.
[0409] Aspect 35: The method of aspect 34, wherein the first TAG is associated with a TCI state of a CORESET that is associated with a Type-1 physical downlink control channel CSS.
[0410] Aspect 36: The method of any of aspects 21 through 35, wherein the one-bit indicator field comprises a TA offset field, a PL offset indicator field, or a PRACH association indicator field.
[0411] Aspect 37: The method of any of aspects 21 through 36, further comprising: receiving a first set of SSBs from the first TRP and a second set of SSBs from the second TRP, wherein the first set of SSBs are associated with a serving cell PCI and the second set of SSBs are associated with a non-serving cell PCI.
[0412] Aspect 38: The method of any of aspects 21 through 37, wherein the DCI message is associated with a physical downlink control channel order DCI, and transmitting the PRACH message to the first TRP or the second TRP is based at least in part on the physical downlink control channel order DCI.
[0413] Aspect 39: The method of any of aspects 21 through 38, further comprising: receiving control signaling that indicates a first TA offset associated with the first TAG, a second TA offset associated with the second TAG, or both, wherein the TA offset is determined as either the first TA offset or the second TA offset based at least in part on the value of the one-bit indicator field.
[0414] Aspect 40: A method for wireless communications at a network entity, comprising: communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and wherein the second TRP is configured to transmit downlink reference signals; outputting, via the first TRP, a DCI message comprising a one-bit indicator field associated with a downlink reference timing; outputting a first set of downlink reference signals and a second set of downlink reference signals, wherein the first set of downlink reference signals are associated with one or more first TCI states of a first reference cell associated with the first TAG and the second set of downlink reference signals are associated with one or more second TCI states of a second reference cell associated with the second TAG; and obtaining a PRACH message from the UE via the first TRP or the second TRP in accordance with the downlink reference timing, wherein the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based at least in part on a value of the one-bit indicator field.
[0415] Aspect 41: The method of aspect 40, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value, or the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a second value.
[0416] Aspect 42: The method of aspect 40, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value, or based at least in part on the value of the one-bit indicator field comprising a second value and an indicated TCI state being associated with a serving cell PCI, or the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and the indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0417] Aspect 43: The method of aspects 40 or 42, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value, or based at least in part on the value of the one-bit indicator field comprising a second value and an indicated TCI state being associated with the first TAG, or the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and the indicated TCI state being associated with the second TAG.
[0418] Aspect 44: The method of aspect 40, wherein the UE is indicated with a first TCI state and a second TCI state, and the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value and based at least in part on the first TCI state, or the downlink reference timing is determined based at least in part on the value of the one-bit indicator field comprising a second value and based at least in part on the second TCI state.
[0419] Aspect 45: The method of aspect 44, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first TCI state being associated with a serving cell PCI.
[0420] Aspect 46: The method of any of aspects 44 through 45, wherein the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on value of the one-bit indicator field comprising the first value and based at least in part on the first TCI state being associated with a non-serving cell PCI or an additional PCI.
[0421] Aspect 47: The method of any of aspects 44 through 46, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second TCI state being associated with a serving cell PCI.
[0422] Aspect 48: The method of any of aspects 44 through 47, wherein the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second TCI state being associated with a non-serving cell PCI or an additional PCI.
[0423] Aspect 49: The method of any of aspects 44 through 48, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first TCI state being associated with the first TAG.
[0424] Aspect 50: The method of any of aspects 44 through 49, wherein the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first TCI state being associated with the second TAG.
[0425] Aspect 51: The method of any of aspects 44 through 50, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second TCI state being associated with the first TAG.
[0426] Aspect 52: The method of any of aspects 44 through 51, wherein the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second TCI state being associated with the second TAG.
[0427] Aspect 53: The method of aspect 40, wherein the first TRP and the second TRP are associated with a same cell, and the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value, or the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a second value.
[0428] Aspect 54: The method of aspect 53, wherein the first TAG is associated with a TCI state of a CORESET that is associated with a Type-1 physical downlink control channel CSS.
[0429] Aspect 55: The method of any of aspects 40 through 54, wherein the one-bit indicator field comprises a PRACH downlink reference timing field, a PL offset indicator field, or a PRACH association indicator field.
[0430] Aspect 56: The method of any of aspects 40 through 55, further comprising: outputting a first set of SSBs via the first TRP and a second set of SSBs via the second TRP, wherein the first set of SSBs are associated with a serving cell PCI and the second set of SSBs are associated with a non-serving cell PCI.
[0431] Aspect 57: The method of any of aspects 40 through 56, wherein the DCI message is associated with a physical downlink control channel order DCI, and obtaining the PRACH message from the UE via the first TRP or the second TRP is based at least in part on the physical downlink control channel order DCI.
[0432] Aspect 58: The method of any of aspects 40 through 57, further comprising: outputting control signaling that indicates a first identifier of the first TAG that is associated with a serving cell PCI, a second identifier of the second TAG that is associated with a non-serving cell PCI, or both.
[0433] Aspect 59: The method of any of aspects 40 through 58, wherein the downlink reference timing comprises a timing associated with a first detected path in a time domain of either one of the first set of downlink reference signals or one of the second set of downlink reference signals.
[0434] Aspect 60: A method for wireless communications at a network entity, comprising: communicating with a UE via a first TRP associated with a first TAG and a second TRP associated with a second TAG, the first TRP configured to transmit data and control downlink communications, and wherein the second TRP is configured to transmit downlink reference signals; outputting, via the first TRP, a DCI message comprising a one-bit indicator field associated with a TA offset; and obtaining a PRACH message to the first TRP or the second TRP in accordance with the TA offset, wherein the TA offset is determined based at least in part on a value of the one-bit indicator field.
[0435] Aspect 61: The method of aspect 60, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a first value, or the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a second value.
[0436] Aspect 62: The method of aspect 60, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a first value, or based at least in part on the value of the one-bit indicator field comprising a second value and an indicated TCI state being associated with a serving cell PCI, or the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and the indicated TCI state being associated with a non-serving cell PCI or an additional PCI.
[0437] Aspect 63: The method of aspects 60 or 62, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a first value, or based at least in part on the value of the one-bit indicator field comprising a second value and an indicated TCI state being associated with the first TAG, or the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and the indicated TCI state being associated with the second TAG.
[0438] Aspect 64: The method of aspect 60, wherein the UE is indicated with a first TCI state and a second TCI state, and the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a first value and based at least in part on the first TCI state, or the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a second value and based at least in part on the second TCI state.
[0439] Aspect 65: The method of aspect 64, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first TCI state being associated with a serving cell PCI.
[0440] Aspect 66: The method of any of aspects 64 through 65, wherein the TA offset is determined based at least in part on value of the one-bit indicator field comprising the first value and based at least in part on the first TCI state being associated with a non-serving cell PCI or an additional PCI.
[0441] Aspect 67: The method of any of aspects 64 through 66, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second TCI state being associated with a serving cell PCI.
[0442] Aspect 68: The method of any of aspects 64 through 67, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second TCI state being associated with a non-serving cell PCI or an additional PCI.
[0443] Aspect 69: The method of any of aspects 64 through 68, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first TCI state being associated with the first TAG.
[0444] Aspect 70: The method of any of aspects 64 through 69, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first TCI state being associated with the second TAG.
[0445] Aspect 71: The method of any of aspects 64 through 70, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second TCI state being associated with the first TAG.
[0446] Aspect 72: The method of any of aspects 64 through 71, wherein the TA offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second TCI state being associated with the second TAG.
[0447] Aspect 73: The method of aspect 60, wherein the first TRP and the second TRP are associated with a same cell, and the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a first value, or the TA offset is determined based at least in part on the value of the one-bit indicator field comprising a second value.
[0448] Aspect 74: The method of aspect 73, wherein the first TAG is associated with a TCI state of a CORESET that is associated with a Type-1 physical downlink control channel CSS.
[0449] Aspect 75: The method of any of aspects 60 through 74, wherein the one-bit indicator field comprises a TA offset field, a PL offset indicator field, or a PRACH association indicator field.
[0450] Aspect 76: The method of any of aspects 60 through 75, further comprising: outputting a first set of SSBs via the first TRP and a second set of SSBs via the second TRP, wherein the first set of SSBs are associated with a serving cell PCI and the second set of SSBs are associated with a non-serving cell PCI.
[0451] Aspect 77: The method of any of aspects 60 through 76, wherein the DCI message is associated with a physical downlink control channel order DCI, and obtaining the PRACH message to the first TRP or the second TRP is based at least in part on the physical downlink control channel order DCI.
[0452] Aspect 78: The method of any of aspects 60 through 77, further comprising: outputting control signaling that indicates a first TA offset associated with the first TAG, a second TA offset associated with the second TAG, or both, wherein the TA offset is determined as either the first TA offset or the second TA offset based at least in part on the value of the one-bit indicator field.
[0453] Aspect 79: A UE for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to perform a method of any of aspects 1 through 20.
[0454] Aspect 80: A UE for wireless communications, comprising at least one means for performing a method of any of aspects 1 through 20.
[0455] Aspect 81: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 1 through 20.
[0456] Aspect 82: A UE for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to perform a method of any of aspects 21 through 39.
[0457] Aspect 83: A UE for wireless communications, comprising at least one means for performing a method of any of aspects 21 through 39.
[0458] Aspect 84: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 21 through 39.
[0459] Aspect 85: A network entity for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to perform a method of any of aspects 40 through 59.
[0460] Aspect 86: A network entity for wireless communications, comprising at least one means for performing a method of any of aspects 40 through 59.
[0461] Aspect 87: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 40 through 59.
[0462] Aspect 88: A network entity for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to perform a method of any of aspects 60 through 78.
[0463] Aspect 89: A network entity for wireless communications, comprising at least one means for performing a method of any of aspects 60 through 78.
[0464] Aspect 90: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 60 through 78.
[0465] It should be noted that the methods described herein describe possible implementations. The operations and the steps may be rearranged or otherwise modified and other implementations are possible. Further, aspects from two or more of the methods may be combined.
[0466] Although aspects of an LTE, LTE-A, LTE-APro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-APro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-APro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.
[0467] Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0468] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, a DSP, an ASIC, a CPU, a graphics processing unit (GPU) , a neural processing unit (NPU) , an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor but, in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) . Any functions or operations described herein as being capable of being performed by a processor may be performed by multiple processors that, individually or collectively, are capable of performing the described functions or operations.
[0469] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as or transmitted using one or more instructions or code of a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
[0470] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and Blu-ray disc. Disks may reproduce data magnetically, and discs may reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media. Any functions or operations described herein as being capable of being performed by a memory may be performed by multiple memories that, individually or collectively, are capable of performing the described functions or operations.
[0471] As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”
[0472] As used herein, including in the claims, the article “a” before a noun is open-ended and understood to refer to “at least one” of those nouns or “one or more” of those nouns. Thus, the terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. For example, if a claim recites “acomponent” that performs one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components. Thus, the term “acomponent” having characteristics or performing functions may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent reference to a component introduced with the article “a” using the terms “the” or “said” may refer to any or all of the one or more components. For example, a component introduced with the article “a” may be understood to mean “one or more components, ” and referring to “the component” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ” Similarly, subsequent reference to a component introduced as “one or more components” using the terms “the” or “said” may refer to any or all of the one or more components. For example, referring to “the one or more components” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components. ”
[0473] The term “determine” or “determining” encompasses a variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, a database, or another data structure) , ascertaining, and the like. Also, “determining” can include receiving (e.g., receiving information) , accessing (e.g., accessing data stored in memory) , and the like. Also, “determining” can include resolving, obtaining, selecting, choosing, establishing, and other such similar actions.
[0474] In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label or other subsequent reference label.
[0475] The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some figures, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.
[0476] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A user equipment (UE) , comprising:one or more memories storing processor-executable code; andone or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:communicate with a first transmission-reception point associated with a first timing advance group and a second transmission-reception point associated with a second timing advance group, the first transmission-reception point configured to transmit data and control downlink communications, and wherein the second transmission-reception point is configured to transmit downlink reference signals;receive, from the first transmission-reception point, a downlink control information message comprising a one-bit indicator field associated with a downlink reference timing;receive a first set of downlink reference signals and a second set of downlink reference signals, wherein the first set of downlink reference signals are associated with one or more first transmission configuration indicator states of a first reference cell associated with the first timing advance group and the second set of downlink reference signals are associated with one or more second transmission configuration indicator states of a second reference cell associated with the second timing advance group; andtransmit a physical random access channel message to the first transmission-reception point or the second transmission-reception point in accordance with the downlink reference timing, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on a value of the one-bit indicator field.2.The UE of claim 1, wherein:the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value, orthe downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a second value.3.The UE of claim 1, wherein:the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value, or based at least in part on the value of the one-bit indicator field comprising a second value and an indicated transmission configuration indicator state being associated with a serving cell physical cell identifier, orthe downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and the indicated transmission configuration indicator state being associated with a non-serving cell physical cell identifier or an additional physical cell identifier.4.The UE of claim 1, wherein:the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value, or based at least in part on the value of the one-bit indicator field comprising a second value and an indicated transmission configuration indicator state being associated with the first timing advance group, orthe downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and the indicated transmission configuration indicator state being associated with the second timing advance group.5.The UE of claim 1, wherein the UE is indicated with a first indicated transmission configuration indicator state and a second indicated transmission configuration indicator state, and wherein:the downlink reference timing is determined in accordance with either at least one of the first set of downlink reference signals or at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value and based at least in part on the first indicated transmission configuration indicator state, orthe downlink reference timing is determined based at least in part on the value of the one-bit indicator field comprising a second value and based at least in part on the second indicated transmission configuration indicator state.6.The UE of claim 5, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first indicated transmission configuration indicator state being associated with a serving cell physical cell identifier.7.The UE of claim 5, wherein the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on value of the one-bit indicator field comprising the first value and based at least in part on the first indicated transmission configuration indicator state being associated with a non-serving cell physical cell identifier or an additional physical cell identifier.8.The UE of claim 5, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second indicated transmission configuration indicator state being associated with a serving cell physical cell identifier.9.The UE of claim 5, wherein the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second indicated transmission configuration indicator state being associated with a non-serving cell physical cell identifier or an additional physical cell identifier.10.The UE of claim 5, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first indicated transmission configuration indicator state being associated with the first timing advance group.11.The UE of claim 5, wherein the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the first value and based at least in part on the first indicated transmission configuration indicator state being associated with the second timing advance group.12.The UE of claim 5, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second indicated transmission configuration indicator state being associated with the first timing advance group.13.The UE of claim 5, wherein the downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising the second value and based at least in part on the second indicated transmission configuration indicator state being associated with the second timing advance group.14.The UE of claim 1, wherein the first transmission-reception point and the second transmission-reception point are associated with a same cell, and wherein:the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a first value, orthe downlink reference timing is determined in accordance with at least one of the second set of downlink reference signals based at least in part on the value of the one-bit indicator field comprising a second value.15.A user equipment (UE) , comprising:one or more memories storing processor-executable code; andone or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:communicate with a first transmission-reception point associated with a first timing advance group and a second transmission-reception point associated with a second timing advance group, the first transmission-reception point configured to transmit data and control downlink communications, and wherein the second transmission-reception point is configured to transmit downlink reference signals;receive, from the first transmission-reception point, a downlink control information message comprising a one-bit indicator field associated with a timing advance offset; andtransmit a physical random access channel message to the first transmission-reception point or the second transmission-reception point in accordance with the timing advance offset, wherein the timing advance offset is determined based at least in part on a value of the one-bit indicator field.16.The UE of claim 15, wherein:the timing advance offset is determined based at least in part on the value of the one-bit indicator field comprising a first value, orthe timing advance offset is determined based at least in part on the value of the one-bit indicator field comprising a second value.17.The UE of claim 15, wherein:the timing advance offset is determined based at least in part on the value of the one-bit indicator field comprising a first value, or based at least in part on the value of the one-bit indicator field comprising a second value and an indicated transmission configuration indicator state being associated with a serving cell physical cell identifier, orthe timing advance offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and the indicated transmission configuration indicator state being associated with a non-serving cell physical cell identifier or an additional physical cell identifier.18.The UE of claim 15, wherein:the timing advance offset is determined based at least in part on the value of the one-bit indicator field comprising a first value, or based at least in part on the value of the one-bit indicator field comprising a second value and an indicated transmission configuration indicator state being associated with the first timing advance group, orthe timing advance offset is determined based at least in part on the value of the one-bit indicator field comprising the second value and the indicated transmission configuration indicator state being associated with the second timing advance group.19.The UE of claim 15, wherein the UE is indicated with a first transmission configuration indicator state and a second transmission configuration indicator state, and wherein:the timing advance offset is determined based at least in part on the value of the one-bit indicator field comprising a first value and based at least in part on the first transmission configuration indicator state, orthe timing advance offset is determined based at least in part on the value of the one-bit indicator field comprising a second value and based at least in part on the second transmission configuration indicator state.20.A method for wireless communications at a user equipment (UE) , comprising:communicating with a first transmission-reception point associated with a first timing advance group and a second transmission-reception point associated with a second timing advance group, the first transmission-reception point configured to transmit data and control downlink communications, and wherein the second transmission-reception point is configured to transmit downlink reference signals;receiving, from the first transmission-reception point, a downlink control information message comprising a one-bit indicator field associated with a downlink reference timing;receiving a first set of downlink reference signals and a second set of downlink reference signals, wherein the first set of downlink reference signals are associated with one or more first transmission configuration indicator states of a first reference cell associated with the first timing advance group and the second set of downlink reference signals are associated with one or more second transmission configuration indicator states of a second reference cell associated with the second timing advance group; andtransmitting a physical random access channel message to the first transmission-reception point or the second transmission-reception point in accordance with the downlink reference timing, wherein the downlink reference timing is determined in accordance with at least one of the first set of downlink reference signals or the second set of downlink reference signals based at least in part on a value of the one-bit indicator field.