Small delay cyclic delay diversity for data or control channels

Abstract

Methods, systems, and devices are described for wireless communication. A user equipment (UE) can be associated with a first delay value for a small delay cyclic delay diversity (CDD) scheme for a broadcast channel. In some examples, the first delay value can be selected from a set of candidate delay values based on a frequency band associated with the broadcast channel. The UE can perform a channel estimation for the broadcast channel in accordance with one or more delay spread values associated with a multipath profile of the broadcast channel, where the one or more delay spread values are based at least in part on the first delay value associated with the small delay CDD scheme. The UE can receive a message via the broadcast channel based at least in part on performing the channel estimation.

Description

[0001] Cross-references

[0002] This patent application claims the benefit of U.S. Patent Application No. 18 / 525,730, filed November 30, 2023, entitled “SMALL DELAYCYCLIC DELAY DIVERSITY FOR DATA OR CONTROL CHANNELS”, which has been assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] The following relates to wireless communication, including small-delay cyclic delay diversity for data or control channels. Background Technology

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, message sending and receiving, broadcasting, and so on. These systems can support communication with multiple users by sharing available system resources, such as time, frequency, and power. Examples of such multiple access systems include fourth-generation (4G) systems (such as Long Term Evolution (LTE) systems, LTE-A Advanced (LTE-A) systems, or LTE-A Pro systems) and fifth-generation (5G) systems (which may be referred to as New Radio (NR) systems). These systems may employ 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 Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM).

[0005] A wireless multiple access communication system may include one or more base stations, each supporting wireless communication of communication devices, which may be referred to as user equipment (UE). In some examples, the UE may perform channel estimation to receive one or more messages from a network entity via a channel. Summary of the Invention

[0006] The described techniques relate to improved methods, systems, devices, and apparatuses supporting small-delay cyclic delay diversity for data or control channels. For example, the described techniques provide a user equipment (UE) to determine a delay value for a small-delay cyclic delay diversity (CDD) scheme. Based on this delay value, the UE can determine one or more delay spread values ​​associated with the multipath distribution of the channel. Therefore, the UE can perform channel estimation for the channel based on the one or more delay spread values, which can support the UE receiving messages via the channel. In some examples, such as for a physical broadcast channel (PBCH), the UE can be configured with a delay value or a range of delay values ​​based on the frequency band of the PBCH. In some cases, the delay value of the downlink control channel (e.g., CORESET 0) of a scheduling system information block (SIB) (e.g., SIB1) can be the same as the delay value of the PBCH. Additionally or alternatively, the UE can receive an indication of the delay value for the downlink control channel via the PBCH. In some examples, for broadcast data channels (e.g., SIBs), the corresponding delay value may be indicated by the downlink control channel that schedules the broadcast data channel, and this delay value may be selected from a set of band-specific delay values. In some examples, such as for shared search space (CSS), UE-specific search space (USS), and unicast data channels, the UE may receive a first control message indicating a set of candidate delay values. The UE may then receive a second control message indicating an active delay value for performing channel estimation. Therefore, the UE can obtain delay values ​​corresponding to different channel types, and the UE can perform channel estimation accordingly to successfully receive messages.

[0007] A method for wireless communication by a UE is described. The method may include: obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel; performing channel estimation for the broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme; and receiving a message via the broadcast channel based on performing the channel estimation.

[0008] A UE for wireless communication is described. The UE may include one or more memories storing processor-executable code and one or more processors coupled to the one or more memories. The one or more processors may operate individually or jointly to execute the code such that the UE: obtains a first delay value associated with a low-delay CDD scheme for a broadcast channel; performs channel estimation for the broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme; and receives a message via the broadcast channel based on the performance of the channel estimation.

[0009] Another UE for wireless communication is described. The UE may include: components for obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel; components for performing channel estimation for the broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme; and components for receiving a message via the broadcast channel based on performing the channel estimation.

[0010] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by one or more processors to: obtain a first delay value associated with a low-delay CDD scheme for a broadcast channel; perform channel estimation for the broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme; and receive a message via the broadcast channel based on the performance of the channel estimation.

[0011] In some examples of the methods, UEs, and nontransitory computer-readable media described herein, obtaining the first delay value may include operations, features, components, or instructions for selecting the first delay value from a first set of candidate delay values ​​associated with the broadcast channel.

[0012] The methods described herein, UEs, and some examples of non-transitory computer-readable media may also include operations, features, components, or instructions for selecting a first set of candidate delay values ​​from a set of multiple candidate delay values ​​based on the frequency band associated with the broadcast channel.

[0013] In some examples of the methods, UEs, and nontransitory computer-readable media described herein, the first delay value may be based on a basic time unit associated with the broadcast channel.

[0014] The methods described herein, examples of UEs, and non-transitory computer-readable media may also include operations, features, components, or instructions for calculating a delay spread limit value based on the first delay value, wherein the channel estimation may be performed based on the delay spread limit value.

[0015] The methods described herein, UEs, and some examples of nontransitory computer-readable media may also include operations, features, components, or instructions for determining a delay spread distribution associated with the multipath distribution based on the first delay value, wherein the channel estimation may be performed based on the delay spread distribution.

[0016] The methods described herein, UEs, and some examples of nontransitory computer-readable media may also include operations, features, components, or instructions for: obtaining a second delay value associated with the low-delay CDD scheme for scheduling a set of control resources via the broadcast channel; performing channel estimation for the control resource set based on the second delay value; and receiving control messages via the control resource set based on the channel estimation performed for the control resource set.

[0017] In some examples of the methods, UEs, and nontransitory computer-readable media described herein, obtaining the second delay value may include operations, features, components, or instructions for selecting the second delay value based on the first delay value, such that the first delay value and the second delay value may be the same.

[0018] In some examples of the methods, UEs, and nontransitory computer-readable media described herein, receiving the message via the broadcast channel may include operations, features, components, or instructions for: receiving the message indicating the second delay value, wherein determining the second delay value may be based on receiving the message.

[0019] In some examples of the methods, UEs, and non-transitory computer-readable media described herein, the control resource set includes a default control resource set, and the control message scheduler sends system information blocks.

[0020] In some examples of the methods, UEs, and nontransitory computer-readable media described herein, obtaining the first delay value may include operations, features, components, or instructions for receiving a control message that schedules the message via the broadcast channel, wherein the control message indicates the first delay value.

[0021] In some examples of the methods, UEs, and non-transitory computer-readable media described herein, the control message indicates a bit value, and the first delay value may be selected from a set of candidate delay values ​​associated with the broadcast channel based on that bit value.

[0022] The methods described herein, some examples of UEs and non-transitory computer-readable media may also include operations, features, components or instructions for selecting a set of candidate delay values ​​based on the frequency band associated with the broadcast channel.

[0023] A method for wireless communication by a UE is described. The method may include: receiving a first control message indicating a set of multiple candidate delay values ​​associated with a small delay CDD scheme for a channel; receiving a second control message indicating delay values ​​from the set of multiple candidate delay values ​​applied to the scheduled message; performing channel estimation for the channel based on one or more delay spread values ​​associated with a multipath distribution of the channel, wherein the one or more delay spread values ​​are based on the delay values ​​applied to the scheduled message; and receiving the scheduled message based on the channel estimation.

[0024] A UE for wireless communication is described. The UE may include one or more memories storing processor-executable code and one or more processors coupled to the one or more memories. The one or more processors may operate individually or jointly to execute the code such that the UE: receives a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for a channel; receives a second control message indicating a delay value from the set of multiple candidate delay values ​​applied to the scheduled message; performs channel estimation for the channel based on one or more delay spread values ​​associated with a multipath distribution of the channel, wherein the one or more delay spread values ​​are based on the delay value applied to the scheduled message; and receives the scheduled message based on the performance of the channel estimation.

[0025] Another UE for wireless communication is described. The UE may include: components for receiving a first control message indicating a set of multiple candidate delay values ​​associated with a low-delay CDD scheme for a channel; components for receiving a second control message indicating a delay value from the set of multiple candidate delay values ​​applied to the scheduled message; components for performing channel estimation for the channel based on one or more delay spread values ​​associated with the multipath distribution of the channel, wherein the one or more delay spread values ​​are based on the delay value applied to the scheduled message; and components for receiving the scheduled message based on performing the channel estimation.

[0026] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by one or more processors to perform the following actions: receiving a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for a channel; receiving a second control message indicating a delay value from the set of multiple candidate delay values ​​applied to the scheduled message; performing channel estimation for the channel based on one or more delay spread values ​​associated with a multipath distribution of the channel, wherein the one or more delay spread values ​​are based on the delay value applied to the scheduled message; and receiving the scheduled message based on performing the channel estimation.

[0027] In some examples of the methods described herein, UEs, and non-transitory computer-readable media, the first control message includes a radio resource control (RRC) message.

[0028] In some examples of the methods described herein, UEs, and non-transitory computer-readable media, the second control message includes a Media Access Control-Control Element (MAC-CE) message.

[0029] The methods described herein, UEs, and some examples of nontransitory computer-readable media may also include operations, features, components, or instructions for receiving a third control message indicating an active set of delay values ​​from a set of multiple candidate delay values, prior to receiving the second control message, wherein the active set of delay values ​​includes the delay value, and wherein the active set of delay values ​​can be mapped to code points in the downlink control information field of the second control message.

[0030] In some examples of the methods, UEs, and nontransitory computer-readable media described herein, receiving the second control message may include operations, features, components, or instructions for the following actions: receiving the second control message including the downlink control information field, the downlink control information field indicating the delay value selected from the set of active delay values.

[0031] In some examples of the methods, UEs, and non-transitory computer-readable media described herein, the second control message includes a downlink control message, and the third control message includes a MAC-CE message.

[0032] In some examples of the methods described herein, UEs, and non-transitory computer-readable media, the first control message, the second control message, or both may be sent as part of a transmission configuration indicator (TCI) instruction process.

[0033] A method for wireless communication by a network entity is described. The method may include: obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel; outputting an indication of the first delay value, wherein the first delay value is associated with a channel estimate for the broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, and wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme; and outputting a message via the broadcast channel based on the indication of the first delay value.

[0034] A network entity for wireless communication is described. The network entity may include one or more memories storing processor-executable code and one or more processors coupled to the one or more memories. The one or more processors may operate individually or collectively to execute the code to cause the network entity to: obtain a first delay value associated with a low-delay CDD scheme for a broadcast channel; output an indication of the first delay value, wherein the first delay value is associated with a channel estimate for the broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, and wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme; and output a message via the broadcast channel based on the indication of the first delay value.

[0035] Another network entity for wireless communication is described. This network entity may include: components for obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel; components for outputting an indication of the first delay value, wherein the first delay value is associated with a channel estimate for the broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, and wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme; and components for outputting a message via the broadcast channel based on the indication of the first delay value.

[0036] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by one or more processors to: obtain a first delay value associated with a low-delay CDD scheme for a broadcast channel; output an indication of the first delay value, wherein the first delay value is associated with a channel estimate for the broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, and wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme; and output a message via the broadcast channel based on the indication of the first delay value.

[0037] In some examples of the methods, network entities, and nontransitory computer-readable media described herein, obtaining the first delay value may include operations, features, components, or instructions for selecting the first delay value from a first set of candidate delay values ​​associated with the broadcast channel.

[0038] The methods, network entities, and some examples of nontransitory computer-readable media described herein may also include operations, features, components, or instructions for selecting a first set of candidate delay values ​​from a set of multiple candidate delay values ​​based on the frequency band associated with the broadcast channel.

[0039] In some examples of the methods, network entities, and non-transitory computer-readable media described herein, the first delay value may be determined based on the basic time unit associated with the broadcast channel.

[0040] Some examples of the methods, network entities, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for: obtaining a second delay value associated with the low-delay CDD scheme for scheduling a set of control resources via the broadcast channel; outputting an indication of the second delay value, wherein the second delay value may be associated with a channel estimate for the set of control resources; and obtaining control messages via the set of control resources based on the output of the indication of the second delay value.

[0041] In some examples of the methods, network entities, and nontransitory computer-readable media described herein, obtaining the second delay value may include operations, features, components, or instructions for selecting the second delay value based on the first delay value, such that the first delay value and the second delay value may be the same.

[0042] In some examples of the methods, network entities, and nontransitory computer-readable media described herein, outputting the message via the broadcast channel may include operations, features, components, or instructions for the following actions: outputting the message indicating the second delay value, wherein outputting the indication of the second delay value includes outputting the message via the broadcast channel.

[0043] In some examples of the methods, network entities, and non-transitory computer-readable media described herein, the control resource set includes a default control resource set, and the control message scheduling system information block is sent.

[0044] In some examples of the methods, network entities, and nontransitory computer-readable media described herein, the output of the indication of the first delay value may include an operation, feature, component, or instruction for outputting a control message scheduling the message via the broadcast channel, wherein the control message indicates the first delay value.

[0045] In some examples of the methods, network entities, and nontransitory computer-readable media described herein, the control message indicates a bit value, and the first delay value may be selected from a set of candidate delay values ​​associated with the broadcast channel based on that bit value.

[0046] The methods, network entities, and some examples of nontransitory computer-readable media described herein may also include operations, features, components, or instructions for selecting a set of candidate delay values ​​based on the frequency band associated with the broadcast channel.

[0047] A method for wireless communication by a network entity is described. The method may include: outputting a first control message indicating a set of multiple candidate delay values ​​associated with a small delay CDD scheme for a channel; outputting a second control message indicating, for a scheduled message, the delay value from the set of multiple candidate delay values ​​applied to the scheduled message; and outputting the scheduled message based on the output of the second control message.

[0048] A network entity for wireless communication is described. The network entity may include one or more memories storing processor-executable code and one or more processors coupled to the one or more memories. The one or more processors may operate individually or jointly to execute the code such that the network entity: outputs a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for a channel; outputs a second control message indicating, for a scheduled message, the delay value from the set of multiple candidate delay values ​​applied to the scheduled message; and outputs the scheduled message based on the output of the second control message.

[0049] Another network entity for wireless communication is described. This network entity may include: components for outputting a first control message indicating a set of multiple candidate delay values ​​associated with a low-delay CDD scheme for a channel; components for outputting a second control message indicating the delay value from the set of multiple candidate delay values ​​applied to the scheduled message; and components for outputting the scheduled message based on the output of the second control message.

[0050] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by one or more processors to: output a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for a channel; output a second control message indicating, for a scheduled message, the delay value from the set of multiple candidate delay values ​​applied to the scheduled message; and output the scheduled message based on the output of the second control message.

[0051] In some examples of the methods, network entities, and non-transitory computer-readable media described herein, the first control message includes an RRC message.

[0052] In some examples of the methods, network entities, and non-transitory computer-readable media described herein, the second control message includes a MAC-CE message.

[0053] Some examples of the methods, network entities, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for outputting a third control message indicating an active set of delay values ​​from a set of multiple candidate delay values, prior to outputting the second control message, wherein the active set of delay values ​​can be mapped to code points in the downlink control information field of the second control message.

[0054] In some examples of the methods, network entities, and nontransitory computer-readable media described herein, outputting the second control message may include operations, features, components, or instructions for the following actions: outputting the second control message including the downlink control information field, the downlink control information field indicating the delay value selected from the set of active delay values.

[0055] In some examples of the methods, network entities, and nontransitory computer-readable media described herein, the second control message includes a downlink control message, and the third control message includes a MAC-CE message.

[0056] In some examples of the methods, network entities, and non-transitory computer-readable media described herein, the first control message, the second control message, or both may be output as part of a TCI instruction process. Attached Figure Description

[0057] Figure 1 An example of a wireless communication system supporting low-delay CDD for data or control channels is shown, according to one or more aspects of this disclosure.

[0058] Figure 2 An example of a wireless communication system supporting low-delay CDD for data or control channels is shown, according to one or more aspects of this disclosure.

[0059] Figure 3 An example of a process flow for low-delay CDD for data or control channels is shown, according to one or more aspects of this disclosure.

[0060] Figure 4 An example of a process flow for low-delay CDD for data or control channels is shown, according to one or more aspects of this disclosure.

[0061] Figure 5 and Figure 6 A block diagram of an apparatus for low-latency CDD for data or control channels is shown, according to one or more aspects of this disclosure.

[0062] Figure 7 A block diagram is shown that supports a communication manager for low-latency CDD for data or control channels, according to one or more aspects of this disclosure.

[0063] Figure 8 A diagram of a system including a device supporting low-delay CDD for data or control channels is shown, according to one or more aspects of this disclosure.

[0064] Figure 9 and Figure 10 A block diagram of an apparatus for low-latency CDD for data or control channels is shown, according to one or more aspects of this disclosure.

[0065] Figure 11 A block diagram is shown that supports a communication manager for low-latency CDD for data or control channels, according to one or more aspects of this disclosure.

[0066] Figure 12 A diagram of a system including a device supporting low-delay CDD for data or control channels is shown, according to one or more aspects of this disclosure.

[0067] Figures 13 to 16 A flowchart illustrating a method for supporting low-delay CDD for a data or control channel according to one or more aspects of this disclosure is shown. Detailed Implementation

[0068] In some systems, UEs may experience unreliable communication due to fading or interference (e.g., in high-mobility scenarios). To improve signal quality and reliability, wireless communication systems can support diversity schemes, where messages can be transmitted to the UE via multiple signal paths. In some cases, such as in low-delay CDD schemes, the multipath distribution of the channel can be associated with one or more delay spread values, which are associated with transmission repetition. To enable the UE to successfully receive messages via the channel, the UE can perform channel estimation based on one or more delay spread values. However, the UE may not be aware of the delay spread values, which may depend on the channel distribution, modulation and decoding scheme, or resource allocation by network entities. Therefore, techniques for the UE to determine the delay spread values ​​used to perform channel estimation are desirable.

[0069] According to the examples described herein, the UE can determine a delay value for a low-delay CDD scheme. The UE can determine one or more delay spread values ​​associated with the multipath distribution of the channel based on the delay value, and the UE can then perform channel estimation based on the one or more delay spread values. In some examples, such as for the PBCH, the UE can be configured with a delay value based on a frequency band range or a range of delay values, and the UE can select the delay value based on the frequency band associated with the PBCH. In some cases, the delay value of the downlink control channel (e.g., CORESET 0) that schedules the SIB (e.g., SIB1) can be the same as the delay value of the PBCH. Additionally or alternatively, the UE can receive an indication of the delay value for the downlink control channel via the PBCH. In some examples, for a broadcast data channel (e.g., SIB), the corresponding delay value can be indicated by the downlink control channel that schedules the broadcast data channel, and this delay value can be selected from a set of frequency band-specific delay values. In some examples, such as for CSS, USS, or unicast data channels, the UE may receive a first control message indicating a set of candidate delay values, and a second control message indicating an active delay value for performing channel estimation. Thus, the UE can obtain delay values ​​corresponding to different channel types, and the UE can perform channel estimation accordingly to successfully receive messages.

[0070] The various aspects of this disclosure are first described in the context of a wireless communication system. A process flow diagram further illustrates the various aspects of this disclosure. Apparatus diagrams, system diagrams, and flowcharts relating to small-delay CDD for data or control channels are further illustrated and described with reference to them.

[0071] Figure 1 An example of a wireless communication system 100 supporting low-latency CDD for data or control channels is shown according to one or more aspects of this disclosure. The wireless communication system 100 may include one or more network entities 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating under other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.

[0072] Network entity 105 may be distributed across a geographical area to form wireless communication system 100, and may include devices employing different forms or having different capabilities. In various examples, network entity 105 may be referred to as a network element, mobility element, radio access network (RAN) node, or network equipment, etc. In some examples, network entity 105 and UE 115 may wirelessly communicate via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, network entity 105 may support coverage area 110 (e.g., a geographical coverage area) within which UE 115 and network entity 105 may establish one or more communication links 125. Coverage area 110 may be an example of a geographical area within which network entity 105 and UE 115 may support the transmission of signals according to one or more radio access technologies (RATs).

[0073] UE 115 can be distributed throughout the coverage area 110 of wireless communication system 100, and each UE 115 can be stationary or mobile, or stationary and mobile at different times. UE 115 can be devices in different forms or with different capabilities. Figure 1 Some example UE 115s are illustrated herein. The UE 115 described herein can be able to support various types of devices (such as, e.g., ...). Figure 1 It communicates with other UEs (115 or network entity 105) as shown.

[0074] As described herein, nodes of the wireless communication system 100 (which may be referred to as network nodes or wireless nodes) may be network entity 105 (e.g., any network entity described herein), UE 115 (e.g., any UE described herein), network controller, apparatus, device, 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 UE 115. Alternatively, a node may be network entity 105. Furthermore, a first node may be configured to communicate with a second or third node. In one aspect of this example, the first node may be UE 115, the second node may be network entity 105, and the third node may be UE 115. In another aspect of this example, the first node may be UE 115, the second node may be network entity 105, and the third node may be network entity 105. In other aspects of this example, the first node, the second node, and the third node may be different from these examples. Similarly, references to UE 115, network entity 105, device, equipment, computing system, etc., may include disclosures of UE 115, network entity 105, device, equipment, computing system, etc., as nodes. For example, a disclosure that UE 115 is configured to receive information from network entity 105 also discloses that a first node is configured to receive information from a second node.

[0075] In some examples, network entity 105 may communicate with core network 130, communicate with each other, or both. For example, network entity 105 may communicate with core network 130 via one or more backhaul communication links 120 (e.g., according to S1, N2, N3, or other interface protocols). In some examples, network entities 105 may communicate with each other directly (e.g., directly between network entities 105) or indirectly (e.g., via core network 130) via backhaul communication links 120 (e.g., according to X2, Xn, or other interface protocols). In some examples, network entities 105 may communicate with each other via midhaul communication link 162 (e.g., according to midhaul interface protocol) or fronthaul communication link 168 (e.g., according to fronthaul interface protocol) or any combination thereof. Backhaul communication link 120, midhaul communication link 162, or fronthaul communication link 168 may be or include one or more wired links (e.g., electrical links, fiber optic links), one or more wireless links (e.g., radio links, wireless optical links), etc., or various combinations thereof. UE 115 can communicate with core network 130 via communication link 155.

[0076] One or more network entities in network entity 105 described herein may include or be referred to as base station 140 (e.g., transceiver base station, radio base station, NR base station, access point, radio transceiver, node B, evolved node B (eNodeB, eNB), next-generation node B or gigabit node B (any of which may be referred to as gNB), 5G NB, next-generation eNB (ng-eNB), home node B, home evolved node B, or other suitable terms). In some examples, network entity 105 (e.g., base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture that may be configured to utilize a protocol stack that is physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as base station 140).

[0077] In some examples, network entity 105 may be implemented in a decomposed architecture (e.g., a decomposed base station architecture, a decomposed RAN architecture) that can be configured to utilize protocol stacks physically or logically distributed across two or more network entities 105 (such as an Integrated Access Backhaul (IAB) network, an Open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a Virtualized RAN (vRAN) (e.g., a Cloud RAN (C-RAN))). For example, network entity 105 may include one or more of the following: a Central Unit (CU) 160, a Distributed Unit (DU) 165, a Radio Unit (RU) 170, a RAN Intelligent Controller (RIC) 175 (e.g., a near real-time RIC (near RT RIC), a non-real-time RIC (non-RT RIC)), a Service Management and Orchestration (SMO) 180 system, or any combination thereof. RU 170 may also be referred to as a radio headend, an intelligent radio headend, a remote radio headend (RRH), a remote radio unit (RRU), or a transmit / receive point (TRP). One or more components of network entity 105 in a decomposed RAN architecture may be co-located, or one or more components of network entity 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 in a decomposed RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0078] The functional splitting among CU 160, DU 165, and RU 170 is flexible and can support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at CU 160, DU 165, or RU 170. For example, a protocol stack functional splitting can be used between CU 160 and DU 165, allowing CU 160 to support one or more layers of the protocol stack, and DU 165 to support one or more different layers of the protocol stack. In some examples, CU 160 can host higher protocol layer (e.g., Layer 3 (L3), Layer 2 (L2)) functionalities and signaling (e.g., RRC, Service Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP)). CU 160 can connect to one or more DU 165 or RU 170, and one or more DU 165 or RU 170 can 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 each can be at least partially controlled by CU 160. Additionally or alternatively, a protocol stack functional split can be employed between DU 165 and RU 170, such that DU 165 can support one or more layers of the protocol stack, and RU 170 can support one or more different layers of the protocol stack. DU 165 can support one or more different cells (e.g., via one or more RU 170). In some cases, functional decomposition between CU 160 and DU 165, or between DU 165 and RU 170, can be performed within the protocol layer (e.g., some functions of the protocol layer can be performed by one of CU 160, DU 165, or RU 170, while other functions of the protocol layer can be performed by different of CU 160, DU 165, or RU 170). CU 160 can be further functionally decomposed into CU control plane (CU-CP) functions and CU user plane (CU-UP) functions. CU 160 can be connected to one or more DU 165 via midhaul communication link 162 (e.g., F1, F1-c, F1-u), and DU 165 can be connected to one or more RU 170 via fronthaul communication link 168 (e.g., open fronthaul (FH) interface). In some examples, the midhaul communication link 162 or the fronthaul communication link 168 may be implemented based on the interfaces (e.g., channels) between the layers of the protocol stack, which are supported by the corresponding network entities 105 communicating via such communication links.

[0079] In a wireless communication system (e.g., wireless communication system 100), the infrastructure and spectrum resources for radio access can support wireless backhaul link capabilities to supplement wired backhaul connections, thereby providing an IAB network architecture (e.g., to core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB node 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as donor entities or IAB donors. One or more DU 165s or one or more RU 170s may be partially controlled by one or more CU 160s associated with donor network entity 105 (e.g., donor base station 140). One or more donor network entities 105 (e.g., IAB donors) may communicate with one or more additional network entities 105 (e.g., IAB node 104) via supported access and backhaul links (e.g., backhaul communication link 120). IAB node 104 may include an IAB mobile terminal (IAB-MT) controlled (e.g., scheduled) by a DU 165 of a coupled IAB donor. The IAB-MT may include a separate set of antennas for relaying communication with UE 115, or may share the same antennas (e.g., those of RU 170) for access to IAB node 104 via DU 165 of IAB node 104. (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., IAB node 104, UE 115) within a relay chain or configuration (e.g., downstream) of the access network. In such cases, one or more components of the decomposed RAN architecture (e.g., one or more IAB nodes 104 or components of IAB node 104) may be configured to operate according to the techniques described herein.

[0080] When the techniques described herein are applied in the context of a decomposed RAN architecture, one or more components of the decomposed RAN architecture can be configured to support low-latency CDD for data or control channels as described herein. For example, some operations described as being performed by UE 115 or network entity 105 (e.g., base station 140) may additionally or alternatively be performed by one or more components of the decomposed RAN architecture (e.g., IAB node 104, DU 165, CU 160, RU 170, RIC 175, SMO 180).

[0081] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, wherein "device" may also be referred to as a cell, station, terminal, or client, etc. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, etc., which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0082] The UE 115 described herein can communicate with various types of devices, such as other UEs 115 that sometimes act as relays, network entities 105, and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc. Figure 1 As shown.

[0083] UE 115 and network entity 105 can wirelessly communicate with each other via one or more communication links 125 (e.g., access links) using resources associated with one or more carriers. The term "carrier" can refer to a set of RF spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of the RF spectrum band (e.g., a bandwidth portion (BWP)) operating according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating carrier operation, user data, or other signaling. Wireless communication system 100 can support communication with UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used in conjunction with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers. Communication between network entity 105 and other devices can refer to communication between these devices and any part of network entity 105 (e.g., entity, sub-entity). For example, the terms “send,” “receive,” or “communicate” when referring to network entity 105 can refer to any part of the RAN’s network entity 105 (e.g., base station 140, CU160, DU 165, RU 170) communicating with another device (e.g., directly or via one or more other network entities 105).

[0084] The signal waveform transmitted via a carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform extended OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element may refer to a resource of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing may be inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the decoding rate of the modulation scheme, or both), such that a relatively high number of resource elements (e.g., in the transmission duration) and a relatively high modulation scheme order may correspond to a relatively high communication rate. Wireless communication resources may refer to a combination of RF spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial resources may increase the data rate or data integrity used for communication with UE 115.

[0085] The time interval for network entity 105 or UE 115 can be expressed as a multiple of a basic time unit, such as the sampling period. seconds, of which It can represent the supported subcarrier spacing, and The supported Discrete Fourier Transform (DFT) size can be represented. The time interval of the communication resource can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0086] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may (e.g., in the time domain) be divided into subframes, and each subframe may be further divided into a number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix appended to each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple micro-time slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., The duration of a symbol period is associated with a (number) sampling period. The duration of a symbol period can depend on the subcarrier spacing or the operating frequency band.

[0087] A subframe, time slot, micro-time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in a burst of shortened TTIs (sTTIs)).

[0088] Depending on the technology, carriers can be used to multiplex physical channels for communication. One or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques can be used, for example, to multiplex physical control channels and physical data channels for signaling via a downlink carrier. The control region (e.g., control resource set (CORESET)) of the physical control channel can be defined by a set of symbol periods and can extend across the system bandwidth of the carrier or a subset of that bandwidth. One or more control regions (e.g., CORESET) can be configured for a set of UEs 115. For example, one or more UEs in UE 115 can monitor or search for control regions to obtain control information based on one or more search space sets, and each search space set can include one or more control channel candidates in one or more aggregation levels arranged in a concatenated manner. The aggregation level of control channel candidates can refer to the amount of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space set may include: a common search space set configured to transmit control information to multiple UEs 115, and a UE-specific search space set used to transmit control information to a specific UE 115.

[0089] In some examples, network entity 105 (e.g., base station 140, RU 170) may be mobile, and thus provide communication coverage to mobile coverage areas 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of network entities 105 use the same or different radio access technologies to provide coverage for various coverage areas 110.

[0090] Wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC). UE 115 may be designed to support ultra-reliable or low-latency or critical functions. Ultra-reliable communication may include private 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 business applications. The terms “ultra-reliable,” “low-latency,” and “ultra-reliable low-latency” are used interchangeably herein.

[0091] In some examples, UE 115 may be configured to support direct communication with other UE 115s via device-to-device (D2D) communication link 135 (e.g., according to peer-to-peer (P2P), D2D, or sidelink protocols). In some examples, one or more UE 115s performing D2D communication in a group may be within the coverage area 110 of network entity 105 (e.g., base station 140, RU 170), which may support aspects of such D2D communication configured (e.g., scheduled by network entity 105). In some examples, one or more UE 115s in such a group may be outside the coverage area 110 of network entity 105, or may otherwise be unable or not configured to receive transmissions from network entity 105. In some examples, the group of UE 115s communicating via D2D communication may support a one-to-many (1:M) system, where each UE 115 transmits to each of the other UE 115s in the group. In some examples, network entity 105 may facilitate the scheduling of resources used for D2D communication. In other examples, D2D communication may be performed between UEs 115 without involving network entity 105.

[0092] Core network 130 provides user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), access and mobility management function (AMF)) for managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), packet data network (PDN) gateway (P-GW), or user plane function (UPF)) for routing packets or interconnecting to external networks. The control plane entity manages non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by network entity 105 (e.g., base station 140) associated with core network 130. User IP packets can be delivered through the user plane entity, which provides IP address allocation and other functions. The user plane entity may connect to one or more network operator IP services 150. IP services 150 may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0093] Wireless communication system 100 can operate using one or more frequency bands in the range of 300 MHz to 300 GHz. Generally, the area from 300 MHz to 3 GHz is referred to as the Ultra High Frequency (UHF) band or decimeter band because the wavelength range is 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 these waves are sufficient to penetrate structures so that macrocells can provide service to UE 115 located indoors. Compared to communication using smaller frequencies and longer wavelengths in the lower frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz, communication using UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0094] Wireless communication system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, wireless communication system 100 may use unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band) to employ Licensed Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technology. When operating with unlicensed RF spectrum, devices such as network entity 105 and UE 115 may employ carrier sensing for collision detection and avoidance. In some examples, operation using unlicensed frequency bands may be combined with component carriers operating with licensed frequency bands based on carrier aggregation configurations (e.g., LAA). Operation using unlicensed spectrum may include downlink transmission, uplink transmission, P2P transmission, or D2D transmission, etc.

[0095] Network entity 105 (e.g., base station 140, RU 170) or UE 115 may be equipped with multiple antennas that can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of network entity 105 or UE 115 may be located within one or more antenna arrays or antenna panels, which can support MIMO operation 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, the antennas or antenna arrays associated with network entity 105 may be located at different geographical locations. Network entity 105 may include an antenna array having a collection of multiple rows and columns of antenna ports that network entity 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may include one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals transmitted via the antenna ports.

[0096] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., network entity 105, UE 115) to shape or guide an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array such that some signals propagating along a specific orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to the signals transmitted via the antenna elements may include applying amplitude shifts, phase shifts, or both to the signals carried via the antenna elements associated with the device by the transmitting or receiving device. The adjustments associated with each of these antenna elements may be defined by a beamforming weight set associated with a specific orientation (e.g., relative to the antenna array of the transmitting or receiving device or relative to some other orientation).

[0097] In some examples, UE 115 may receive messages from network entity 105 via one or more channels based on a diversity scheme. A diversity scheme can improve the reliability of communication, such as broadcast channels, by implementing signal diversity on the transmitted messages in terms of time, frequency, space, polarization, or combinations thereof. Since channels can experience fading or interference, this diversity scheme improves reliability compared to transmitting via a single channel at a single time. In some cases, the diversity scheme can be used before establishing an RRC connection between UE 115 and network entity 105, or as a fallback in situations with unreliable feedback (e.g., Channel State Information (CSI) feedback), such as in high mobility scenarios. Diversity schemes can support improved performance while incurring relatively low overhead (e.g., demodulation reference signal (DMRS) overhead).

[0098] In some cases, UE 115 can utilize transparent diversity schemes (e.g., involving Physical Resource Block Group (PRG) level pre-decoder cycles, transparent small-delay CDD, or both). However, transparent diversity schemes may not achieve such high levels of diversity compared to non-transparent diversity schemes (such as Space Frequency Block Decoding (SFBC) or Long-Delay CDD), which can reduce network coverage. When operating with dual-port MIMO, the SFBC scheme can support full rate and full diversity, and the Long-Delay CDD can support decoding diversity schemes that can benefit from frequency selectivity (e.g., two-port or four-port, up to rank-4). In some examples, in massive MIMO setups, two ports can be selected from two different antenna polarizations or subarrays for these schemes.

[0099] However, in some examples, SFBC and long-delay CDD schemes may not be supported in some channels (e.g., data channels). For example, the number of antenna ports can be very large because these schemes can use at least two antenna ports to transmit a single layer, and some channels (e.g., NR channels) can use multi-layer spatial modulation (SM) transmission. Additionally or alternatively, having multiple transmission schemes and inconsistencies between signals transmitted via channels and DMRS transmission can lead to complex implementations at UE 115 and limit the application of interference-aware advanced receivers. Therefore, establishing non-transparent diversity schemes, such as non-transparent small-delay CDD schemes, may be beneficial. Small-delay CDD schemes can rely on shorter delays compared to long-delay CDD. In some cases, the delay associated with a small-delay CDD scheme can be shorter than the cyclic prefix length, while the delay associated with a long-delay CDD can be greater than the cyclic prefix length.

[0100] In some examples, to implement the CDD scheme, UE 115 can determine a delay limit (e.g., maximum delay) based on a limit delay CDD value (e.g., maximum CDD value) after applying the CDD scheme. For example, the delay limit after applying the CDD scheme can be given by Equation 1 below:

[0101] Limit delay (1)

[0102] in This represents the limit (e.g., maximum, highest) CDD value associated with the CDD scheme. It is the limit (e.g., maximum) channel delay represented by samples. It is the number of data symbols associated with the channel, and This refers to the sampling rate. UE 115 can calculate the effective channel (e.g., based on the CDD value) The pre-decoding vector can be computed based on the effective channel, and in some examples, the pre-decoding vector for the CDD scheme can be equivalent to a resource element-level pre-decoder loop.

[0103] In some examples, the CDD value (e.g., the optimal CDD value) may depend on the channel distribution (e.g., multipath channel distribution), the modulation and decoding scheme associated with the channel (e.g., which may be based on the signal-to-noise ratio (SNR)), and the resource allocation for the channel. In some cases, if the UE 115 is unaware of the CDD value, the performance of the CDD scheme may be sensitive to the chosen delay value. Therefore, the CDD value may be limited to a small range of values, which can limit the diversity gain.

[0104] In a transparent CDD scheme, UE 115 can derive the Power Delay Distribution (PDP) window based on the received TRS without CDD application. Therefore, UE 115 can determine the PDP window for receiving messages. In some cases, such as in low-delay CDD transmissions, UE 115 may underestimate the PDP window size. In some examples, a scheme (e.g., Scheme 1) may be supported, which may include multiple Tracking Reference Signal (TRS) resources specific to that scheme. In some cases, such as for Scheme 1, the channel traversed by the TRS may already include the additional delay added by CDD, but this may increase TRS resource overhead, potentially increasing the complexity of the scheduler at network entity 105. Therefore, techniques are expected for UE 115 to determine CDD delay values ​​for different transmission types.

[0105] According to the examples described herein, UE 115 can determine a delay value for a low-delay CDD scheme (e.g., a non-transparent low-delay CDD scheme). UE 115 can determine one or more delay spread values ​​associated with the multipath distribution of the channel based on the delay value, and UE 115 can then perform channel estimation based on the one or more delay spread values. In some examples, such as for the PBCH, UE 115 can be configured with a delay value based on a frequency band range or a range of delay values, and UE 115 can select a delay value based on the frequency band associated with the PBCH. In some cases, the delay value of the downlink control channel (e.g., CORESET 0) that schedules the SIB (e.g., SIB1) can be determined based on the CDD value of the PBCH. In some examples, such as for CSS, USS, or for unicast data channels, UE 115 can receive a first control message indicating a set of candidate delay values, and a second control message indicating an active delay value for performing channel estimation. Therefore, UE 115 can obtain delay values ​​corresponding to different channel types, and UE 115 can perform channel estimation accordingly to successfully receive messages.

[0106] Figure 2 An example of a wireless communication system 200 supporting low-delay CDD for data or control channels is shown, according to one or more aspects of this disclosure. The wireless communication system 200 illustrates communication between network entity 105-a and UE 115-a, which can be as described in reference... Figure 1 Examples of the corresponding devices described.

[0107] In some examples, as described herein, network entity 105-a and UE 115-a may communicate according to a low-latency CDD scheme (e.g., non-transparent low-latency CDD). UE 115-a may determine a CDD delay value 205 associated with the low-latency CDD scheme, and UE 115-a may perform channel estimation for a channel based on the CDD delay value 205. Network entity 105-a may select a CDD delay value 205 for different channels used to communicate with UE 115-a, and UE 115-a may perform channel estimation for each channel based on the corresponding CDD delay value 205.

[0108] In some examples, to perform channel estimation, UE 115-a may use the CDD delay value 205 to determine a delay spread limit (e.g., a maximum delay spread value). Additionally or alternatively, UE 115-a may calculate a delay spread distribution associated with the channel (e.g., a delay distribution including one or more delay values) based on the CDD delay value 205, and UE 115-a may perform channel estimation based on the delay spread limit value, the delay spread distribution, or both. Therefore, UE 115-a may receive message 220 via the corresponding channel based on performing channel estimation for the channel.

[0109] In some cases, the CDD delay value 205 may depend on channel distribution, SNR, bandwidth associated with the channel, or a combination thereof. For example, UE 115-a may be configured with a set of one or more candidate CDD values ​​210 (e.g., candidate CDD delay values), and UE 115-a may select the CDD delay value 205 from the candidate CDD values ​​210 based on channel distribution, SNR, bandwidth, or other parameters. In some cases, the candidate CDD values ​​210 may be indicated by network entity 105-a via control message 215-a (e.g., RRC message). In some cases, network entity 105-a may send control message 215-b to indicate the CDD delay value 205 from the candidate CDD values ​​210. In some examples, UE 115-a may determine the CDD delay value 205 for multiple different channels, as described herein, and UE 115-a may perform channel estimation for each channel accordingly.

[0110] In some examples, such as for performing channel estimation for the PBCH, UE 115-a may select a CDD delay value 205 from a range of CDD delay values. In some cases, UE 115-a may be configured with multiple ranges of CDD delay values, and UE 115-a may select the range based on the frequency band associated with the PBCH. In some examples, lower frequency ranges may be associated with higher delay values, and vice versa. As a non-limiting example, UE 115-a may be configured with the following range of CDD values ​​that vary with the frequency band:

[0111] For frequency band < , ;

[0112] for and The frequency band between ;as well as

[0113] For frequency band > , .

[0114] Within these ranges, The basic unit of time associated with PBCH (e.g., scale size) can be represented and can be given by the following equation 2:

[0115] (2)

[0116] in It is the limiting (e.g., maximum) subcarrier spacing (e.g., 480 kHz in some systems) and This is the limiting (e.g., maximum) Fast Fourier Transform size (e.g., 4096 in some systems). Therefore, UE 115-a can select a CDD delay value 205 from a range of CDD values ​​based on the frequency band associated with the PBCH, and perform channel estimation on the PBCH to receive message 220 via the PBCH.

[0117] In some examples, such as for receiving a control resource set (e.g., a default control set, such as CORESET 0), UE 115-a may determine a CDD delay value 205 based on the PBCH. For example, UE 115-a may apply the same CDD delay value 205 determined for the PBCH to a channel estimate for the control resource set. Additionally or alternatively, network entity 105-a may indicate the CDD delay value 205 corresponding to the channel estimate for the control resource set via the PBCH (e.g., via a Master Information Block (MIB) transmitted via the PBCH). Thus, UE 115-a may perform channel estimation and receive the control resource set. In some cases, the control resource set (e.g., CORESET 0) may include downlink control channel messages (e.g., control message 215) scheduled to be transmitted by the SIB (e.g., SIB1).

[0118] In some examples, such as to perform channel estimation for a broadcast downlink shared channel (e.g., a physical downlink shared channel (PDSCH)) (e.g., an SIB), UE 115-a may obtain the CDD delay value 205 to be used via a downlink control message (e.g., a physical downlink control channel (PDCCH) message, control message 215) that schedules the broadcast downlink shared channel. For example, UE 115-a may receive the downlink control message via a control resource set (e.g., a CORESET) that schedules the SIB, and the downlink control message may include an indication of the CDD delay value 205 for the SIB. In some examples, UE 115-a may be configured with a set of candidate CDD values ​​210, and the downlink control message that schedules the broadcast downlink shared channel may include one or more bits indicating the CDD delay value 205 from the set of candidate CDD values ​​210. For example, UE 115-a may be configured with a set of candidate CDD values ​​210 that varies based on the frequency band associated with the broadcast downlink shared channel. Table 1 illustrates examples of these candidate CDD values ​​of 210, where This indicates the frequency band associated with downlink control messages (e.g., or broadcast downlink shared channels), although values ​​other than those shown are possible.

[0119] Table 1: Candidate CDD values ​​for broadcast downlink shared channels 210

[0120]

[0121] Therefore, the downlink control message scheduling the downlink broadcast shared channel message can indicate a bit value corresponding to one of the candidate CDD values ​​210, and UE 115-a can determine the CDD delay value 205 based on the frequency band associated with the broadcast downlink shared channel (e.g., the frequency band in which UE 115-a operates to monitor the broadcast downlink shared channel). Thus, UE 115-a can perform channel estimation for the downlink broadcast shared channel and receive the corresponding message. In some cases, one or more bit values ​​can indicate to UE 115-a that CDD is not applied to transmission. Therefore, UE 115-a can perform channel estimation without considering CDD.

[0122] In some examples, network entity 105-a may indicate a CDD delay value 205 for CSS or USS to UE 115-a, or configure the UE using that CDD delay value. Network entity 105-a may send a control message 215-a that configures UE 115-a using a candidate CDD value 210 for CSS or USS transmission. In some examples, control message 215-a may be an RRC message. Network entity 105-a may then send a control message 215-b that indicates a CDD delay value 205 for CSS or USS transmission from the candidate CDD value 210. In some examples, control message 215-b may be a MAC-CE message.

[0123] In some cases, if UE 115-a does not receive the configuration of candidate CDD value 210, UE 115-a may determine (e.g., assume) that it will not send an execution CDD message to the CSS or USS. In some examples, control message 215-a, control message 215-b, or both may be associated with a TCI indication (e.g., a TCI status indication). For example, control message 215-a, control message 215-b, or both may be sent as part of the TCI indication process. Additionally or alternatively, an indication of candidate CDD value 210, CDD delay value 205, or both may be sent as part of the TCI indication process.

[0124] In some examples, network entity 105-a may indicate to UE 115-a a CDD delay value 205 for a unicast downlink sharing message (e.g., a unicast physical downlink shared channel (PDSCH) message) or use that CDD delay value to configure the UE. In some cases, network entity 105-a may send a control message 215-a that uses a candidate CDD value 210 for a unicast downlink sharing message to configure UE 115-a. In some examples, control message 215-a may be an RRC message. Network entity 105-a may then send a control message 215-b that indicates a subset of CDD values ​​from candidate CDD values ​​210, which can be mapped to code points in the downlink control information (DCI) field of a third downlink control message 215 (e.g., a PDCCH message). In some examples, control message 215-b may be a Media Access Control-Control Element (MAC-CE) message. Network entity 105-a may then send a third downlink control message 215, which may schedule unicast downlink sharing messages, and the third downlink control message 215 may include a DCI field indicating a CDD delay value 205 from a subset of CDD values ​​of candidate CDD values ​​210.

[0125] In some cases, a code point in the DCI field may be assigned as the default code point for backoff transmission. For example, if a downlink sharing message is transmitted without a DCI indication, UE 115-a may use the CDD delay value 205 corresponding to the default code point to perform channel estimation for receiving the downlink sharing message. Additionally or alternatively, if the third control message 215 does not include an indication of the CDD delay value 205, UE 115-a may use the CDD delay value 205 corresponding to the default code point. In some examples, control message 215-a (e.g., RRC message), control message 215-b (e.g., MAC-CE message), third control message 215 (e.g., PDCCH message), the indication of the CDD delay value 205, or any combination thereof, may be associated with a TCI indication for UE 115-a. For example, any control message in control message 215 may be transmitted as part of the TCI indication procedure, or the indication of the CDD delay value 205 may be included within the TCI indication.

[0126] Therefore, UE 115-a can determine the CDD delay value 205 to be used for performing channel estimation for various message types, such as PBCH transmission, control resource set transmission, broadcast PDSCH transmission, CSS and USS transmission, and unicast PDSCH transmission. Thus, network entity 105-a can increase diversity in sending messages 220, which improves the reliability of communication with UE 115-a.

[0127] Figure 3 An example of a process flow 300 supporting low-latency CDD for data or control channels, according to one or more aspects of this disclosure, is shown. Process flow 300 illustrates communication between network entity 105-b and UE 115-b, which may be as referenced herein. Figure 1 and Figure 2 Examples of corresponding devices described. In some examples, some steps shown in process flow 300 may be omitted or performed in a different order. Additionally or alternatively, some steps may be added to process flow 300.

[0128] At point 305, network entity 105-b may send a message to UE 115-b indicating a set of candidate CDD delay values. Additionally or alternatively, UE 115-b may be configured (e.g., previously configured, pre-configured) using the set of candidate CDD delay values ​​without receiving explicit indication from network entity 105-b. The candidate CDD delay values ​​may be associated with a low-delay CDD scheme for a broadcast channel (e.g., PBCH) to be used for communication between network entity 105-b and UE 115-b.

[0129] At 310, UE 115-b can obtain a first CDD delay value associated with a small-delay CDD scheme for the broadcast channel. In some examples, the first CDD delay value may be selected from a set of candidate CDD delay values ​​associated with the broadcast channel. In some cases, the first CDD delay value may be selected based on the frequency band associated with the broadcast channel. For example, UE 115-b may be configured with multiple candidate CDD values, and UE 115-b may select a subset of candidate CDD values ​​based on the frequency band associated with the broadcast channel. UE 115-b can then select the first CDD delay value from the subset of candidate CDD values. In some cases, the first CDD delay value may be determined by UE 115-b based on a basic time unit associated with the broadcast channel (e.g., ...). It is determined by ( ).

[0130] At 315, UE 115-b can perform channel estimation for the broadcast channel based on one or more delay spread values ​​associated with the multipath distribution of the broadcast channel. UE 115-b can determine one or more delay spread values ​​based on a first CDD delay value. In some examples, determining one or more delay spread values ​​may include calculating a delay spread limit value (e.g., a maximum delay spread value) based on the first CDD value, as referenced. Figure 2 As described. Additionally or alternatively, determining one or more delay spread values ​​may include determining the delay spread distribution (e.g., delay distribution) associated with the multipath distribution based on the first CDD value.

[0131] At 320, network entity 105-b can send messages via the broadcast channel. UE 115-b can receive messages via the broadcast channel based on performing channel estimation for the broadcast channel.

[0132] At 325, UE 115-b may obtain a second CDD delay value associated with a low-delay CDD scheme for a control resource set (e.g., CORESET, such as CORESET 0 or the default control resource set) that can be scheduled via a broadcast channel (e.g., via a MIB transmitted through the broadcast channel). In some examples, UE 115-b may select a second CDD delay value such that the second CDD delay value is the same as the first CDD delay value. Additionally or alternatively, a message received via the broadcast channel (e.g., or another message) may indicate the second CDD delay value.

[0133] At 330, UE 115-b may perform channel estimation for the control resource set based on the second CDD delay value. For example, UE 115-b may determine one or more delay spread values ​​based on the second CDD delay value. In some examples, determining one or more delay spread values ​​may include calculating a delay spread limit value (e.g., a maximum delay spread value) based on the second CDD delay value, or calculating a delay spread distribution (e.g., a delay distribution) associated with the multipath distribution of the control resource set based on the second CDD delay value.

[0134] At 335, UE 115-b may receive control messages (e.g., PDCCH) from network entity 105-b via a control resource set based on performing channel estimation for the control resource set. In some examples, the control message may schedule an SIB (e.g., broadcast a PDSCH, such as SIB1). In some cases, the control message may additionally indicate a third CDD delay value associated with a low-delay CDD scheme used for the SIB. In some examples, the control message may include a bit value indicating a third CDD delay value from a set of candidate CDD delay values ​​associated with the SIB. In some cases, UE 115-b may select the third CDD delay value based on the bit value and the frequency band associated with the SIB. UE 115-b may perform channel estimation for the SIB based on the third CDD delay value.

[0135] At 340, UE 115-b can receive SIBs based on performing channel estimation for SIBs (e.g., for broadcast PDSCH).

[0136] Figure 4 An example of process flow 400 supporting low-latency CDD for data or control channels is shown, according to one or more aspects of this disclosure. Process flow 300 illustrates communication between network entity 105-c and UE 115-c, which may be as referenced herein. Figures 1 to 3 Examples of corresponding devices described. In some examples, some steps shown in process flow 400 may be omitted or performed in a different order. Additionally or alternatively, some steps may be added to process flow 400.

[0137] At 405, network entity 105-c may send a first control message to UE 115-c, which may indicate a set of candidate CDD delay values ​​associated with a low-delay CDD scheme for the channel (e.g., CSS, USS, unicast PDSCH). In some examples, the first control message may be an example of an RRC message.

[0138] At 410, network entity 105-c may send an additional control message to UE 115-c, which may indicate the active set of delay values ​​from the set of candidate CDD delay values. In some examples, the additional control message may indicate a mapping of the active set of delay values ​​to code points in the DCI field of a second control message, which can be transmitted via a channel scheduling message. In some cases, the second control message may be a MAC-CE message.

[0139] At 415, network entity 105-c may send a second control message that indicates the CDD delay value applied to the scheduled message from a set of candidate CDD delay values. In some examples, the second control message may be a MAC-CE message. In some cases, if network entity 105-c sends an additional control message, the second control message may include a DCI field indicating the CDD delay value from the set of active delay values. In these cases, the second control message may be the PDCCH of the scheduled message.

[0140] At 420, UE 115-c may obtain the CDD delay value based on the receipt of the second control message. At 425, UE 115-c may perform channel estimation for the channel based on the CDD delay value. For example, UE 115-c may perform channel estimation based on a delay spread limit value (e.g., maximum delay spread value) based on the CDD delay value or a delay spread distribution (e.g., delay distribution) associated with the multipath distribution of the channel based on the CDD delay value.

[0141] At 430, UE 115-c can receive scheduled messages via the channel based on performing channel estimation for the channel.

[0142] Figure 5 A block diagram 500 of an apparatus 505 supporting low-delay CDD for data or control channels according to one or more aspects of this disclosure is shown. Apparatus 505 may be an example of various aspects of a UE 115 as described herein. Apparatus 505 may include a receiver 510, a transmitter 515, and a communication manager 520. Apparatus 505, or one or more components of apparatus 505 (e.g., receiver 510, transmitter 515, and communication manager 520), may include at least one processor that can be coupled to at least one memory to individually or jointly support or implement the described techniques. Each of these components may communicate with each other (e.g., via one or more buses).

[0143] Receiver 510 may provide components 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, or control channels associated with low-delay CDD for data or control channels). The information may be passed to other components of device 505. Receiver 510 may utilize a single antenna or a collection of antennas.

[0144] Transmitter 515 may provide components for transmitting signals generated by other components of device 505. For example, transmitter 515 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 associated with low-delay CDD for data or control channels). In some examples, transmitter 515 may be co-located with receiver 510 in a transceiver module. Transmitter 515 may utilize a single antenna or a collection of multiple antennas.

[0145] The communication manager 520, receiver 510, transmitter 515, or various combinations thereof, or various components thereof, may be examples of components used to perform various aspects of low-delay CDD for data or control channels as described herein. For example, the communication manager 520, receiver 510, transmitter 515, or various combinations thereof, or components thereof, may be able to perform one or more of the functions described herein.

[0146] In some examples, the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include at least one of the following: a processor, digital signal processor (DSP), central processing unit (CPU), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, microcontroller, discrete gate or transistor logic component, discrete hardware component, or any combination thereof, configured as or otherwise individually or collectively to support components for performing the functions described herein. In some examples, at least one processor and at least one memory coupled to said at least one processor may be configured to perform one or more of the functions described herein (e.g., instructions stored in at least one memory are executed individually or collectively by one or more processors).

[0147] Additionally or alternatively, the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be implemented in code executed by at least one processor (e.g., as communication management software or firmware). If implemented in code executed by at least one processor, the functionality of the communication manager 520, receiver 510, transmitter 515, or various combinations or components thereof may be performed by a general-purpose processor, DSP, CPU, ASIC, FPGA, microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise individually or jointly to support components for performing the functions described in this disclosure).

[0148] In some examples, the communication manager 520 may be configured to use a receiver 510, a transmitter 515, or both, or otherwise cooperate with them to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, the communication manager 520 may receive information from the receiver 510, transmit information to the transmitter 515, or be integrated in combination with the receiver 510, the transmitter 515, or both to acquire information, output information, or perform various other operations as described herein.

[0149] Communication manager 520 may support wireless communication according to examples disclosed herein. For example, communication manager 520 may be capable of, configured to, or operable to support components for obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel. Communication manager 520 may be capable of, configured to, or operable to support components for performing channel estimation for a broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme. Communication manager 520 may be capable of, configured to, or operable to support components for receiving messages via the broadcast channel based on performing channel estimation.

[0150] Additionally or alternatively, the communication manager 520 may support wireless communication according to the examples disclosed herein. For example, the communication manager 520 may be capable of, configured to, or operable to support components for receiving a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for a channel. The communication manager 520 may be capable of, configured to, or operable to support components for receiving a second control message indicating a delay value from the set of multiple candidate delay values ​​applied to a scheduled message. The communication manager 520 may be capable of, configured to, or operable to support components for performing channel estimation for a channel based on one or more delay spread values ​​associated with the multipath distribution of the channel, wherein the one or more delay spread values ​​are based on the delay value applied to the scheduled message. The communication manager 520 may be capable of, configured to, or operable to support components for receiving a scheduled message based on performing channel estimation.

[0151] By including or configuring a communication manager 520 according to an example as described herein, device 505 (e.g., at least one processor that controls or otherwise couples to receiver 510, transmitter 515, communication manager 520, or a combination thereof) can support techniques for low-delay CDD schemes for one or more channel types, which can increase channel diversity, thereby improving channel performance, reducing overhead (e.g., DMRS overhead), and improving communication stability between devices.

[0152] Figure 6 A block diagram 600 illustrates a device 605 supporting low-delay CDD for data or control channels according to one or more aspects of this disclosure. Device 605 may be an example of aspects of device 505 or UE 115 as described herein. Device 605 may include a receiver 610, a transmitter 615, and a communication manager 620. Device 605, or one or more components of device 605 (e.g., receiver 610, transmitter 615, and communication manager 620), may include at least one processor that can be coupled to at least one memory to support the described techniques. Each of these components may communicate with each other (e.g., via one or more buses).

[0153] Receiver 610 may provide components 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, or control channels associated with low-delay CDD for data or control channels). The information may be passed to other components of device 605. Receiver 610 may utilize a single antenna or a collection of antennas.

[0154] Transmitter 615 may provide components for transmitting signals generated by other components of device 605. For example, transmitter 615 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 associated with low-delay CDD for data or control channels). In some examples, transmitter 615 may be co-located with receiver 610 in a transceiver module. Transmitter 615 may utilize a single antenna or a collection of multiple antennas.

[0155] Device 605 or its various components may be examples of parts for performing various aspects of low-delay CDD for data or control channels as described herein. For example, communication manager 620 may include delay value component 625, channel estimation component 630, message component 635, candidate delay value component 640, or any combination thereof. Communication manager 620 may be examples of aspects of communication manager 520 as described herein. In some examples, communication manager 620 or its various components may be configured to use receiver 610, transmitter 615, or both, or otherwise cooperate with them to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, communication manager 620 may receive information from receiver 610, transmit information to transmitter 615, or be integrated in combination with receiver 610, transmitter 615, or both to acquire information, output information, or perform various other operations as described herein.

[0156] Communication manager 620 can support wireless communication according to examples disclosed herein. Delay value component 625 is capable of, configured to, or operable to support means for obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel. Channel estimation component 630 is capable of, configured to, or operable to support means for performing channel estimation for a broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme. Message component 635 is capable of, configured to, or operable to support means for receiving messages via the broadcast channel based on the performed channel estimation.

[0157] Additionally or alternatively, the communication manager 620 may support wireless communication according to the examples disclosed herein. The candidate delay value component 640 is capable of, configured to, or operable to support means for receiving a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for the channel. The delay value component 625 is capable of, configured to, or operable to support means for receiving a second control message indicating a delay value from the set of multiple candidate delay values ​​applied to the scheduled message. The channel estimation component 630 is capable of, configured to, or operable to support means for performing channel estimation for the channel based on one or more delay spread values ​​associated with the multipath distribution of the channel, wherein the one or more delay spread values ​​are based on the delay value applied to the scheduled message. The message component 635 is capable of, configured to, or operable to support means for receiving the scheduled message based on the performed channel estimation.

[0158] Figure 7 A block diagram 700 is shown of a communication manager 720 supporting small-delay CDD for data or control channels according to one or more aspects of this disclosure. The communication manager 720 may be an example of a communication manager 520, a communication manager 620, or aspects thereof as described herein. The communication manager 720 or its various components may be examples of parts for performing various aspects of small-delay CDD for data or control channels as described herein. For example, the communication manager 720 may include a delay value component 725, a channel estimation component 730, a message component 735, a candidate delay value component 740, or any combination thereof. Each of these components, or its components or sub-components (e.g., one or more processors, one or more memories), may communicate directly or indirectly with each other (e.g., via one or more buses).

[0159] Communication manager 720 can support wireless communication according to examples disclosed herein. Delay value component 725 is capable of, configured to, or operable to support components for obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel. Channel estimation component 730 is capable of, configured to, or operable to support components for performing channel estimation for a broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme. Message component 735 is capable of, configured to, or operable to support components for receiving messages via the broadcast channel based on the performed channel estimation.

[0160] In some examples, in order to support obtaining a first delay value, the candidate delay value component 740 is capable of, configured to, or able to operate to support a component for selecting a first delay value from a first set of candidate delay values ​​associated with the broadcast channel.

[0161] In some examples, the candidate delay value component 740 is capable of, configured to, or operable to support components for selecting a first set of candidate delay values ​​from a set of multiple candidate delay values ​​based on a frequency band associated with the broadcast channel. In some examples, the first delay value is based on a basic time unit associated with the broadcast channel.

[0162] In some examples, the delay value component 725 is capable of, configured to, or able to operate to support components for calculating a delay spread limit value based on a first delay value, wherein channel estimation is performed based on the delay spread limit value.

[0163] In some examples, the delay value component 725 is capable of, can be configured to, or is operable to support components for determining a delay spread distribution associated with a multipath distribution based on a first delay value, wherein channel estimation is performed based on the delay spread distribution.

[0164] In some examples, the delay value component 725 is capable of, configured to, or operable to support components for obtaining a second delay value associated with a low-delay CDD scheme for scheduling a control resource set via a broadcast channel. In some examples, the channel estimation component 730 is capable of, configured to, or operable to support components for performing channel estimation for the control resource set based on the second delay value. In some examples, the message component 735 is capable of, configured to, or operable to support components for receiving control messages via the control resource set based on the performed channel estimation for the control resource set.

[0165] In some examples, in order to support obtaining a second delay value, the delay value component 725 can be, configured, or operated to support components for selecting a second delay value based on a first delay value, such that the first delay value and the second delay value are the same.

[0166] In some examples, to support message reception via a broadcast channel, the delay value component 725 is capable of, configured to, or operable to support components for receiving messages indicating a second delay value, wherein the second delay value is determined based on the received message. In some examples, the control resource set includes a default control resource set. In some examples, control message scheduling system information block transmission is used.

[0167] In some examples, to support obtaining a first delay value, message component 735 is capable of, configured to, or operable to support components for a control message used to receive scheduling messages via a broadcast channel, wherein the control message indicates the first delay value. In some examples, the control message indicates a bit value. In some examples, the first delay value is selected based on a set of candidate delay values ​​associated with the broadcast channel.

[0168] In some examples, the candidate delay value component 740 is capable of, can be configured to, or is operable to support a component for selecting a set of candidate delay values ​​based on a frequency band associated with the broadcast channel.

[0169] Additionally or alternatively, the communication manager 720 may support wireless communication according to examples disclosed herein. The candidate delay value component 740 is capable of, configured to, or operable to support components for receiving a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for the channel. In some examples, the delay value component 725 is capable of, configured to, or operable to support components for receiving a second control message indicating a delay value from the set of multiple candidate delay values ​​applied to a scheduled message. In some examples, the channel estimation component 730 is capable of, configured to, or operable to support components for performing channel estimation for a channel based on one or more delay spread values ​​associated with the multipath distribution of the channel, wherein the one or more delay spread values ​​are based on delay values ​​applied to the scheduled message. In some examples, the message component 735 is capable of, configured to, or operable to support components for receiving a scheduled message based on the performed channel estimation. In some examples, the first control message includes an RRC message. In some examples, the second control message includes a MAC-CE message.

[0170] In some examples, the candidate delay value component 740 is capable of, configured to, or operable to support a component for receiving a third control message prior to receiving a set of active delay values ​​indicating a set of multiple candidate delay values, the active delay value set including delay values, wherein the active delay value set is mapped to code points in the downlink control information field of the second control message.

[0171] In some examples, in order to support the reception of a second control message, the delay value component 725 can be configured or operated to support components for receiving a second control message that includes a downlink control information field indicating a delay value selected from the set of active delay values.

[0172] In some examples, the second control message includes a downlink control message, and the third control message includes a MAC-CE message. In some examples, the first control message, the second control message, or both are sent as part of the TCI indication procedure.

[0173] Figure 8A diagram of a system 800 including a device 805 supporting low-delay CDD for data or control channels, according to one or more aspects of this disclosure, is shown. Device 805 may be an example of device 505, device 605, or UE 115 as described herein, or may include components thereof. Device 805 may communicate with one or more network entities 105, one or more UEs 115, or any combination thereof (e.g., wirelessly). Device 805 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 820, an input / output (I / O) controller 810, a transceiver 815, an antenna 825, at least one memory 830, code 835, and at least one processor 840. These components may communicate electronically or otherwise (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 845).

[0174] I / O controller 810 manages the input and output signals of device 805. I / O controller 810 can also manage peripheral devices not integrated into device 805. In some cases, I / O controller 810 may represent a physical connection or port to an external peripheral device. In some cases, I / O controller 810 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or another known operating system. Additionally or alternatively, I / O controller 810 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, I / O controller 810 may be implemented as part of one or more processors, such as at least one processor 840. In some cases, a user may interact with device 805 via I / O controller 810 or via hardware components controlled by I / O controller 810.

[0175] In some cases, device 805 may include a single antenna 825. However, in other cases, device 805 may have more than one antenna 825, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. Transceiver 815 may communicate bidirectionally via one or more antennas 825, a wired or wireless link as described herein. For example, transceiver 815 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 815 may also include a modem for: modulating packets; providing the modulated packets to one or more antennas 825 for transmission; and demodulating packets received from one or more antennas 825. Transceiver 815, or transceiver 815 and one or more antennas 825, may be an example of transmitter 515, transmitter 615, receiver 510, receiver 610, or any combination thereof or components thereof as described herein.

[0176] At least one memory 830 may include random access memory (RAM) and read-only memory (ROM). At least one memory 830 may store computer-readable, computer-executable code 835, including instructions that, when executed by at least one processor 840, cause device 805 to perform the various functions described herein. Code 835 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, code 835 may not be directly executable by at least one processor 840, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, among other things, at least one memory 830 may also include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0177] At least one processor 840 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, at least one processor 840 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into at least one processor 840. At least one processor 840 may be configured to execute computer-readable instructions stored in memory (e.g., at least one memory 830) to cause device 805 to perform various functions (e.g., functions or tasks supporting low-latency CDD for data or control channels). For example, device 805 or components of device 805 may include at least one processor 840 and at least one memory 830 coupled to or coupled to at least one processor 840, wherein at least one processor 840 and at least one memory 830 are configured to perform the various functions described herein. In some examples, at least one processor 840 may include multiple processors, and at least one memory 830 may include multiple memories. One or more of a plurality of processors may be coupled to one or more of a plurality of memories, which may be configured individually or collectively to perform the various functions described herein. In some examples, at least one processor 840 may be a component of a processing system, which may refer to a system of machines, circuits (including, for example, one or both of processor circuitry (which may include at least one processor 840) and memory circuitry (which may include at least one memory 830)) or components that receive or receive input and process such input to produce, generate, or obtain output. The processing system may be configured to perform one or more of the functions described herein. For example, at least one processor 840 or a processing system including at least one processor 840 may be configured, capable of being configured, or operable to cause device 805 to perform one or more of the functions described herein. Furthermore, as described herein, “configured to,” “capable of being configured,” and “operable to” are used interchangeably and may be associated with the ability to perform one or more of the functions described herein when executing code stored in at least one memory 830 or otherwise.

[0178] Communication manager 820 may support wireless communication according to examples disclosed herein. For example, communication manager 820 may be capable of, configured to, or operable to support components for obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel. Communication manager 820 may be capable of, configured to, or operable to support components for performing channel estimation for a broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme. Communication manager 820 may be capable of, configured to, or operable to support components for receiving messages via the broadcast channel based on performing channel estimation.

[0179] Additionally or alternatively, the communication manager 820 may support wireless communication according to examples disclosed herein. For example, the communication manager 820 may be capable of, configured to, or operable to support components for receiving a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for a channel. The communication manager 820 may be capable of, configured to, or operable to support components for receiving a second control message indicating a delay value from the set of multiple candidate delay values ​​applied to a scheduled message. The communication manager 820 may be capable of, configured to, or operable to support components for performing channel estimation for a channel based on one or more delay spread values ​​associated with the multipath distribution of the channel, wherein the one or more delay spread values ​​are based on the delay value applied to the scheduled message. The communication manager 820 may be capable of, configured to, or operable to support components for receiving a scheduled message based on performing channel estimation.

[0180] By including or configuring a communication manager 820 according to an example as described herein, device 805 can support techniques for low-latency CDD schemes for one or more channel types, which can increase channel diversity, thereby improving channel performance, reducing overhead (e.g., DMRS overhead) and latency, and improving communication stability between devices.

[0181] In some examples, the communication manager 820 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using a transceiver 815, one or more antennas 825, or any combination thereof, or otherwise cooperating with them. Although the communication manager 820 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 820 may be supported or performed by at least one processor 840, at least one memory 830, code 835, or any combination thereof. For example, code 835 may include instructions that can be executed by at least one processor 840 to cause device 805 to perform various aspects of low-delay CDD for data or control channels as described herein, or at least one processor 840 and at least one memory 830 may be otherwise configured to perform or support such operations individually or jointly.

[0182] Figure 9 A block diagram 900 illustrates a device 905 supporting low-latency CDD for data or control channels according to one or more aspects of this disclosure. Device 905 may be an example of aspects of network entity 105 as described herein. Device 905 may include a receiver 910, a transmitter 915, and a communication manager 920. Device 905, or one or more components of device 905 (e.g., receiver 910, transmitter 915, and communication manager 920), may include at least one processor that can be coupled to at least one memory to individually or jointly support or implement the described techniques. Each of these components may communicate with each other (e.g., via one or more buses).

[0183] Receiver 910 may provide components for acquiring (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). The information may be passed to other components of device 905. In some examples, receiver 910 may support acquiring information by receiving signals via one or more antennas. Additionally or alternatively, receiver 910 may support acquiring information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

[0184] Transmitter 915 may provide components for outputting (e.g., transmitting, providing, conveying, transmitting) information generated by other components of device 905. For example, transmitter 915 may output information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). In some examples, transmitter 915 may support outputting information by transmitting signals via one or more antennas. Additionally or alternatively, transmitter 915 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, transmitter 915 and receiver 910 may be co-located in a transceiver, which may include or be coupled to a modem.

[0185] The communication manager 920, receiver 910, transmitter 915, or various combinations thereof, or various components thereof, may be examples of components used to perform various aspects of low-delay CDD for data or control channels as described herein. For example, the communication manager 920, receiver 910, transmitter 915, or various combinations thereof, or components thereof, may be able to perform one or more of the functions described herein.

[0186] In some examples, the communication manager 920, receiver 910, transmitter 915, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include at least one of a processor, DSP, CPU, ASIC, FPGA, or other programmable logic device, microcontroller, discrete gate or transistor logic unit, discrete hardware component, or any combination thereof, configured as or otherwise individually or collectively to support components for performing the functions described herein. In some examples, at least one processor and at least one memory coupled to said at least one processor may be configured to perform one or more of the functions described herein (e.g., instructions stored in at least one memory are executed individually or collectively by one or more processors).

[0187] Additionally or alternatively, the communication manager 920, receiver 910, transmitter 915, or various combinations or components thereof may be implemented in code executed by at least one processor (e.g., as communication management software or firmware). If implemented in code executed by at least one processor, the functionality of the communication manager 920, receiver 910, transmitter 915, or various combinations or components thereof may be performed by any combination of a general-purpose processor, DSP, CPU, ASIC, FPGA, microcontroller, or these or other programmable logic devices (e.g., configured as or otherwise individually or jointly to support components for performing the functions described in this disclosure).

[0188] In some examples, the communication manager 920 may be configured to use a receiver 910, a transmitter 915, or both, or otherwise cooperate with them to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). For example, the communication manager 920 may receive information from the receiver 910, transmit information to the transmitter 915, or be integrated with the receiver 910, the transmitter 915, or both to acquire information, output information, or perform various other operations as described herein.

[0189] Communication manager 920 may support wireless communication according to examples disclosed herein. For example, communication manager 920 may be capable of, configured to, or operable to support components for obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel. Communication manager 920 may be capable of, configured to, or operable to support components for outputting an indication of the first delay value, wherein the first delay value is associated with a channel estimate for a broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, and wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme. Communication manager 920 may be capable of, configured to, or operable to support components for outputting a message via a broadcast channel based on an indication of the first delay value.

[0190] Additionally or alternatively, the communication manager 920 may support wireless communication according to the examples disclosed herein. For example, the communication manager 920 may be capable of, configured to, or operable to support a component for outputting a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for the channel. The communication manager 920 may be capable of, configured to, or operable to support a component for outputting a second control message indicating a delay value from the set of multiple candidate delay values ​​applied to a scheduled message. The communication manager 920 may be capable of, configured to, or operable to support a component for outputting a scheduled message based on the output of the second control message.

[0191] By including or configuring a communication manager 920 according to an example as described herein, device 905 (e.g., at least one processor that controls or otherwise couples to receiver 910, transmitter 915, communication manager 920, or a combination thereof) can support techniques for low-delay CDD schemes for channels, thereby improving channel performance, reducing overhead (e.g., DMRS overhead) and latency, and improving communication stability between devices.

[0192] Figure 10 A block diagram 1000 of a device 1005 supporting low-latency CDD for data or control channels according to one or more aspects of this disclosure is shown. Device 1005 may be an example of aspects of device 905 or network entity 105 as described herein. Device 1005 may include receiver 1010, transmitter 1015, and communication manager 1020. Device 1005 or one or more components of device 1005 (e.g., receiver 1010, transmitter 1015, and communication manager 1020) may include at least one processor that can be coupled to at least one memory to support the described techniques. Each of these components may communicate with each other (e.g., via one or more buses).

[0193] Receiver 1010 may provide components for acquiring (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). The information may be passed to other components of device 1005. In some examples, receiver 1010 may support acquiring information by receiving signals via one or more antennas. Additionally or alternatively, receiver 1010 may support acquiring information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.

[0194] Transmitter 1015 may provide components for outputting (e.g., transmitting, providing, conveying, transmitting) information generated by other components of device 1005. For example, transmitter 1015 may output information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). In some examples, transmitter 1015 may support outputting information by transmitting signals via one or more antennas. Additionally or alternatively, transmitter 1015 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, transmitter 1015 and receiver 1010 may be co-located in a transceiver, which may include or be coupled to a modem.

[0195] Device 1005 or its various components may be examples of parts used to perform various aspects of low-delay CDD for data or control channels as described herein. For example, communication manager 1020 may include delay value manager 1025, channel estimation manager 1030, message manager 1035, candidate delay value manager 1040, or any combination thereof. Communication manager 1020 may be examples of aspects of communication manager 920 as described herein. In some examples, communication manager 1020 or its various components may be configured to use receiver 1010, transmitter 1015, or both, or otherwise cooperate with them to perform various operations (e.g., receive, acquire, monitor, output, transmit). For example, communication manager 1020 may receive information from receiver 1010, transmit information to transmitter 1015, or be integrated in combination with receiver 1010, transmitter 1015, or both to acquire information, output information, or perform various other operations as described herein.

[0196] Communication manager 1020 can support wireless communication according to examples disclosed herein. Delay value manager 1025 is capable of, configured to, or operable to support components for obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel. Channel estimation manager 1030 is capable of, configured to, or operable to support components for outputting an indication of the first delay value, wherein the first delay value is associated with a channel estimation for a broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, and wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme. Message manager 1035 is capable of, configured to, or operable to support components for outputting a message via the broadcast channel based on an indication of the first delay value.

[0197] Additionally or alternatively, the communication manager 1020 may support wireless communication according to the examples disclosed herein. The delay value manager 1025 is capable of, configured to, or operable to support components for outputting a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for the channel. The candidate delay value manager 1040 is capable of, configured to, or operable to support components for outputting a second control message indicating a delay value from the set of multiple candidate delay values ​​applied to the scheduled message. The message manager 1035 is capable of, configured to, or operable to support components for outputting the scheduled message based on the output of the second control message.

[0198] Figure 11 A block diagram 1100 is shown of a communication manager 1120 supporting small-latency CDD for data or control channels according to one or more aspects of this disclosure. Communication manager 1120 may be an example of aspects of communication manager 920, communication manager 1020, or both as described herein. Communication manager 1120 or its various components may be examples of components for performing various aspects of small-latency CDD for data or control channels as described herein. For example, communication manager 1120 may include a delay value manager 1125, a channel estimation manager 1130, a message manager 1135, a candidate delay value manager 1140, or any combination thereof. These components, or each of their components or sub-components (e.g., one or more processors, one or more memories), may communicate directly or indirectly with each other (e.g., via one or more buses), and this communication may include communication within protocol layers of a protocol stack, communication associated with logical channels of the protocol stack (e.g., between protocol layers of the protocol stack, within devices, components, or virtualization components associated with network entity 105, between devices, components, or virtualization components associated with network entity 105), or any combination thereof.

[0199] Communication manager 1120 can support wireless communication according to examples disclosed herein. Delay value manager 1125 is capable of, configured to, or operable to support components for obtaining a first delay value associated with a small-delay CDD scheme for a broadcast channel. Channel estimation manager 1130 is capable of, configured to, or operable to support components for outputting an indication of the first delay value, wherein the first delay value is associated with a channel estimation for a broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, and wherein the one or more delay spread values ​​are based on the first delay value associated with the small-delay CDD scheme. Message manager 1135 is capable of, configured to, or operable to support components for outputting a message via the broadcast channel based on an indication of the first delay value.

[0200] In some examples, in order to support obtaining a first delay value, the candidate delay value manager 1140 is capable of, configured to, or able to operate to support components for selecting a first delay value from a first set of candidate delay values ​​associated with the broadcast channel.

[0201] In some examples, the candidate delay value manager 1140 is capable of, configured to, or operable to support components for selecting a first set of candidate delay values ​​from a set of multiple candidate delay values ​​based on a frequency band associated with the broadcast channel. In some examples, the first delay value is determined based on a basic time unit associated with the broadcast channel.

[0202] In some examples, the delay value manager 1125 is capable of, configured to, or operable to support components for obtaining a second delay value associated with a low-delay CDD scheme for scheduling a control resource set via a broadcast channel. In some examples, the channel estimation manager 1130 is capable of, configured to, or operable to support components for outputting an indication of a second delay value, wherein the second delay value is associated with a channel estimate for the control resource set. In some examples, the message manager 1135 is capable of, configured to, or operable to support components for obtaining control messages via the control resource set based on the output indication of the second delay value.

[0203] In some examples, in order to support obtaining a second delay value, the delay value manager 1125 can be, configured, or operated to support components for selecting a second delay value based on a first delay value, such that the first delay value and the second delay value are the same.

[0204] In some examples, to support message output via a broadcast channel, message manager 1135 is capable of, configured to, or operable to support components for outputting messages indicating a second delay value, wherein outputting an indication of the second delay value includes outputting messages via a broadcast channel. In some examples, the control resource set includes a default control resource set. In some examples, control message scheduling system information block transmission.

[0205] In some examples, in order to support the output indicating a first delay value, message manager 1135 is capable of, configured to, or able to operate to support components for outputting control messages for scheduling messages via a broadcast channel, wherein the control messages indicate the first delay value.

[0206] In some examples, the control message indicates the bit value. In other examples, the first delay value is selected from a set of candidate delay values ​​associated with the broadcast channel based on the bit value.

[0207] In some examples, the candidate delay value manager 1140 is capable of, configured to, or able to operate to support components for selecting a set of candidate delay values ​​based on the frequency band associated with the broadcast channel.

[0208] Additionally or alternatively, the communication manager 1120 may support wireless communication according to examples disclosed herein. In some examples, the delay value manager 1125 is capable of, configured to, or operable to support components for outputting a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for the channel. The candidate delay value manager 1140 is capable of, configured to, or operable to support components for outputting a second control message indicating a delay value from the set of multiple candidate delay values ​​applied to the scheduled message. In some examples, the message manager 1135 is capable of, configured to, or operable to support components for outputting the scheduled message based on the output of the second control message. In some examples, the first control message includes an RRC message. In some examples, the second control message is or includes a MAC-CE message.

[0209] In some examples, the candidate delay value manager 1140 is capable of, configured to, or operable to support components for outputting a third control message prior to the output of a second control message that indicates an active set of delay values ​​from a set of multiple candidate delay values, the active set of delay values ​​including delay values, wherein the active set of delay values ​​is mapped to code points in the downlink control information field of the second control message.

[0210] In some examples, in order to support the output of a second control message, the delay value manager 1125 is capable of, can be configured to, or is operable to support components for outputting a second control message that includes a downlink control information field indicating a delay value selected from the set of active delay values.

[0211] In some examples, the second control message includes a downlink control message, and the third control message is or includes a MAC-CE message. In some examples, the first control message, the second control message, or both are output as part of the TCI indication procedure.

[0212] Figure 12A diagram of a system 1200 including a device 1205 supporting low-delay CDD for data or control channels, according to one or more aspects of this disclosure, is shown. Device 1205 may be an example of device 905, device 1005, or network entity 105 as described herein, or may include components thereof. Device 1205 may communicate with one or more network entities 105, one or more UEs 115, or any combination thereof, and this communication may include communication via one or more wired interfaces, one or more wireless interfaces, or any combination thereof. Device 1205 may include components supporting output and obtaining communication, such as a communication manager 1220, a transceiver 1210, an antenna 1215, at least one memory 1225, code 1230, and at least one processor 1235. These components may communicate electronically or otherwise (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 1240).

[0213] Transceiver 1210 may support bidirectional communication via a wired link, a wireless link, or both, as described herein. In some examples, transceiver 1210 may include a wired transceiver and be capable of bidirectional communication with another wired transceiver. Additionally or alternatively, in some examples, transceiver 1210 may include a wireless transceiver and be capable of bidirectional communication with another wireless transceiver. In some examples, device 1205 may include one or more antennas 1215 that are capable of (e.g., concurrently) transmitting or receiving wireless transmissions. Transceiver 1210 may also include a modem for: modulating a signal; providing the modulated signal for transmission (e.g., by one or more antennas 1215, by a wired transmitter); receiving the modulated signal (e.g., from one or more antennas 1215, from a wired receiver); and demodulating the signal. In some embodiments, transceiver 1210 may include one or more interfaces, such as one or more interfaces coupled to one or more antennas 1215 configured to support various receive or acquire operations, or one or more interfaces coupled to one or more antennas 1215 configured to support various transmit or output operations, or combinations thereof. In some embodiments, transceiver 1210 may include one or more processors or one or more memory components, or be configured to couple to said one or more processors or one or more memory components, which are operable to perform or support operations based on received or acquired information or signals, or generate information or other signals for transmission or other output, or any combination thereof. In some embodiments, transceiver 1210, or transceiver 1210 and one or more antennas 1215, or transceiver 1210 and one or more antennas 1215, and one or more processors or one or more memory components (e.g., at least one processor 1235, at least one memory 1225, or both) may be included in a chip or chip assembly mounted in device 1205. In some examples, transceiver 1210 may be operable to support communication via one or more communication links (e.g., communication link 125, backhaul communication link 120, midhaul communication link 162, fronthaul communication link 168).

[0214] At least one memory 1225 may include RAM, ROM, or any combination thereof. At least one memory 1225 may store computer-readable, computer-executable code 1230 including instructions that, when executed by one or more processors of at least one processor 1235, cause device 1205 to perform the various functions described herein. Code 1230 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, code 1230 may not be directly executable by a processor of at least one processor 1235, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, at least one memory 1225 may also include a BIOS, among other things, that controls basic hardware or software operations, such as interaction with peripheral components or devices. In some examples, at least one processor 1235 may include multiple processors, and at least one memory 1225 may include multiple memories. One or more of the multiple processors may be coupled to one or more of the multiple memories, which may be configured individually or collectively to perform the various functions described herein (e.g., as part of a processing system).

[0215] At least one processor 1235 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, ASICs, CPUs, FPGAs, microcontrollers, programmable logic devices, discrete gate or transistor logic units, discrete hardware components, or any combination thereof). In some cases, at least one processor 1235 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into one or more processors in at least one processor 1235. At least one processor 1235 may be configured to execute computer-readable instructions stored in memory (e.g., one or more memories in at least one memory 1225) to cause device 1205 to perform various functions (e.g., functions or tasks supporting low-latency CDD for data or control channels). For example, device 1205 or components of device 1205 may include at least one processor 1235 and at least one memory 1225 coupled to one or more processors in at least one processor 1235, wherein at least one processor 1235 and at least one memory 1225 are configured to perform the various functions described herein. At least one processor 1235 may be an example of a cloud computing platform (e.g., one or more physical nodes and supporting software such as an operating system, virtual machine, or container instance) that can (e.g., by executing code 1230) host functions for performing the functions of device 1205. At least one processor 1235 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in device 1205 (such as within one or more memories in at least one memory 1225). In some examples, at least one processor 1235 may include multiple processors, and at least one memory 1225 may include multiple memories. One or more of the multiple processors may be coupled to one or more of the multiple memories, which may be configured individually or collectively to perform the various functions described herein. In some examples, at least one processor 1235 may be a component of a processing system, which may refer to a system of machines, circuits (including, for example, one or both of processor circuitry (which may include at least one processor 1235) and memory circuitry (which may include at least one memory 1225) that receive or acquire input and process such input to produce, generate, or acquire output. The processing system may be configured to perform one or more of the functions described herein. For example, at least one processor 1235 or a processing system including at least one processor 1235 may be configured, configured to, or operable to cause the device 1205 to perform one or more of the functions described herein.Furthermore, as described herein, “configured to,” “capable of being configured to,” and “capable of operating to” are used interchangeably and may be associated with the ability to perform one or more of the functions described herein when executing code stored in at least one memory 1225 or otherwise.

[0216] In some examples, bus 1240 may support communication at the protocol layer of the protocol stack (e.g., within a protocol layer). In some examples, bus 1240 may support communication associated with logical channels of the protocol stack (e.g., between protocol layers of the protocol stack), which may include communication performed within components of device 1205, or communication performed between different components of device 1205 that are co-addressable or may be located in different locations (e.g., where device 1205 may refer to a system in which one or more of communication manager 1220, transceiver 1210, at least one memory 1225, code 1230 and at least one processor 1235 may be located in one component of different components or partitioned between different components).

[0217] In some examples, the communication manager 1220 may manage (e.g., via one or more wired or wireless backhaul links) various aspects of communication with the core network 130. For example, the communication manager 1220 may manage the delivery of data communications by client devices, such as one or more UEs 115. In some examples, the communication manager 1220 may manage communication with other network entities 105 and may include a controller or scheduler for cooperating with other network entities 105 to control communication with UE 115. In some examples, the communication manager 1220 may support an X2 interface within LTE / LTE-A wireless communication network technology to provide communication between network entities 105.

[0218] Communication manager 1220 may support wireless communication according to examples disclosed herein. For example, communication manager 1220 may be capable of, configured to, or operable to support components for obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel. Communication manager 1220 may be capable of, configured to, or operable to support components for outputting an indication of the first delay value, wherein the first delay value is associated with a channel estimate for a broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, and wherein the one or more delay spread values ​​are based on the first delay value associated with the low-delay CDD scheme. Communication manager 1220 may be capable of, configured to, or operable to support components for outputting a message via a broadcast channel based on an indication of the first delay value.

[0219] Additionally or alternatively, the communication manager 1220 may support wireless communication according to the examples disclosed herein. For example, the communication manager 1220 may be capable of, configured to, or operable to support components for outputting a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for the channel. The communication manager 1220 may be capable of, configured to, or operable to support components for outputting a second control message indicating a delay value from the set of multiple candidate delay values ​​applied to a scheduled message. The communication manager 1220 may be capable of, configured to, or operable to support components for outputting a scheduled message based on the output of the second control message.

[0220] By including or configuring a communication manager 1220 according to an example as described herein, device 1205 can support techniques for low-delay CDD schemes for channels, thereby improving channel performance, reducing overhead (e.g., DMRS overhead) and latency, and improving communication stability between devices.

[0221] In some examples, the communication manager 1220 may be configured to use or otherwise coordinate with the transceiver 1210, one or more antennas 1215 (e.g., where applicable), or any combination thereof to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting). Although the communication manager 1220 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1220 may be supported or performed by the transceiver 1210, one or more processors in at least one processor 1235, one or more memories in at least one memory 1225, code 1230, or any combination thereof (e.g., by a processing system including at least a portion of at least one processor 1235, at least one memory 1225, code 1230, or any combination thereof). For example, code 1230 may include instructions that can be executed by one or more processors in at least one processor 1235 to cause the device 1205 to perform various aspects of low-delay CDD for data or control channels as described herein, or at least one processor 1235 and at least one memory 1225 may be otherwise configured to perform or support such operations individually or jointly.

[0222] Figure 13 A flowchart illustrating a method 1300 for supporting low-delay CDD for data or control channels, according to an example disclosed herein, is shown. Operation of method 1300 can be implemented by a UE or its components as described herein. For example, operation of method 1300 can be achieved by, as referenced herein... Figures 1 to 8The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0223] At 1305, the method may include obtaining a first delay value associated with a small-delay CDD scheme for the broadcast channel. The operation of block 1305 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1305 may be derived from references... Figure 7 The described delay value component 725 is used for execution.

[0224] At 1310, the method may include performing channel estimation for the broadcast channel based on one or more delay spread values ​​associated with the multipath distribution of the broadcast channel, wherein the one or more delay spread values ​​are based on a first delay value associated with a small-delay CDD scheme. The operation of block 1310 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1310 may be derived from references... Figure 7 The described channel estimation component 730 is used to perform this.

[0225] At 1315, the method may include receiving a message via a broadcast channel based on performing channel estimation. The operation of block 1315 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1315 may be derived from references... Figure 7 The message component 735 described is used for execution.

[0226] Figure 14 A flowchart illustrating a method 1400 for supporting low-delay CDD for data or control channels, according to an example disclosed herein, is shown. Operation of method 1400 can be implemented by a UE or its components as described herein. For example, operation of method 1400 can be achieved by, as referenced... Figures 1 to 8 The UE 115 described herein is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described function.

[0227] At 1405, the method may include receiving a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for the channel. Operation of block 1405 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1405 may be provided by reference to [reference needed]. Figure 7 The candidate delay value component 740 is described for execution.

[0228] At 1410, the method may include receiving a second control message indicating a delay value from a set of multiple candidate delay values ​​applicable to the scheduled message. The operation of block 1410 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1410 may be provided by reference to [reference needed]. Figure 7 The described delay value component 725 is used for execution.

[0229] At 1415, the method may include performing channel estimation for the channel based on one or more delay spread values ​​associated with the multipath distribution of the channel, wherein the one or more delay spread values ​​are based on delay values ​​applied to the scheduled message. The operation of block 1415 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1415 may be derived from references... Figure 7 The described channel estimation component 730 is used to perform this.

[0230] At 1420, the method may include receiving a scheduled message based on performing a channel estimation. The operation of block 1420 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1420 may be derived from references... Figure 7 The message component 735 described is used for execution.

[0231] Figure 15 A flowchart illustrating a method 1500 for supporting low-delay CDD for data or control channels, according to examples disclosed herein, is shown. Operation of method 1500 may be implemented by a network entity or its components as described herein. For example, operation of method 1500 may be performed by, as referenced... Figures 1 to 4 as well as Figures 9 to 12 The network entity described is used to perform this function. In some examples, the network entity may execute a set of instructions to control the functional elements of the network entity to perform the described function. Additionally or alternatively, the network entity may use dedicated hardware to perform aspects of the described function.

[0232] At 1505, the method may include obtaining a first delay value associated with a small-delay CDD scheme for the broadcast channel. The operation of block 1505 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1505 may be derived from references... Figure 11 The described delay value manager 1125 is used to execute this.

[0233] At 1510, the method may include outputting an indication of a first delay value, wherein the first delay value is associated with a channel estimate for the broadcast channel based on one or more delay spread values ​​associated with the multipath distribution of the broadcast channel, and wherein the one or more delay spread values ​​are based on the first delay value associated with a small-delay CDD scheme. Operation of block 1510 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1510 may be derived from references... Figure 11 The described channel estimation manager 1130 performs this function.

[0234] At 1515, the method may include outputting a message via a broadcast channel based on an indication of a first delay value. The operation of block 1515 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1515 may be provided by reference to [reference needed]. Figure 11 The message manager 1135 described is used for execution.

[0235] Figure 16 A flowchart illustrating a method 1600 for supporting low-delay CDD for data or control channels, according to examples disclosed herein, is shown. Operation of method 1600 may be implemented by a network entity or its components as described herein. For example, operation of method 1600 may be implemented by, as referenced... Figures 1 to 4 as well as Figures 9 to 12 The network entity described is used to perform this function. In some examples, the network entity may execute a set of instructions to control the functional elements of the network entity to perform the described function. Additionally or alternatively, the network entity may use dedicated hardware to perform aspects of the described function.

[0236] At 1605, the method may include outputting a first control message indicating a set of multiple candidate delay values ​​associated with a small-delay CDD scheme for the channel. Operation of block 1605 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1605 may be provided by reference to [reference needed]. Figure 11 The described delay value manager 1125 is used to execute this.

[0237] At 1610, the method may include outputting a second control message indicating a delay value from a set of multiple candidate delay values ​​applicable to the scheduled message. The operation of block 1610 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1610 may be provided by reference to [reference needed]. Figure 11 The candidate delay value manager 1140 is described and executed.

[0238] At 1615, the method may include outputting a scheduled message based on an output second control message. The operation of block 1615 may be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1615 may be derived from references... Figure 11 The message manager 1135 described is used for execution.

[0239] The following provides an overview of the various aspects of this disclosure:

[0240] Aspect 1: A method for wireless communication by a UE, the method comprising: obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel; performing a channel estimation for the broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, wherein the one or more delay spread values ​​are based at least in part on the first delay value associated with the low-delay CDD scheme; and receiving a message via the broadcast channel based at least in part on performing the channel estimation.

[0241] Aspect 2: According to the method of aspect 1, obtaining the first delay value further includes: selecting the first delay value from a first set of candidate delay values ​​associated with the broadcast channel.

[0242] Aspect 3: According to the method of aspect 2, the method further includes: selecting the first set of candidate delay values ​​from a plurality of candidate delay values ​​based at least in part on a frequency band associated with the broadcast channel.

[0243] Aspect 4: The method according to any one of Aspects 1 to 3, wherein the first delay value is based on a basic time unit associated with the broadcast channel.

[0244] Aspect 5: The method according to any one of Aspects 1 to 4, the method further comprising: calculating a delay spread limit value based at least in part on the first delay value, wherein the channel estimation is performed based on the delay spread limit value.

[0245] Aspect 6: The method according to any one of Aspects 1 to 5, the method further comprising: determining a delay spread distribution associated with the multipath distribution based at least in part on the first delay value, wherein the channel estimation is performed based on the delay spread distribution.

[0246] Aspect 7: The method according to any one of Aspects 1 to 6, the method further comprising: obtaining a second delay value associated with the low-delay CDD scheme for scheduling a set of control resources via the broadcast channel; performing channel estimation for the set of control resources based on the second delay value; and receiving control messages via the set of control resources based at least in part on performing the channel estimation for the set of control resources.

[0247] Aspect 8: According to the method of aspect 7, obtaining the second delay value further includes: selecting the second delay value based at least in part on the first delay value, such that the first delay value and the second delay value are the same.

[0248] Aspect 9: The method according to any one of Aspects 7 to 8, wherein receiving the message via the broadcast channel further comprises: receiving the message indicating the second delay value, wherein determining the second delay value is at least in part based on receiving the message.

[0249] Aspect 10: The method according to any one of Aspects 7 to 9, wherein the control resource set includes a default control resource set, and the control message scheduling system information block is sent.

[0250] Aspect 11: The method according to any one of Aspects 1 to 10, wherein obtaining the first delay value further includes: receiving a control message for scheduling the message via the broadcast channel, wherein the control message indicates the first delay value.

[0251] Aspect 12: According to the method of aspect 11, wherein the control message indicates a bit value, and the first delay value is selected from a set of candidate delay values ​​associated with the broadcast channel based at least in part on the bit value.

[0252] Aspect 13: The method according to aspect 12, the method further comprising: selecting the set of candidate delay values ​​at least in part based on a frequency band associated with the broadcast channel.

[0253] Aspect 14: A method for wireless communication by a UE, the method comprising: receiving a first control message indicating a plurality of candidate delay values ​​associated with a small delay CDD scheme for a channel; receiving a second control message indicating a delay value among the plurality of candidate delay values ​​applied to the scheduled message for a scheduled message; performing channel estimation for the channel based on one or more delay spread values ​​associated with a multipath distribution of the channel, wherein the one or more delay spread values ​​are based at least in part on the delay value applied to the scheduled message; and receiving the scheduled message at least in part based on performing the channel estimation.

[0254] Aspect 15: The method according to aspect 14, wherein the first control message includes an RRC message.

[0255] Aspect 16: The method according to any one of Aspects 14 to 15, wherein the second control message includes a MAC-CE message.

[0256] Aspect 17: The method according to any one of Aspects 14 to 16, the method further comprising: receiving, before receiving the second control message, a third control message indicating an active delay value set from the plurality of candidate delay values, the active delay value set including the delay values, wherein the active delay value set is mapped to code points in a downlink control information field of the second control message.

[0257] Aspect 18: According to the method of aspect 17, receiving the second control message further includes: receiving the second control message including the downlink control information field, the downlink control information field indicating the delay value selected from the set of active delay values.

[0258] Aspect 19: According to the method of aspect 18, wherein the second control message includes a downlink control message and the third control message includes a MAC-CE message.

[0259] Aspect 20: The method according to any one of Aspects 14 to 19, wherein the first control message, the second control message, or both are sent as part of the TCI indication process.

[0260] Aspect 21: A method for wireless communication by a network entity, the method comprising: obtaining a first delay value associated with a low-delay CDD scheme for a broadcast channel; outputting an indication of the first delay value, wherein the first delay value is associated with a channel estimate for the broadcast channel based on one or more delay spread values ​​associated with a multipath distribution of the broadcast channel, and wherein the one or more delay spread values ​​are based at least in part on the first delay value associated with the low-delay CDD scheme; and outputting a message via the broadcast channel based at least in part on the indication of the first delay value.

[0261] Aspect 22: According to the method of aspect 21, obtaining the first delay value further includes: selecting the first delay value from a first set of candidate delay values ​​associated with the broadcast channel.

[0262] Aspect 23: The method according to aspect 22 further includes: selecting the first set of candidate delay values ​​from a plurality of candidate delay values ​​based at least in part on a frequency band associated with the broadcast channel.

[0263] Aspect 24: The method according to any one of Aspects 21 to 23, wherein the first delay value is determined at least in part based on a basic time unit associated with the broadcast channel.

[0264] Aspect 25: The method according to any one of Aspects 21 to 24, the method further comprising: obtaining a second delay value associated with the low-delay CDD scheme for scheduling a set of control resources via the broadcast channel; outputting an indication of the second delay value, wherein the second delay value is associated with a channel estimate for the set of control resources; and obtaining a control message via the set of control resources based at least in part on the output of the indication of the second delay value.

[0265] Aspect 26: According to the method of aspect 25, obtaining the second delay value further includes: selecting the second delay value based at least in part on the first delay value, such that the first delay value and the second delay value are the same.

[0266] Aspect 27: The method according to any one of Aspects 25 to 26, wherein outputting the message via the broadcast channel further comprises: outputting the message indicating the second delay value, wherein outputting the indication of the second delay value includes outputting the message via the broadcast channel.

[0267] Aspect 28: The method according to any one of Aspects 25 to 27, wherein the control resource set includes a default control resource set, and the control message scheduling system information block is sent.

[0268] Aspect 29: The method according to any one of aspects 21 to 28, wherein outputting the indication of the first delay value further comprises: outputting a control message for scheduling the message via the broadcast channel, wherein the control message indicates the first delay value.

[0269] Aspect 30: The method according to aspect 29, wherein the control message indicates a bit value, and the first delay value is selected from a set of candidate delay values ​​associated with the broadcast channel based at least in part on the bit value.

[0270] Aspect 31: The method according to aspect 30, the method further comprising: selecting the set of candidate delay values ​​at least in part based on a frequency band associated with the broadcast channel.

[0271] Aspect 32: A method for wireless communication by a network entity, the method comprising: outputting a first control message indicating a plurality of candidate delay values ​​associated with a small delay CDD scheme for a channel; outputting a second control message indicating a delay value among the plurality of candidate delay values ​​applied to the scheduled message for a scheduled message; and outputting the scheduled message based at least in part on the output of the second control message.

[0272] Aspect 33: According to the method of aspect 32, the first control message includes an RRC message.

[0273] Aspect 34: The method according to any one of Aspects 32 to 33, wherein the second control message includes a MAC-CE message.

[0274] Aspect 35: The method according to any one of aspects 32 to 34, the method further comprising: outputting a third control message indicating an active delay value set from the plurality of candidate delay values, the active delay value set including the delay values, before outputting the second control message, wherein the active delay value set is mapped to code points of a downlink control information field of the second control message.

[0275] Aspect 36: According to the method of aspect 35, the output of the second control message further includes: outputting the second control message including the downlink control information field, the downlink control information field indicating the delay value selected from the set of active delay values.

[0276] Aspect 37: According to the method of aspect 36, wherein the second control message includes a downlink control message and the third control message includes a MAC-CE message.

[0277] Aspect 38: The method according to any one of Aspects 32 to 37, wherein the first control message, the second control message, or both are output as part of the TCI indication process.

[0278] Aspect 39: A UE for wireless communication, the UE comprising: one or more memories storing processor-executable code; and one or more processors coupled to the one or more memories and capable of operating individually or jointly to execute the code to cause the UE to perform a method according to any one of aspects 1 to 13.

[0279] Aspect 40: A UE for wireless communication, the UE including at least one component for performing the method according to any one of aspects 1 to 13.

[0280] Aspect 41: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by one or more processors to perform the method according to any one of aspects 1 to 13.

[0281] Aspect 42: A UE for wireless communication, the UE comprising: one or more memories storing processor-executable code; and one or more processors coupled to the one or more memories and capable of operating individually or jointly to execute the code to cause the UE to perform a method according to any one of aspects 14 to 20.

[0282] Aspect 43: A UE for wireless communication, the UE comprising at least one component for performing a method according to any one of aspects 14 to 20.

[0283] Aspect 44: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by one or more processors to perform a method according to any one of aspects 14 to 20.

[0284] Aspect 45: A network entity for wireless communication, the network entity comprising: one or more memories storing processor-executable code; and one or more processors coupled to the one or more memories and capable of operating individually or jointly to execute the code to cause the network entity to perform a method according to any one of Aspects 21 to 31.

[0285] Aspect 46: A network entity for wireless communication, the network entity comprising at least one component for performing the method according to any one of aspects 21 to 31.

[0286] Aspect 47: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by one or more processors to perform a method according to any one of aspects 21 to 31.

[0287] Aspect 48: A network entity for wireless communication, the network entity comprising: one or more memories storing processor-executable code; and one or more processors coupled to the one or more memories and capable of operating individually or jointly to execute the code to cause the network entity to perform a method according to any one of Aspects 32 to 38.

[0288] Aspect 49: A network entity for wireless communication, the network entity comprising at least one component for performing the method according to any one of aspects 32 to 38.

[0289] Aspect 50: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by one or more processors to perform a method according to any one of aspects 32 to 38.

[0290] It should be noted that the methods described herein describe possible specific implementations, and the operations and steps can be rearranged or otherwise modified, and other specific implementations are also possible. Furthermore, aspects from two or more of these methods can be combined.

[0291] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein are also applicable to networks outside of LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described are applicable to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0292] The information and signals described herein can be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or optical particles, or any combination thereof.

[0293] The various exemplary blocks and components described herein can be implemented or performed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic unit, discrete hardware component, or any combination thereof, designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in alternative embodiments, a 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 cooperating with a DSP core, or any other such configuration). Any function or operation described herein that can be performed by a processor may be performed by multiple processors capable of performing the described functions or operations individually or jointly.

[0294] The functions described herein can be implemented using hardware, software executed by a processor, firmware, or any combination thereof. When implemented using software executed by a processor, the functions can be stored as one or more instructions or code on a computer-readable medium or transmitted using one or more instructions or code on a computer-readable medium. Other examples and specific implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. Features implementing the functions can also be physically located in various locations, including various portions distributed such that the functions are implemented in different physical locations.

[0295] Computer-readable media includes both non-transitory computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. Non-transitory storage media can be any available medium accessible 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, compressed optical disc (CD) ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code components in the form of instructions or data structures, and accessible by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Furthermore, any connection is appropriately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included within the definition of computer-readable media. As used herein, disks and optical discs include CDs, laser discs, optical discs, digital multifunction discs (DVDs), floppy disks, and Blu-ray discs. Disks can magnetically reproduce data, and optical discs can optically reproduce data using lasers. Combinations of the above are also included within the scope of computer-readable media. Any function or operation described herein that can be performed by memory can be performed by multiple memories capable of performing the described function or operation individually or jointly.

[0296] As used herein, the word "or" in a list of items (e.g., a list of items accompanied by phrases such as "at least one of" or "one or more of") in the claims indicates an inclusive list, such that a list of at least one of, for example, 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). Furthermore, as used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an example step described as "based on condition A" could be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0297] As used herein, including in claims, the article “a” preceding a noun is open-ended and is understood to refer to “at least one” or “one or more” of those nouns. Therefore, the terms “a,” “at least one,” “one or more,” and “at least one of one or more” are interchangeable. For example, where a claim enumerates “components” performing 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 “component” having a characteristic or performing a function may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent references to a component introduced with the article “a” using the terms “the” or “the” can refer to any or all of the one or more components. For example, a component introduced with the article “a” can be understood to mean “one or more components,” and subsequent reference to “the component” in a claim can be understood as equivalent to referring to “at least one of the one or more components.” Similarly, subsequent references to a component introduced with the terms “the” or “the” as “one or more components” can refer to any or all of the one or more components. For example, reference to "the one or more components" in the subsequent claims can be understood as equivalent to reference to "at least one of the one or more components".

[0298] The term "determine" encompasses a variety of actions, and therefore, "determine" can include calculation, computation, processing, derivation, investigation, lookup (such as by searching in a table, database, or other data structure), identification, and similar actions. Furthermore, "determine" can include receiving (e.g., receiving information), accessing (e.g., accessing data stored in memory), etc. Moreover, "determine" can include parsing, obtaining, selecting, choosing, building, and other similar actions.

[0299] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, various components of the same type can be distinguished by adding a dash after the reference numeral and a second reference numeral to differentiate them. If only the first reference numeral is used in the description, the description can be applied to any of the similar components having the same first reference numeral, regardless of the second or other subsequent reference numerals.

[0300] The description herein, illustrated with reference to the accompanying drawings, describes an example configuration and does not represent all implementable or within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," and not "preferred" or "advantageous over other examples." The detailed description includes specific details used to provide an understanding of the described techniques. However, these techniques can be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concept of the described examples.

[0301] The description herein is provided to enable those skilled in the art to implement or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A user equipment (UE), the user equipment (UE) comprising: One or more memories, wherein the one or more memories store processor-executable code; and One or more processors, coupled to one or more memories and capable of operating individually or jointly to execute the code to enable the UE: Obtain the first delay value associated with the small delay cyclic delay diversity (CDD) scheme used for the broadcast channel; Channel estimation for the broadcast channel is performed based on one or more delay spread values ​​associated with the multipath distribution of the broadcast channel, wherein the one or more delay spread values ​​are at least partially based on the first delay value associated with the low-delay CDD scheme; as well as Messages are received via the broadcast channel based at least in part on performing the channel estimation.

2. The UE according to claim 1, wherein, In order to obtain the first delay value, the one or more processors can individually or jointly further operate to execute the code to enable the UE: The first delay value is selected from a first set of candidate delay values ​​associated with the broadcast channel.

3. The UE of claim 2, wherein the one or more processors are individually or jointly capable of further operating to execute the code to cause the UE to: The first set of candidate delay values ​​is selected from a plurality of candidate delay values, at least in part based on the frequency band associated with the broadcast channel.

4. The UE of claim 1, wherein the first delay value is based on a basic time unit associated with the broadcast channel.

5. The UE of claim 1, wherein the one or more processors are individually or jointly capable of further operating to execute the code to cause the UE to: The delay spread limit value is calculated at least in part based on the first delay value, wherein the channel estimation is performed based on the delay spread limit value.

6. The UE of claim 1, wherein the one or more processors are individually or jointly capable of further operating to execute the code to cause the UE to: The delay spread distribution associated with the multipath distribution is determined at least in part based on the first delay value, wherein the channel estimation is performed based on the delay spread distribution.

7. The UE of claim 1, wherein the one or more processors are individually or jointly capable of further operating to execute the code to cause the UE to: Obtain a second delay value associated with the low-delay CDD scheme used for scheduling the set of control resources via the broadcast channel; Channel estimation for the control resource set is performed based on the second delay value; as well as Control messages are received via the control resource set, at least in part, based on performing the channel estimation for the control resource set.

8. The UE according to claim 7, wherein, In order to obtain the second delay value, the one or more processors can individually or jointly further operate to execute the code to enable the UE: The second delay value is selected at least in part based on the first delay value, such that the first delay value and the second delay value are the same.

9. The UE according to claim 7, wherein, In order to receive the message via the broadcast channel, the one or more processors may individually or jointly further operate to execute the code to enable the UE to: Receive the message indicating the second delay value, wherein the second delay value is determined at least in part based on receiving the message.

10. The UE according to claim 7, wherein the control resource set includes a default control resource set, and wherein the control message scheduling system information block is sent.

11. The UE according to claim 1, wherein, In order to obtain the first delay value, the one or more processors can individually or jointly further operate to execute the code to enable the UE: A control message for scheduling the message is received via the broadcast channel, wherein the control message indicates the first delay value.

12. The UE of claim 11, wherein the control message indicates a bit value, and wherein the first delay value is selected from a set of candidate delay values ​​associated with the broadcast channel based at least in part on the bit value.

13. The UE of claim 12, wherein the one or more processors are individually or jointly further operable to execute the code to cause the UE to: The set of candidate delay values ​​is selected at least in part based on the frequency band associated with the broadcast channel.

14. A user equipment (UE), the user equipment (UE) comprising: One or more memories, wherein the one or more memories store processor-executable code; and One or more processors, coupled to one or more memories and capable of operating individually or jointly to execute the code to enable the UE: Receive a first control message indicating multiple candidate delay values ​​associated with a small delay cyclic delay diversity (CDD) scheme for the channel; Receive a second control message indicating, for the scheduled message, a delay value among the plurality of candidate delay values ​​to be applied to the scheduled message; Channel estimation for the channel is performed based on one or more delay spread values ​​associated with the multipath distribution of the channel, wherein the one or more delay spread values ​​are at least partially based on the delay values ​​applied to the scheduled message; as well as The scheduled message is received at least in part based on the channel estimation performed.

15. The UE of claim 14, wherein the first control message includes a Radio Resource Control (RRC) message.

16. The UE of claim 14, wherein the second control message includes a Media Access Control-Control Element (MAC-CE) message.

17. The UE of claim 14, wherein the one or more processors are individually or jointly capable of further operating to execute the code to cause the UE to: Before receiving the second control message, a third control message is received indicating an active delay value set from the plurality of candidate delay values, the active delay value set including the delay values, wherein the active delay value set is mapped to code points in the downlink control information field of the second control message.

18. The UE according to claim 17, wherein, In order to receive the second control message, the one or more processors may individually or jointly further operate to execute the code to enable the UE to: Receive a second control message including the downlink control information field, the downlink control information field indicating the delay value selected from the set of active delay values.

19. The UE of claim 18, wherein the second control message includes a downlink control message, and the third control message includes a Media Access Control-Control Element (MAC-CE) message.

20. The UE of claim 14, wherein the first control message, the second control message, or both are transmitted as part of a transmission configuration indicator (TCI) indication process.

21. A network entity, the network entity comprising: One or more memories, wherein the one or more memories store processor-executable code; and One or more processors, coupled to one or more memories and capable of operating individually or jointly to execute the code to enable the network entity: Obtain the first delay value associated with the small delay cyclic delay diversity (CDD) scheme used for the broadcast channel; Output an indication of the first delay value, wherein the first delay value is associated with a channel estimate for the broadcast channel based on one or more delay spread values ​​associated with the multipath distribution of the broadcast channel, and wherein the one or more delay spread values ​​are at least partially based on the first delay value associated with the low-delay CDD scheme; as well as The message is output via the broadcast channel based at least in part on the indication of the first delay value.

22. The network entity according to claim 21, wherein, In order to obtain the first latency value, the one or more processors can individually or jointly further operate to execute the code to enable the network entity to: The first delay value is selected from a first set of candidate delay values ​​associated with the broadcast channel.

23. The network entity of claim 22, wherein the one or more processors are individually or jointly further operable to execute the code to cause the network entity to: The first set of candidate delay values ​​is selected from a plurality of candidate delay values, at least in part based on the frequency band associated with the broadcast channel.

24. The network entity of claim 21, wherein the first delay value is determined at least in part based on a basic time unit associated with the broadcast channel.

25. The network entity of claim 21, wherein the one or more processors are individually or jointly further operable to execute the code to cause the network entity to: Obtain a second delay value associated with the low-delay CDD scheme used for scheduling the set of control resources via the broadcast channel; Output an indication of the second delay value, wherein the second delay value is associated with a channel estimate for the control resource set; and Control messages are obtained via the control resource set, at least in part, based on the output's indication of the second delay value.

26. The network entity according to claim 25, wherein, In order to obtain the second latency value, the one or more processors can individually or jointly further operate to execute the code to enable the network entity to: The second delay value is selected at least in part based on the first delay value, such that the first delay value and the second delay value are the same.

27. The network entity according to claim 25, wherein, In order to output the message via the broadcast channel, the one or more processors may individually or jointly further operate to execute the code to enable the network entity to: The message indicating the second delay value is output, wherein the output of the indication of the second delay value includes outputting the message via the broadcast channel.

28. The network entity of claim 21, wherein, in order to output the indication of the first delay value, the one or more processors are individually or jointly capable of further operating to execute the code to cause the network entity to: A control message for scheduling the message is output via the broadcast channel, wherein the control message indicates the first delay value.

29. A network entity, the network entity comprising: One or more memories, wherein the one or more memories store processor-executable code; and One or more processors, coupled to one or more memories and capable of operating individually or jointly to execute the code to enable the network entity: Output a first control message indicating multiple candidate delay values ​​associated with a small-delay cyclic delay diversity (CDD) scheme for the channel; Output a second control message indicating the delay value among the plurality of candidate delay values ​​to be applied to the scheduled message; as well as The scheduled message is output at least in part based on the output of the second control message.

30. The network entity of claim 29, wherein the first control message includes a Radio Resource Control (RRC) message.

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