Physical downlink control channel (PDCCH) repetition
Patent Information
- Application Number
- PCT/CN2024/132704
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-10-02
AI Technical Summary
Existing wireless communication systems face challenges in enhancing the transmission of control channels and data channels, particularly in supporting efficient PDCCH repetition to improve communication reliability and coverage.
The implementation of PDCCH repetition in user equipment (UE) and base stations, where the number of repetitions, time resources, and starting positions are determined based on predefined signaling or configurations, allowing for enhanced communication by optimizing PDCCH transmission across different slots or symbols.
This approach enhances communication reliability and coverage by supporting PDCCH repetition, ensuring effective transmission and reception of control signals, thereby improving overall system performance.
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Figure CN2024132704_02102025_PF_FP_ABST
Abstract
Description
PHYSICAL DOWNLINK CONTROL CHANNEL (PDCCH) REPETITIONTECHNICAL FIELD
[0001] The present disclosure relates to wireless communications, and more specifically to a user equipment (UE) , a base station, processors, methods and computer readable media for physical downlink control channel (PDCCH) repetition.BACKGROUND
[0002] A wireless communications system may include one or multiple network communication devices, such as base stations, which may be otherwise known as an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. Each network communication devices, such as a base station may support wireless communications for one or multiple user communication devices, which may be otherwise known as UE, or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) . Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) . There is a still need to enhance the transmission of control channel and data channel.SUMMARY
[0003] The present disclosure relates to a UE, a base station, processors, methods and computer readable media for PDCCH repetition. With the UE, base station, processors and methods, PDCCH repetition is supported, so that communication is enhanced.
[0004] Some implementations of a UE described herein may include a processor and a transceiver coupled to the processor, wherein the processor is configured to: determine a number of physical downlink control channel (PDCCH) repetitions, wherein the number of the PDCCH repetitions is predefined or based on a first received signaling; determine at least one time resource for the PDCCH repetitions, wherein the at least one time resource for the PDCCH repetitions are at different slots or different symbols; determine time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; and receive, from a base station via the transceiver, PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0005] In some implementations, the processor is configured to receive the PDCCH repetitions from a common search space (CSS) .
[0006] In some implementations, the first received signaling comprises one of the following that indicates the number of the PDCCH repetitions: a master information block (MIB) , a system information block 1 (SIB1) , or a radio resource control (RRC) .
[0007] In some implementations, the first received signaling comprises a bit that indicates the number of the PDCCH repetitions, wherein the bit is one of the following: a dedicated bit for indicating the number of the PDCCH repetitions, a reserved bit, or a bit re-interpreted for indicating the number of the PDCCH repetitions.
[0008] In some implementations, the processor is configured to determine the at least one time resource based on one of the following: at least one time domain offset with respect to an existing PDCCH monitoring occasion or a previous PDCCH monitoring occasion, wherein the at least one time domain offset is configured or predefined, a control resource set (CORESET) length, an additional search space or additional sub-search space configuration, or a bitmap for determining PDCCH monitoring occasion.
[0009] In some implementations, the at least one time domain offset is a slot level time domain offset or a symbol level time domain offset.
[0010] In some implementations, the at least one time domain offset is common to the PDCCH repetitions or corresponding to each of the PDCCH repetitions separately.
[0011] In some implementations, the processor is configured to determine the time domain starting position based on at least one of the following: at least one symbol index or slot index which is configured or predefined, a PDCCH monitoring occasion, a PDCCH monitoring periodicity, a PDCCH monitoring offset, the number of the PDCCH repetitions, or a received configuration.
[0012] In some implementations, the at least one symbol index or slot index is indicated by a bitmap.
[0013] In some implementations, in case that a time resource for a PDCCH repetition overlaps with a synchronization signal block (SSB) , the PDCCH is discarded, or the overlapped PDCCH symbol is discarded, or the overlapped PDCCH symbol is postponed.
[0014] In some implementations, a PDCCH crossing a slot boundary or overlapping with another PDCCH monitoring occasion is discarded or postponed.
[0015] In some implementations, the PDCCH monitoring occasion is associated with a different spatial domain filter or reference signal (RS) index.
[0016] In some implementations, the PDCCH repetitions apply a same spatial domain filter.
[0017] In some implementations, the processor is further configured to: receive, from the base station via the transceiver, a signaling related to repetition in initial access procedure; and determine, based on the signaling, a number of message 4 (msg4) physical downlink shared channel (PDSCH) repetitions which are scheduled by the PDCCH.
[0018] In some implementations, the signaling comprises a number of message 3 (msg3) repetitions, and the processor is configured to determine the number of msg4 PDSCH repetitions based on the number of msg3 repetitions.
[0019] In some implementations, the signaling comprises a number of msg4 physical uplink control channel (PUCCH) repetitions, and the processor is configured to determine the number of msg4 PDSCH repetitions based on the number of msg4 PUCCH repetitions.
[0020] In some implementations, the signaling is one of the following: downlink control information (DCI) , a system information block (SIB) , an RRC, or a medium access control control element (MAC CE) .
[0021] In some implementations, the PDCCH comprises a bit for indicating the number of msg4 PDSCH repetitions, wherein the bit is one of the following: a dedicated bit for indicating the number of msg4 PDSCH repetitions, a bit re-interpreted for indicating the number of msg4 PDSCH repetitions.
[0022] In some implementations, the bit re-interpreted for indicating the number of msg4 PDSCH repetitions comprises one of the following: a transmission power control (TPC) command, a time domain resource assignment (TDRA) , a hybrid automatic repeat request (HARQ) process identifier, or a downlink assignment index (DAI) .
[0023] In some implementations, the processor is further configured to: transmit, to the base station via the transceiver, a capability related to the number of msg4 PDSCH repetitions.
[0024] In some implementations, the processor is further configured to: receive, from the base station via the transceiver, a signaling indicating an orthogonal cover code (OCC) sequence index in the PDCCH to be used for a PUSCH transmission. perform the PUSCH transmission based on the OCC sequence index.
[0025] In some implementations, the OCC sequence comprises two parts, wherein one part is applied to time domain and another part is applied to frequency domain.
[0026] In some implementations, the signaling comprises a bit in a DCI that indicate the OCC sequence index.
[0027] In some implementations, the bit in the DCI reuses a bit for a HARQ process id, a demodulation reference signal (DMRS) port index, or a DMRS code-division multiplexing (CDM) group index.
[0028] In some implementations, the processor is further configured to: determine a time domain offset for a starting time domain position of PUSCH to apply the OCC sequence.
[0029] In some implementations, the time domain offset is with respect to a first slot of the PUSCH or a time slot of the PDCCH.
[0030] In some implementations, the processor is configured to determine the time domain offset based on a slot index of the PUSCH.
[0031] In some implementations, a PUSCH with OCC has a higher priority than a RS or a different physical channel in case of overlapping between the PUSCH and the RS or the different physical channel.
[0032] In some implementations, a PUSCH with OCC overlaps with a RS or a different physical channel with a higher priority, the overlapped PUSCH is dropped or both the overlapped PUSCH and an adjacent PUSCH with same OCC sequence are dropped.
[0033] In some implementations, the processor is further configured to: determine a DMRS port index for the PUSCH with OCC based on the OCC sequence index.
[0034] In some implementations, a relationship between the DMRS port index and the OCC sequence index is configured or predefined.
[0035] In some implementations, the UE is operated in a non-terrestrial network.
[0036] Some implementations of a UE described herein may include a processor and a transceiver coupled to the processor, wherein the processor is configured to: determine a number of physical downlink control channel (PDCCH) repetitions; determine at least one time resource for the PDCCH repetitions, wherein the time resources for the PDCCH repetitions are at different slots or different symbols; determine time domain starting positions of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; and transmit, to a user equipment (UE) via the transceiver, PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0037] In some implementations, the number of blind decoding in a slot is impacted by whether there is a repetition or the repetition number in a slot.
[0038] In some implementations, the processor is configured to transmit the PDCCH repetitions in a common search space (CSS) .
[0039] In some implementations, the processor is further configured to: transmit, to the UE via the transceiver, a first signaling indicating the number of PDCCH repetitions.
[0040] In some implementations, the first signaling comprises one of the following that indicates the number of the PDCCH repetitions: a master information block (MIB) , a system information block 1 (SIB1) , or a radio resource control (RRC) .
[0041] In some implementations, the first signaling comprises a bit that indicates the number of the PDCCH repetitions, wherein the bit is one of the following: a dedicated bit for indicating the number of the PDCCH repetitions, a reserved bit, or a bit re-interpreted for indicating the number of the PDCCH repetitions.
[0042] In some implementations, the processor is configured to determine the at least one time resource based on one of the following: at least one time domain offset with respect to an existing PDCCH monitoring occasion or a previous PDCCH monitoring occasion, a control resource set (CORESET) length, an additional search space or additional sub-search space configuration, or a bitmap for determining PDCCH monitoring occasion.
[0043] In some implementation, there may be a configuration indicating linkage between different repetitions or different search space, different sub-search space or different PDCCH monitoring occasions.
[0044] In some implementations, the at least one time domain offset is a slot level time domain offset or a symbol level time domain offset.
[0045] In some implementations, the at least one time domain offset is common to the PDCCH repetitions or corresponding to each of the PDCCH repetitions separately.
[0046] In some implementations, the processor is configured to determine the time domain starting position based on at least one of the following: at least one symbol index or slot index, a PDCCH monitoring occasion, a PDCCH monitoring periodicity, a PDCCH monitoring offset, or the number of the PDCCH repetitions.
[0047] In some implementations, in case that a time resource for a PDCCH repetition overlaps with a synchronization signal block (SSB) , the PDCCH is discarded, or the overlapped PDCCH symbol is discarded, or the overlapped PDCCH symbol is postponed.
[0048] In some implementations, a PDCCH crossing a slot boundary or overlapping with another PDCCH monitoring occasion is discarded or postponed.
[0049] In some implementations, the PDCCH monitoring occasion is associated with a different spatial domain filter or reference signal (RS) index.
[0050] In some implementations, the PDCCH repetitions apply a same spatial domain filter.
[0051] In some implementations, the processor is further configured to: transmit, to the UE via the transceiver, a signaling related to repetition in initial access procedure; and determine a number of message 4 (msg4) physical downlink shared channel (PDSCH) repetitions which are scheduled by the PDCCH.
[0052] In some implementations, the signaling comprises a number of message 3 (msg3) repetitions for determining the number of msg4 PDSCH repetitions.
[0053] In some implementations, the signaling comprises a number of msg4 PUCCH repetitions for determining the number of msg4 PDSCH repetitions.
[0054] In some implementations, the signaling is one of the following: downlink control information (DCI) , a system information block (SIB) , a radio resource control (RRC) , or a medium access control control element (MAC CE) .
[0055] In some implementations, the DCI comprises a bit for indicating the number of msg4 PDSCH repetitions, wherein the bit is one of the following: a dedicated bit for indicating the number of msg4 PDSCH repetitions, a bit re-interpreted for indicating the number of msg4 PDSCH repetitions.
[0056] In some implementations, the bit re-interpreted for indicating the number of msg4 PDSCH repetitions comprises one of the following: a transmission power control (TPC) command, a time domain resource assignment (TDRA) , a hybrid automatic repeat request (HARQ) process identifier, or a downlink assignment index (DAI) .
[0057] In some implementations, the processor is further configured to: receive, from the UE via the transceiver, a capability related to the number of msg4 PDSCH repetitions.
[0058] In some implementations, the processor is further configured to: transmit, to the UE via the transceiver, a signaling indicating an orthogonal cover code (OCC) sequence index in the PDCCH to be used for a PUSCH transmission. receive, from the UE via the transceiver, the PUSCH transmission based on the OCC sequence index.
[0059] In some implementations, the OCC sequence comprises two parts, wherein one part is applied to time domain and another part is applied to frequency domain.
[0060] In some implementations, the signaling comprises a bit in a DCI that indicate the OCC sequence index.
[0061] In some implementations, the bit in the DCI reuses a bit for a HARQ process identifier, a demodulation reference signal (DMRS) port index, or a DMRS code-division multiplexing (CDM) group index.
[0062] In some implementations, the processor is further configured to: determine a time domain offset indicating a starting time domain position to apply the OCC sequence.
[0063] In some implementations, the time domain offset is with respect to a first slot of the PUSCH or a time slot of the PDCCH.
[0064] In some implementations, wherein the processor is configured to determine the time domain offset based on a slot index of the PUSCH.
[0065] In some implementations, a PUSCH with OCC has a higher priority than a RS or a different physical channel in case of overlapping between the PUSCH and the RS or the different physical channel.
[0066] In some implementations, a PUSCH with OCC overlaps with a RS or a different physical channel with a higher priority, the overlapped PUSCH is dropped or the overlapped PUSCH and an adjacent PUSCH with same OCC sequence group are dropped.
[0067] In some implementations, the processor is further configured to: determine a DMRS port index for the PUSCH with OCC based on the OCC sequence index.
[0068] In some implementations, a relationship between the DMRS port index and the OCC sequence index is configured or predefined.
[0069] In some implementations, the base station is operated in a non-terrestrial network.
[0070] Some implementations of a method described herein may include: determining, a number of physical downlink control channel (PDCCH) repetitions, wherein the number of the PDCCH repetitions is predefined or based on a first received signaling; determining, at least one time resource for the PDCCH repetitions, wherein the at least one time resource for the PDCCH repetitions are at different slots or different symbols; determining, time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; and receiving, from a base station, PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0071] Some implementations of a method described herein may include: determining, a number of physical downlink control channel (PDCCH) repetitions; determining, at least one time resource for the PDCCH repetitions, wherein the time resources for the PDCCH repetitions are at different slots or different symbols; determining, time domain starting positions of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; and transmitting, to a user equipment (UE) , PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0072] Some implementations of a processor described herein may include at least one memory and a controller coupled with the at least one memory and configured to cause the controller to: determine a number of physical downlink control channel (PDCCH) repetitions, wherein the number of the PDCCH repetitions is predefined or based on a first received signaling; determine at least one time resource for the PDCCH repetitions, wherein the at least one time resource for the PDCCH repetitions are at different slots or different symbols; determine time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; and receive, from a base station, PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0073] Some implementations of a processor described herein may include at least one memory and a controller coupled with the at least one memory and configured to cause the controller to: determine a number of physical downlink control channel (PDCCH) repetitions; determine at least one time resource for the PDCCH repetitions, wherein the time resources for the PDCCH repetitions are at different slots or different symbols; determine time domain starting positions of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; and transmit, to a user equipment (UE) , PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0074] It is to be understood that the summary section is not intended to identify key or essential features of embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS
[0075] Fig. 1 illustrates an example of a wireless communications system for PDCCH repetition in accordance with aspects of the present disclosure;
[0076] Fig. 2 illustrates a signaling chart illustrating an example process for PDCCH repetition in accordance with aspects of the present disclosure;
[0077] Fig. 3 illustrates a diagram illustrating an example of PDCCH repetition in accordance with aspects of the present disclosure;
[0078] Fig. 4 illustrates a diagram illustrating an example of PDCCH repetition in accordance with aspects of the present disclosure;
[0079] Fig. 5 illustrates a signaling chart illustrating an example process for msg4 PDSCH repetition in accordance with aspects of the present disclosure;
[0080] Fig. 6 illustrates a signaling chart illustrating an example process for OCC indication in accordance with aspects of the present disclosure;
[0081] Fig. 7 illustrates an example of a device for PDCCH repetition in accordance with aspects of the present disclosure;
[0082] Fig. 8 illustrates an example of a processor for PDCCH repetition in accordance with aspects of the present disclosure;
[0083] Fig. 9 illustrates a flowchart of a method for PDCCH repetition in accordance with aspects of the present disclosure;
[0084] Fig. 10 illustrates a flowchart of another method for PDCCH repetition in accordance with aspects of the present disclosure;
[0085] Fig. 11 illustrates a flowchart of a method for msg4 PDSCH repetition in accordance with aspects of the present disclosure;
[0086] Fig. 12 illustrates a flowchart of another method for msg4 PDSCH repetition in accordance with aspects of the present disclosure;
[0087] Fig. 13 illustrates a flowchart of a method for OCC indication in accordance with aspects of the present disclosure; and
[0088] Fig. 14 illustrates a flowchart of another method for OCC indication in accordance with aspects of the present disclosure.DETAILED DESCRIPTION
[0089] Principles of the present disclosure will now be described with reference to some embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein may be implemented in various manners other than the ones described less than or equal to.
[0090] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.
[0091] References in the present disclosure to “one embodiment, ” “an example embodiment, ” “an embodiment, ” “some embodiments, ” and the like indicate that the embodiment (s) described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment (s) . Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
[0092] It shall be understood that although the terms “first” and “second” or the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could also be termed as a second element, and similarly, a second element could also be termed as a first element, without departing from the scope of embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.
[0093] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” , “comprising” , “has” , “having” , “includes” and / or “including” , when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.
[0094] In view of the above, some embodiments of the present disclosure provide a solution for PDCCH repetition. In this solution, a UE determines a number of PDCCH repetitions. The number of the PDCCH repetitions is predefined or based on a first received signalling. The UE determines at least one time resource for the PDCCH repetitions. The at least one time resource for the PDCCH repetitions are at different slots or different symbols. The UE determines a time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions. The UE receives, from a base station, PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource. With this solution, PDCCH repetition is supported, so that communication is enhanced.
[0095] Aspects of the present disclosure are described in the context of a wireless communications system.
[0096] Fig. 1 illustrates an example of a wireless communications system 100 for PDCCH repetition in accordance with aspects of the present disclosure. The wireless communications system 100 may include one at least one of network entities 102 (also referred to as network equipment (NE) ) , one or more terminal devices or UEs 104, a core network 106, and a packet data network 108. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a 5G network, such as an NR network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including institute of electrical and electronics engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
[0097] The network entities 102 may be collectively referred to as network entities 102 or individually referred to as a network entity 102.
[0098] The network entities 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the network entities 102 described herein may be or include or may be referred to as a network node, a base station (BS) , a network element, a radio access network (RAN) node, a base transceiver station, an access point, a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. A network entity 102 and a UE 104 may communicate via a communication link 110, which may be a wireless or wired connection. For example, a network entity 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface. The network entities 102 may be collectively referred to as network entities 102 or individually referred to as a network entity 102. Hereinafter, some implementations of the present disclosure will be described by taking a base station as an example of the network entity 102. Thus, the network entity 102 may be used interchangeably with the base station 102.
[0099] A network entity 102 may provide a geographic coverage area 112 for which the network entity 102 may support services (e.g., voice, video, packet data, messaging, broadcast, etc. ) for one or more UEs 104 within the geographic coverage area 112. For example, a network entity 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies. In some implementations, a network entity 102 may be moveable, for example, a satellite associated with a non-terrestrial network. In some implementations, different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas 112 may be associated with different network entities 102. Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0100] The one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a mobile device, a wireless device, a remote device, a remote unit, a handheld device, or a subscriber device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an internet-of-things (IoT) device, an internet-of-everything (IoE) device, or machine-type communication (MTC) device, among other examples. In some implementations, a UE 104 may be stationary in the wireless communications system 100. In some other implementations, a UE 104 may be mobile in the wireless communications system 100.
[0101] The one or more UEs 104 may be devices in different forms or having different capabilities. Some examples of UEs 104 are illustrated in Fig. 1. A UE 104 may be capable of communicating with various types of devices, such as the network entities 102, other UEs 104, or network equipment (e.g., the core network 106, the packet data network 108, a relay device, an integrated access and backhaul (IAB) node, or another network equipment) , as shown in Fig. 1. Additionally, or alternatively, a UE 104 may support communication with other network entities 102 or UEs 104, which may act as relays in the wireless communications system 100.
[0102] A UE 104 may also be able to support wireless communication directly with other UEs 104 over a communication link 114. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link 114 may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface. A UE 104 may be an A-IoT device.
[0103] A network entity 102 may support communications with the core network 106, or with another network entity 102, or both. For example, a network entity 102 may interface with the core network 106 through one or more backhaul links 116 (e.g., via an S1, N2, N3, or another network interface) . The network entities 102 may communicate with each other over the backhaul links 116 (e.g., via an X2, Xn, or another network interface) . In some implementations, the network entities 102 may communicate with each other directly (e.g., between the network entities 102) . In some other implementations, the network entities 102 may communicate with each other or indirectly (e.g., via the core network 106) . In some implementations, one or more network entities 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) . An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs) . A network entity 102 may be a reader for an A-IoT device.
[0104] In some implementations, a network entity 102 may be configured in a disaggregated architecture, which may be configured to utilize a protocol stack physically or logically distributed among two or more network entities 102, such as an integrated access backhaul (IAB) network, an open radio access network (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 102 may include one or more of a central unit (CU) , a distributed unit (DU) , a radio unit (RU) , a RAN intelligent controller (RIC) (e.g., a near-real time RIC (Near-RT RIC) , a non-real time RIC (Non-RT RIC) ) , a service management and orchestration (SMO) system, or any combination thereof.
[0105] An RU may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) . One or more components of the network entities 102 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 102 may be located in distributed locations (e.g., separate physical locations) . In some implementations, one or more network entities 102 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
[0106] Split of functionality between a CU, a DU, and an RU may be flexible and may support different functionalities depending upon which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof) are performed at a CU, a DU, or an RU. For example, a functional split of a protocol stack may be employed between a CU and a DU such that the CU may support one or more layers of the protocol stack and the DU may support one or more different layers of the protocol stack. In some implementations, the CU may host upper protocol layer (e.g., a layer 3 (L3) , a layer 2 (L2) ) functionality and signaling (e.g., radio resource control (RRC) , service data adaption protocol (SDAP) , packet data convergence protocol (PDCP) ) . The CU may be connected to one or more DUs or RUs, and the one or more DUs or RUs may host lower protocol layers, such as a layer 1 (L1) (e.g., physical (PHY) layer) or an L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160.
[0107] Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU and an RU such that the DU may support one or more layers of the protocol stack and the RU may support one or more different layers of the protocol stack. The DU may support one or multiple different cells (e.g., via one or more RUs) . In some implementations, a functional split between a CU and a DU, or between a DU and an RU may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU, a DU, or an RU, while other functions of the protocol layer are performed by a different one of the CU, the DU, or the RU) .
[0108] A CU may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU may be connected to one or more DUs via a midhaul communication link (e.g., F1, F1-c, F1-u) , and a DU may be connected to one or more RUs via a fronthaul communication link (e.g., open fronthaul (FH) interface) . In some implementations, a midhaul communication link or a fronthaul communication link may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 102 that are in communication via such communication links.
[0109] The core network 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The core network 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management functions (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a packet data network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more network entities 102 associated with the core network 106.
[0110] The core network 106 may communicate with the packet data network 108 over one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) . The packet data network 108 may include an application server 118. In some implementations, one or more UEs 104 may communicate with the application server 118. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the core network 106 via a network entity 102. The core network 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server 118 using the established session (e.g., the established PDU session) . The PDU session may be an example of a logical connection between the UE 104 and the core network 106 (e.g., one or more network functions of the core network 106) .
[0111] In the wireless communications system 100, the network entities 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) ) to perform various operations (e.g., wireless communications) . In some implementations, the network entities 102 and the UEs 104 may support different resource structures. For example, the network entities 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the network entities 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the network entities 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) . The network entities 102 and the UEs 104 may support various frame structures based on one or more numerologies.
[0112] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g., μ=0) may be associated with a first subcarrier spacing (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., μ=0) associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., μ=1) may be associated with a second subcarrier spacing (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., μ=2) may be associated with a third subcarrier spacing (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., μ=3) may be associated with a fourth subcarrier spacing (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., μ=4) may be associated with a fifth subcarrier spacing (e.g., 240 kHz) and a normal cyclic prefix.
[0113] A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames) . Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.
[0114] Additionally or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., μ=0, μ=1, μ=2, μ=3, μ=4) associated with respective subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols) . In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15 kHz) may be used interchangeably between subframes and slots.
[0115] In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (510 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz –300 GHz) . In some implementations, the network entities 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the network entities 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data) . In some implementations, FR2 may be used by the network entities 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
[0116] FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) . For example, FR1 may be associated with a first numerology (e.g., μ=0) , which includes 15 kHz subcarrier spacing; a second numerology (e.g., μ=1) , which includes 30 kHz subcarrier spacing; and a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) . For example, FR2 may be associated with a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g., μ=3) , which includes 120 kHz subcarrier spacing.
[0117] Fig. 2 illustrates a signaling chart illustrating an example process 200 for PDCCH repetition in accordance with aspects of the present disclosure. The process 200 may involve the UE 104 and the base station 102. For the purpose of discussion, the process 200 will be described with reference to Fig. 1. With the process 200, PDCCH repetition may be supported, so that communication may be enhanced.
[0118] As shown in Fig. 2, the UE 104 may determine 210 a number of physical downlink control channel (PDCCH) repetitions. The base station 102 may also determine 215 the number of the PDCCH repetitions. In some implementations, a number of repetitions may also be referred to as a repetition number or a repetition factor.
[0119] In some implementations, the number of the PDCCH repetitions may be predefined. In some other implementations, the number of the PDCCH repetitions may be based on a first received signaling.
[0120] In some implementations, the first received signaling comprises a master information block (MIB) that indicates the number of the PDCCH repetitions. The MIB may have 8 bits. First 4 bits may mainly focus on a frequency domain configuration of CORESET#0. Other 4 bits may mainly focus on a time domain configuration of COREST#0. The repetition number can be combined with tables. There can slo be some predefined rules to determine the repetition number for PDCCH repetition. The reserved bits in MIB can also be used to indicate the repetition number for PDCCH repetition. After determining the repetition number, a time or frequency domain allocation for CORESET#0 can be determined.
[0121] In some other implementations, the first received signaling may comprise a system information block (SIB) (e.g. SIB1) that indicates the number of the PDCCH repetitions. In some implementations, the PDCCH repetition information may be configured in PDCCH-ConfigCommon. In some implementations, the system information may have enough bits, and there may be configuration for CORESET to configure the time or frequency resource block for a CORESET, and search space to configure time domain position of the PDCCH monitoring occasion. Repetition related information may be configured in CORESET configuration or in search space configuration.
[0122] In some other implementations, the first received signaling may comprise a radio resource control (RRC) that indicates the number of the PDCCH repetitions.
[0123] In some implementations, the first received signaling comprises a bit that indicates the number of the PDCCH repetitions. In some implementations, the bit is a dedicated bit for indicating the number of the PDCCH repetitions. For example, the bit is a new bit. In some other implementations, the bit is a reserved bit. For example, the bit is a reserved bit in standards and is used for indicating the number of the PDCCH repetitions in embodiments of the present disclosure. In some other implementations, the bit is a bit re-interpreted for indicating the number of the PDCCH repetitions. For example, the bit is used for other purpose in standards, but may be re-interpreted for indicating the number of the PDCCH repetitions in implementations of the present disclosure.
[0124] As shown in Fig. 2, the UE 104 may determine 220 at least one time resource for the PDCCH repetitions. The base station 102 may also determine 225 the at least one time resource for the PDCCH repetitions. In some implementations, the at least one time resource for the PDCCH repetitions may be at different slots or different symbols.
[0125] In some implementations, the UE 104 and / or the base station 102 may determine the at least one time resource based on at least one time domain offset with respect to a PDCCH monitoring occasion or a previous PDCCH monitoring occasion. The PDCCH monitoring occasion can be one configured by legacy signaling. In some implementations, the at least one time domain offset is configured or predefined. In some implementations, the at least one time domain offset is a slot level time domain offset or a symbol level time domain offset. In some implementations, the at least one time domain offset is common to the PDCCH repetitions or alternatively there will be different time domain offset for different PDCCH repetitions.
[0126] As shown in Fig. 2, the UE 104 may determine 230 a time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions. The base station 102 may also determine 235 the time domain starting position.
[0127] In some implementations, the UE 104 and / or the base station 102 may determine the time domain starting position based on at least one symbol index or slot index which is configured or predefined. In some implementations, the at least one symbol index or slot index is indicated by a bitmap.
[0128] In some other implementations, the UE 104 and / or the base station 102 may determine the time domain starting position based on a PDCCH monitoring occasion, e.g. a PDCCH monitoring occasion configured by legacy signaling. In some other implementations, the UE 104 and / or the base station 102 may determine the time domain starting position based on a PDCCH monitoring periodicity. In some other implementations, the UE 104 and / or the base station 102 may determine the time domain starting position based on a PDCCH monitoring offset. In some other implementations, the UE 104 and / or the base station 102 may determine the time domain starting position based on the number of the PDCCH repetitions. In some other implementations, the UE 104 may determine the time domain starting position based on a received configuration.
[0129] As shown in Fig. 2, the base station 102 may transmit 240, to the UE 104, PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource. Accordingly, the UE 104 may receive, from the base station 102, the PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0130] In some implementations, the UE 104 may receive the PDCCH repetitions from a common search space (CSS) . In some implementations, PDCCH CSS may include Type 0 for SIB1, Type 0A for OSI, Type 0B for multicast, Type 1 for random access channel (RACH) , Type 1A for small data transmission (SDT) , Type 2 for paging, Type 2A for paging early indication (PEI) , Type 3 for other CSS.
[0131] In some implementations, in case that a time resource for a PDCCH repetition overlaps with a synchronization signal block (SSB) , the PDCCH may be discarded (or referred to as dropped) , or the overlapped PDCCH symbol may be discarded. That is, the whole PDCCH or only the overlapped symbol may be discarded. In some other implementations, the overlapped PDCCH symbol or the whole PDCCH may be postponed (or referred to as delayed) . In some implementations, the overlapped PDCCH symbol is postponed until there is no overlapping with SSB.
[0132] In some implementations, a PDCCH crossing a slot boundary is discarded or postponed. In some implementations, the PDCCH cannot cross slot boundary. If the remaining symbols in a slot is less than that of a PDCCH, then it may start from the next slot boundary. For example, if there is one more repetition which occupies 3 symbols, and the slot#0 only has 2 symbols left, so that this repetition may be located at symbol 0 to symbol 2 of the next slot (i.e. slot#1) . In some other embodiments, the time domain pattern can cross slot boundary. In this case, this repetition may be located at symbol 12, symbol 13 of the slot#0 and symbol 0 of the slot#1.
[0133] In some implementations, a PDCCH overlapping with another PDCCH monitoring occasion is discarded or postponed. The another PDCCH monitoring occasion can be configured by another signaling, legacy signaling or associated with a different spatial domain filter. In some implementations, the PDCCH monitoring occasion is associated with a different spatial domain filter or reference signal (RS) index.
[0134] In some implementations, the UE 104 and / or the base station 102 may determine the at least one time resource based on a control resource set (CORESET) length. In some implementations, a time domain pattern is based on number of units based on CORESETs and steps / time domain durations between adjacent CORESETs. A number of CORESETs may be same as the repetition number or factor. For example, a legacy CORESET has time domain duration of 3 symbols, then an extended time domain duration of CORESETs is multiple of 3 symbols, and there can be time domain durations between adjacent 3 symbols group. In some implementations, the pattern can or cannot cross slot boundary. If it cannot cross slot boundary, then if the remaining symbols in a slot is less than that of the legacy CORESET, then it will start from the next slot boundary. In some other implementations, the time domain pattern may be based on COREST configuration, and the time domain position of each COREST may be flexible configured. In this way, it may be friendlier for normal UEs (e.g. legacy UEs) . In some implementations, there may be multiple patterns corresponding to different repetition numbers. In some implementations, the pattern may be designed per slot. And if the number of units based on COREST is less than the repetition number, then a new slot may be occupied. It is to be understood that a time domain starting position of PDCCH monitoring occasion according to the CORSET with a longer length is still based on PDCCH monitoring configuration in search space. The implementations are only to determine the relative time domain position with reference to the starting position of PDCCH monitoring occasion determined based on normal configuration (e.g. a legacy configuration) in search space or with reference to a previous PDCCH monitoring occasion. For example, if the CORESET time duration is 3 symbols, starting position is symbol 3 in slot#1 based on a legacy search space configuration, and if repetition number is 2, and the offset is 3 symbols, then the two starting PDCCH position for PDCCH monitoring occasion may be symbol 3 in slot#1 and symbol 6 in slot#1.
[0135] In some implementations, the base station 102 may transmit additional information for COREST configuration to a UE that supports PDCCH repetition. The base station 102 may transmit the pattern by new bits to the UE that supports PDCCH repetition. The new bits may be not used for the UE that does not support PDCCH repetition (e.g. a legacy UE) .
[0136] In some other implementations, the pattern corresponding to different repetition number is predefined (e.g. in 3GPP specifications) , and the UE that supports PDCCH repetition and the UE that does not support PDCCH repetition may interpret bits in configuration signaling by different ways.
[0137] In some other implementations, the UE 104 and / or the base station 102 may determine the at least one time resource based on additional search space or additional sub-search space configuration. In this case, a CORESET configuration may be same as normal configuration (e.g. in a legacy release of 3GPP specifications) . For each search space or each sub-search space configuration, there may be an associated search space configuration. A time domain offset between the associated search space and a first sub-search / search space may be configured. For each sub-search / search space, there may be a configuration of a time domain offset with reference to the associated search space. For each sub-search / search space, the associated search space id may also be configured so that the associated search space and the sub-search / search space may be used for PDCCH repetition together.
[0138] In some implementations, depending on different repetition number, there may be different number of sub-search spaces or search spaces linked with the associated search space. The time domain offset (symbol level or slot level) between adjacent sub-search / search space may also be configured or predefined.
[0139] In case there is slot boundary, sub-search / search space may be delayed to start from the next slot boundary.
[0140] In case there is overlapping with SSB or search space configured by legacy signaling, the sub-search / search space may be delayed by the number of SSB symbols or the number of sub-search space symbols.
[0141] In some implementations, the repetition may always start from the associated search space. Or all of the search space and the sub-search space / space will be indexed based on the time domain position, and the repetition may start from a sub-search / search space with index. The index can be configured or predefined, e.g. the starting position is index t, where t mod (repetition factor) =predefined value (e.g., 0) .
[0142] In some other implementations, the UE 104 and / or the base station 102 may determine the at least one time resource based on a bitmap for determining PDCCH monitoring occasion. In some implementations, CORSET configuration and search space configuration may be same as normal configurations (e.g. in a legacy release of 3GPP specifications) . In some implementations, there may be a linkage or association between different PDCCH monitoring occasions.
[0143] Regarding how to determine a number of blind decoding of the UE 104, it may depend on different repetitions. A number of repetitions can be assumed by UE or indicated to UE. For instance, for a PDCCH repetition with 4 PDCCH monitoring occasions, if the UE 104 tries repetition number 1 / 2 / 4, then the number of blind decoding will be counted 3 times. If the UE 104 is indicated that the repetition number is 4, then the number of blind decoding may be counted as 1. In some implementations, the number of blind decoding will be considered when reporting corresponding UE capability.
[0144] In some implementations, there may be indexing or association for each “1” bit in the search space configuration to determine each PDCCH monitoring occasion. In some implementations, there may be legacy bitmap or a new bitmap may be introduced, and PDCCH repetition may be based on “1” bits associated with the new bitmap. In some implementations, PDCCH monitoring occasions may be indexed from a starting position.
[0145] In some implementations, an index may be configured or predefined to be the starting of a repetition. And remaining indices for a repetition may be determined to be following ones beginning from the starting index. For example, a starting index for repetition is configured to be 2. If the repetition number is 2, then the PDCCH monitoring occasion with index 2 and 3 may be used. If the repetition number is 4, then the PDCCH monitoring occasion with index 2, 3, 4, 5 may be used. In this way, no new time resource for PDCCH monitoring occasion is occupied. In some implementations, the starting index and corresponding repetition factor may be configured for the UE 104 in SIB1.
[0146] In some implementations, the UE 104 may determine PDCCH monitoring occasions for the PDCCH repetitions based on determine available symbols in a slot. In some implementations, based on the indicated 8 bits for COREST#0 configuration in the MIB, possible first symbol in a slot may be determined, and additional first symbol in a slot may be determined accordingly. The total set of first symbols is predefined / configured, e.g. to be 0, CORESET length, 7, 7+ CORESET length. For example, if symbol 0 is determined by the 8 bits, based on the total set of available symbols in a slot, and CORESET length is 3 symbols, then 3 and 7, 10 may be considered as additional first symbols. For instance, if symbol 7 is determined by the 8 bits, based on the total set of available symbols in a slot, and CORESET length is 3 symbols, then 0 and 3, 10 may be considered as additional first symbols. In some implementations, the additional first symbols may be considered as CORESET length extension, additional search space or additional PDCCH monitoring occasion. In some implementations, the additional first symbols may be considered as available symbols.
[0147] In some other implementations, for all slots within 20ms (i.e. two SFN) , different SSB index may be associated with different slot index. Firstly, all slots associated with all SSB indices in corresponding frequency band may be identified. In this step, slots without association with any SSB index may be considered as available. And then based on SSB index configuration in system information, slots associated with non-occupied SSB index may be considered to be available. And then available slots may be determined. The available symbols in available slots may be the full set, i.e. (0, CORESET length, 7, 7+ CORESET length) . The available symbols for other slots may be the full set excluding the first symbol corresponding to SSB index in the corresponding slot. And then, all first symbols in all slots within 20ms may be determined, and the first symbol and slot index corresponding to each SSB index may also be determined. The available slot or available symbols in each slot can also be configured.
[0148] For each SSB index, a PDCCH monitoring occasion may be determined based on legacy signaling. The remaining PDCCH monitoring occasions may be determined to be the next nearest one or more PDCCH monitoring occasions. I. e. staring of PDCCH repetition may be the PDCCH monitoring occasion determined by legacy signaling. Whether it is one or more may depend on the repetition factor configuration. PDCCH monitoring occasions of the PDCCH repetition can also be configured.
[0149] Each PDCCH monitoring occasion may be determined based on the available symbols for each corresponding slot.
[0150] If there is overlap with a PDCCH monitoring occasion with a different SSB index, the PDCCH monitoring occasion may be considered to be non-available for the PDCCH repetition. And the PDCCH repetition may be stopped.
[0151] In some implementations, the base station 102 may perform PDCCH repetition based on a largest repetition factor, and the UE 103 may select to decode 2, 4 or 8 repetitions or no repetition, e.g. based on received SINR. The PDCCH repetition factor may be configured in MIB. And the UE may determine corresponding PDCCH monitoring occasion based on its capability or channel status. It may be indicated by reserved bits in MIB or by some of SSB index indication bits if only part of SSB index may be supported in the base station 102, e.g. there may be only 1 beam may be used for a geographical area or by reusing the existing 8 bits in MIB, e.g. by some reserved codepoints or by adding a new column indicating repetition factor to the existing table. In this way, backward compatibility may be guaranteed.
[0152] In some implementations, the PDCCH repetitions may apply a same spatial domain filter. That is, the PDCCH repetitions may be in a same beam. E. g. if there are the PDCCH repetition factor is 4, then the 1st, 2nd, 3rd and 4th PDCCH will be associated with a same spatial domain filter. In some implementations, the spatial domain filter is configured for a legacy PDCCH.
[0153] In some implementations, the UE 104 and / or the base station 102 may be operated in a non-terrestrial network.
[0154] Fig. 3 illustrates a diagram illustrating an example of PDCCH repetition in accordance with aspects of the present disclosure. As shown in Fig. 3, a legacy CORESET 320 may have a time domain duration of 3 symbols, and may be located at symbol 0 to symbol 2 in slot#0. The repetition number may be 4, so that the number of units of CORESETs 330 may be 4. In some implementations, the CORESETs are continuous. In some implementations, there may be steps between adjacent 3 symbols group. In some implementations, there is SSB in system information 310 that overlaps with a CORESET. In some implementations, the CORESET may be delayed, as shown by delayed CORESET 340. In some other implementations, the CORESET may be discarded, as shown by discarded CORESETs 350.
[0155] Fig. 4 illustrates a diagram illustrating an example of PDCCH repetition in accordance with aspects of the present disclosure. As shown in Fig. 4, the repetition number may be 4, start position of each CORESET may be symbol 0, 3, 7, and 10. In some implementations, there is SSB in system information 410 that overlaps with a CORESET. In some implementations, the CORESET may be delayed, as shown by delayed CORESET 440. In some other implementations, the CORESET may be punctured, as shown by punctured CORESETs 430.
[0156] Fig. 5 illustrates a signaling chart illustrating an example process 500 for msg4 PDSCH repetition in accordance with aspects of the present disclosure. The process 500 may involve the UE 104 and the base station 102. For the purpose of discussion, the process 500 will be described with reference to Fig. 1. With the process 500, msg4 PDSCH repetition may be supported, so that communication may be enhanced.
[0157] As shown in Fig. 5, the base station 102 may transmit 510, to the UE 104, a signaling related to repetition in initial access procedure. Accordingly, the UE 104 may receive, from the base station 102, the signaling related to repetition in initial access procedure.
[0158] In some implementations, the signaling may be downlink control information (DCI) . In some other implementations, the signaling may be a system information block (SIB) . In some other implementations, the signaling may be an RRC. In some other implementations, the signaling may be a medium access control control element (MAC CE) .
[0159] As shown in Fig. 5, the UE 104 may determine 520, based on the signaling, a number of message 4 (msg4) physical downlink shared channel (PDSCH) repetitions. The base station 102 may also determine 525 the number of the msg4 PDSCH repetitions. It is to be understood that the base station 102 may determine 525 the number before or after transmitting 510 the signaling.
[0160] In some implementations, the msg4 PDSCH repetitions may be scheduled by the PDCCH.
[0161] In some implementations, the PDCCH may comprise a bit for indicating the number of msg4 PDSCH repetitions. In some implementations, the bit is a dedicated bit for indicating the number of msg4 PDSCH repetitions. That is, the bit is a new bit that is not in legacy standards. In some other implementations, the bit is a bit re-interpreted for indicating the number of msg4 PDSCH repetitions. That is, the bit is used for other purpose in legacy standards, but may be re-interpreted for indicating the number of msg4 PDSCH repetitions in implementations of the present disclosure.
[0162] In some implementations, the bit re-interpreted for indicating the number of msg4 PDSCH repetitions may comprise a transmission power control (TPC) command. In some other implementations, the bit re-interpreted for indicating the number of msg4 PDSCH repetitions may comprise a time domain resource assignment (TDRA) . In some other implementations, the bit re-interpreted for indicating the number of msg4 PDSCH repetitions may comprise a hybrid automatic repeat request (HARQ) process identifier. In some other implementations, the bit re-interpreted for indicating the number of msg4 PDSCH repetitions may comprise a downlink assignment index (DAI) .
[0163] In some implementations, the signaling may comprise a number of message 3 (msg3) repetitions, and the UE 104 may determine the number of msg4 PDSCH repetitions based on the number of msg3 repetitions. In some implementations, the number of msg4 PDSCH repetitions may be same as the number of msg3 repetitions. In some other implementations, the UE 104 may determine the number of msg4 PDSCH repetitions based on the number of msg3 repetitions and a relationship configured or predefined between the number of msg4 PDSCH repetitions and the number of msg3 repetitions. In some implementations, the number of msg3 repetitions may be indicated by modulation and coding scheme (MCS) bits in random access response (RAR) .
[0164] In some implementations, the signaling may comprise a number of msg4 PUCCH repetitions, and the UE 104 may determine the number of msg4 PDSCH repetitions based on the number of msg4 PUCCH repetitions. In some implementations, the number of msg4 PDSCH repetitions may be same as the number of msg4 PUCCH repetitions. In some other implementations, the UE 104 may determine the number of msg4 PDSCH repetitions based on the number of msg4 PUCCH repetitions and a relationship configured or predefined between the number of msg4 PDSCH repetitions and the number of msg4 PUCCH repetitions. In some implementations, the number of msg4 PUCCH repetitions may be indicated by DAI bits in PDCCH scheduling msg4.
[0165] In some implementations, the UE 104 may transmit, to the base station 102, a capability related to the number of msg4 PDSCH repetitions. Accordingly, the base station 102 may receive, from the UE 104, the capability. In some implementations, the capability may also be related to the number of msg4 PUCCH repetitions. That is, a capability related to the number of msg4 PUCCH repetitions may be reused for the number of msg4 PDSCH repetitions.
[0166] In some implementations, the base station 102 may transmit, to the UE 104, a configuration for supported number of msg4 PDSCH repetitions. Accordingly, the UE 104 may receive, from the base station 102, the configuration. In some implementations, the configuration may reuse a configuration for supported number of msg4 PUCCH repetitions.
[0167] In some implementations, the UE 104 and / or the base station 102 may be operated in a non-terrestrial network.
[0168] Fig. 6 illustrates a signaling chart illustrating an example process 600 for OCC indication in accordance with aspects of the present disclosure. The process 600 may involve the UE 104 and the base station 102. For the purpose of discussion, the process 600 will be described with reference to Fig. 1. With the process 600, an OCC sequence may be applied to time domain and / or frequency domain, so that communication may be enhanced.
[0169] As shown in Fig. 6, the base station 102 may transmit 610, to the UE 104, a signaling indicating an orthogonal cover code (OCC) sequence index in a PDCCH to be used for a PUSCH transmission. Accordingly, the UE 104 may receive, from the base station 102, the signaling. The UE 104 may perform 620 the PUSCH transmission based on the OCC sequence index. Accordingly, the base station 102 may receive, from the UE 104, the PUSCH transmission.
[0170] In some implementations, the OCC sequence may comprise two parts. One part may be applied to time domain (inter-slot OCC) and another part may be applied to frequency domain (intra-symbol OCC) . For example, for an OCC sequence with a length 4, first 2 elements may be applied to different slots, and last 2 elements may be associated with intra-symbol OCC, i.e. to determine different comb value.
[0171] In some implementations, the signaling may comprise a bit in a DCI that indicate the OCC sequence index. In some implementations, the bit in the DCI may reuse a bit for a HARQ process identifier, a demodulation reference signal (DMRS) port index, or a DMRS code-division multiplexing (CDM) group index. In some implementations, the bit may be a dedicated bit for indicating the OCC sequence index. That is, the bit may be a new bit that is not in legacy standards.
[0172] In some implementations, the signaling may comprise a bit in a DCI 0-0 that indicate the OCC sequence index. In some implementations, the bit in the DCI 0-0 may reuse a bit for a TPC command, a HARQ process identifier, a MCS, or a TDRA. In some other implementations, the bit may be a dedicated bit for indicating the OCC sequence index. That is, the bit may be a new bit that is not in normal standards.
[0173] In some implementations, the signaling may comprise a bit in an RAR that indicate the OCC sequence index. In some implementations, the bit in the RAR may reuse a bit for a TPC command or a PUSCH time allocation. In some other implementations, the bit may be a dedicated bit for indicating the OCC sequence index. That is, the bit may be a new bit that is not in legacy standards. In some other implementations, the bit may be a reserved bit. That is, the bit may be a reserved bit in legacy standards and used for indicating the OCC sequence index in embodiments of the present disclosure.
[0174] In some implementations, the UE 104 and / or the base station 102 may determine a time domain offset for a starting time domain position of PUSCH to apply the OCC sequence.
[0175] In some implementations, the time domain offset may be with respect to a first slot of the PUSCH or a time slot of the PDCCH. In some implementations, the time domain offset may be determined based on a received configuration.
[0176] In some implementations, the UE 104 and / or the base station 102 may determine the time domain offset based on predefined rules, e.g. based on a slot index of the PUSCH. For example, the OCC sequence may be determined to start from an odd or an even slot index.
[0177] In some implementations, a PUSCH with OCC may have a higher priority than a RS or a different physical channel in case of overlapping between the PUSCH and the RS or the different physical channel. In some implementations, different priority value may be associated with a PUSCH with and without OCC. Whether the PUSCH is with or without OCC may be determined based on corresponding OCC indication in higher or physical layer signaling.
[0178] In some implementations, a PUSCH with OCC may overlap with a RS or a different physical channel with a higher priority, the overlapped PUSCH may be dropped or both the overlapped PUSCH and an adjacent PUSCH with same OCC sequence may be dropped. In some implementations, All PUSCH or part of PUSCH corresponding to one OCC sequence may be dropped. For example, if the overlapping happens at a first slot, PUSCH transmission in both the first slot and a second slot may be dropped. If the overlapping happens at the second slot, only PUSCH in the second slot may be dropped. In this way, interference for other UE may be reduced.
[0179] In some implementations, the UE 104 may determine a DMRS port index for the PUSCH with OCC based on the OCC sequence index. In some implementations, the DMRS port index may be same as the OCC sequence index. In some other implementations, a relationship between the DMRS port index and the OCC sequence index may be configured (e.g. by a higher layer signaling) or predefined. The UE 104 may determine a DMRS port index for the PUSCH with OCC based on the OCC sequence index and the relationship.
[0180] In some implementations, the UE 104 and / or the base station 102 may be operated in a non-terrestrial network.
[0181] Fig. 7 illustrates an example of a device 700 for PDCCH repetition in accordance with aspects of the present disclosure. The device 700 may be an example of a network entity 102 or a UE 104 as described herein. The device 700 may support wireless communication with one or more network entities 102, UEs 104, or any combination thereof. The device 700 may include components for bi-directional communications including components for transmitting and receiving communications, such as a processor 702, a memory 704, a transceiver 706, and, optionally, an I / O controller 708. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
[0182] The processor 702, the memory 704, the transceiver 706, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. For example, the processor 702, the memory 704, the transceiver 706, or various combinations or components thereof may support a method for performing one or more of the operations described herein.
[0183] In some implementations, the processor 702, the memory 704, the transceiver 706, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure. In some implementations, the processor 702 and the memory 704 coupled with the processor 702 may be configured to perform one or more of the functions described herein (e.g., executing, by the processor 702, instructions stored in the memory 704) .
[0184] For example, the processor 702 may support wireless communication at the device 700 in accordance with examples as disclosed herein. The processor 702 may be configured to operable to support a means for performing the following: determining, a number of physical downlink control channel (PDCCH) repetitions, wherein the number of the PDCCH repetitions is predefined or based on a first received signaling; determining, at least one time resource for the PDCCH repetitions, wherein the at least one time resource for the PDCCH repetitions are at different slots or different symbols; determining, a time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; and receiving, from a base station, PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0185] Alternatively, in some implementations, the processor 702 may be configured to operable to support a means for performing the following: determining, a number of physical downlink control channel (PDCCH) repetitions; determining, at least one time resource for the PDCCH repetitions, wherein the time resources for the PDCCH repetitions are at different slots or different symbols; determining, a time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; and transmitting, to a user equipment (UE) , PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0186] The processor 702 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some implementations, the processor 702 may be configured to operate a memory array using a memory controller. In some other implementations, a memory controller may be integrated into the processor 702. The processor 702 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 704) to cause the device 700 to perform various functions of the present disclosure.
[0187] The memory 704 may include random access memory (RAM) and read-only memory (ROM) . The memory 704 may store computer-readable, computer-executable code including instructions that, when executed by the processor 702 cause the device 700 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 702 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some implementations, the memory 704 may include, among other things, a basic I / O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
[0188] The I / O controller 708 may manage input and output signals for the device 700. The I / O controller 708 may also manage peripherals not integrated into the device M02. In some implementations, the I / O controller 708 may represent a physical connection or port to an external peripheral. In some implementations, the I / O controller 708 may utilize an operating system such as or another known operating system. In some implementations, the I / O controller 708 may be implemented as part of a processor, such as the processor 706. In some implementations, a user may interact with the device 700 via the I / O controller 708 or via hardware components controlled by the I / O controller 708.
[0189] In some implementations, the device 700 may include a single antenna 710. However, in some other implementations, the device 700 may have more than one antenna 710 (i.e., multiple antennas) , including multiple antenna panels or antenna arrays, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 706 may communicate bi-directionally, via the one or more antennas 710, wired, or wireless links as described herein. For example, the transceiver 706 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 706 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 710 for transmission, and to demodulate packets received from the one or more antennas 710. The transceiver 706 may include one or more transmit chains, one or more receive chains, or a combination thereof.
[0190] A transmit chain may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmit chain may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmit chain may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmit chain may also include one or more antennas 710 for transmitting the amplified signal into the air or wireless medium.
[0191] A receive chain may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receive chain may include one or more antennas 710 for receive the signal over the air or wireless medium. The receive chain may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receive chain may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receive chain may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
[0192] Fig. 8 illustrates an example of a processor 800 for PDCCH repetition in accordance with aspects of the present disclosure. The processor 800 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 800 may include a controller 802 configured to perform various operations in accordance with examples as described herein. The processor 800 may optionally include at least one memory 804, such as L1 / L2 / L3 cache. Additionally, or alternatively, the processor 800 may optionally include one or more arithmetic-logic units (ALUs) 806. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
[0193] The processor 800 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 800) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .
[0194] The controller 802 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 800 to cause the processor 800 to support various operations in accordance with examples as described herein. For example, the controller 802 may operate as a control unit of the processor 800, generating control signals that manage the operation of various components of the processor 800. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
[0195] The controller 802 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 804 and determine subsequent instruction (s) to be executed to cause the processor 800 to support various operations in accordance with examples as described herein. The controller 802 may be configured to track memory address of instructions associated with the memory 804. The controller 802 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 802 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 800 to cause the processor 800 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 802 may be configured to manage flow of data within the processor 800. The controller 802 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 800.
[0196] The memory 804 may include one or more caches (e.g., memory local to or included in the processor 800 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementation, the memory 804 may reside within or on a processor chipset (e.g., local to the processor 800) . In some other implementations, the memory 804 may reside external to the processor chipset (e.g., remote to the processor 800) .
[0197] The memory 804 may store computer-readable, computer-executable code including instructions that, when executed by the processor 800, cause the processor 800 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 802 and / or the processor 800 may be configured to execute computer-readable instructions stored in the memory 804 to cause the processor 800 to perform various functions. For example, the processor 800 and / or the controller 802 may be coupled with or to the memory 804, the processor 800, the controller 802, and the memory 804 may be configured to perform various functions described herein. In some examples, the processor 800 may include multiple processors and the memory 804 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.
[0198] The one or more ALUs 806 may be configured to support various operations in accordance with examples as described herein. In some implementation, the one or more ALUs 806 may reside within or on a processor chipset (e.g., the processor 800) . In some other implementations, the one or more ALUs 806 may reside external to the processor chipset (e.g., the processor 800) . One or more ALUs 806 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 806 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 806 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 806 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 806 to handle conditional operations, comparisons, and bitwise operations.
[0199] The processor 800 may support wireless communication in accordance with examples as disclosed herein. The processor 800 may be configured to operable to support a means for performing the following: determining a number of physical downlink control channel (PDCCH) repetitions, wherein the number of the PDCCH repetitions is predefined or based on a first received signaling; determining at least one time resource for the PDCCH repetitions, wherein the at least one time resource for the PDCCH repetitions are at different slots or different symbols; determining, a time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; and receiving, from a base station, PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0200] Alternatively, in some implementations, the processor 800 may be configured to operable to support a means for performing the following: determining, a number of physical downlink control channel (PDCCH) repetitions; determining, at least one time resource for the PDCCH repetitions, wherein the time resources for the PDCCH repetitions are at different slots or different symbols; determining, a time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; and transmitting, to a user equipment (UE) , PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0201] Fig. 9 illustrates a flowchart of a method 900 for PDCCH repetition in accordance with aspects of the present disclosure. The operations of the method 900 may be implemented by a device or its components as described herein. For example, the operations of the method 900 may be performed by the UE 104 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0202] At 910, the method may include determining, a number of physical downlink control channel (PDCCH) repetitions, wherein the number of the PDCCH repetitions is predefined or based on a first received signalling.
[0203] At 920, the method may include determining, at least one time resource for the PDCCH repetitions, wherein the at least one time resource for the PDCCH repetitions are at different slots or different symbols.
[0204] At 930, the method may include determining, a time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions.
[0205] At 940, the method may include receiving, from a base station, PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0206] Fig. 10 illustrates a flowchart of a method 1000 for PDCCH repetition in accordance with aspects of the present disclosure. The operations of the method 1000 may be implemented by a device or its components as described herein. For example, the operations of the method 1000 may be performed by the base station 102 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0207] At 1010, the method may include determining, a number of physical downlink control channel (PDCCH) repetitions.
[0208] At 1020, the method may include determining, at least one time resource for the PDCCH repetitions, wherein the time resources for the PDCCH repetitions are at different slots or different symbols.
[0209] At 1030, the method may include determining, a time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions.
[0210] At 1040, the method may include transmitting, to a user equipment (UE) , PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.
[0211] Fig. 11 illustrates a flowchart of a method 1100 for PDCCH repetition in accordance with aspects of the present disclosure. The operations of the method 1100 may be implemented by a device or its components as described herein. For example, the operations of the method 1100 may be performed by the UE 104 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0212] At 1110, the method may include receiving, from a base station, a signaling related to repetition in initial access procedure.
[0213] At 1120, the method may include determining, based on the signaling, a number of message 4 (msg4) physical downlink shared channel (PDSCH) repetitions.
[0214] Fig. 12 illustrates a flowchart of a method 1200 for PDCCH repetition in accordance with aspects of the present disclosure. The operations of the method 1200 may be implemented by a device or its components as described herein. For example, the operations of the method 1200 may be performed by the base station 102 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0215] At 1210, the method may include determining a number of message 4 (msg4) physical downlink shared channel (PDSCH) repetitions.
[0216] At 1220, the method may include transmitting, to a UE, a signaling related to repetition in initial access procedure.
[0217] Fig. 13 illustrates a flowchart of a method 1300 for PDCCH repetition in accordance with aspects of the present disclosure. The operations of the method 1300 may be implemented by a device or its components as described herein. For example, the operations of the method 1300 may be performed by the UE 104 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0218] At 1310, the method may include receiving, from a base station, a signaling indicating an orthogonal cover code (OCC) sequence index in a PDCCH to be used for a PUSCH transmission.
[0219] At 1320, the method may include performing the PUSCH transmission based on the OCC sequence index.
[0220] Fig. 14 illustrates a flowchart of a method 1400 for PDCCH repetition in accordance with aspects of the present disclosure. The operations of the method 1400 may be implemented by a device or its components as described herein. For example, the operations of the method 1400 may be performed by the base station 102 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0221] At 1410, the method may include transmitting, to a UE, a signaling indicating an orthogonal cover code (OCC) sequence index in a PDCCH to be used for a PUSCH transmission.
[0222] At 1420, the method may include receiving, from the UE, the PUSCH transmission based on the OCC sequence index.
[0223] It shall be noted that implementations of the present disclosure which have been described with reference to Figs. 1 to 6 are also applicable to the device 700, the processor 800 as well as the methods 900 to 1400.
[0224] It should be noted that the methods described herein describe possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined.
[0225] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
[0226] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
[0227] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
[0228] As used herein, including in the claims, an article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” or “one or both of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. Further, as used herein, including in the claims, a “set” may include one or more elements.
[0229] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A user equipment (UE) , comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:determine a number of physical downlink control channel (PDCCH) repetitions, wherein the number of the PDCCH repetitions is predefined or based on a first received signaling;determine at least one time resource for the PDCCH repetitions, wherein the at least one time resource for the PDCCH repetitions are at different slots or different symbols;determine a time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; andreceive, from a base station via the transceiver, the PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.2.The UE of claim 1, wherein the processor is configured to receive the PDCCH repetitions from a common search space (CSS) .3.The UE of claim 1, wherein the first received signaling comprises one of the following that indicates the number of the PDCCH repetitions:a master information block (MIB) ,a system information block 1 (SIB1) , ora radio resource control (RRC) .4.The UE of claim 1, wherein the first received signaling comprises a bit that indicates the number of the PDCCH repetitions, wherein the bit is one of the following:a dedicated bit for indicating the number of the PDCCH repetitions,a reserved bit, ora bit re-interpreted for indicating the number of the PDCCH repetitions.5.The UE of claim 1, wherein the processor is configured to determine the at least one time resource based on one of the following:at least one time domain offset with respect to an existing PDCCH monitoring occasion or a previous PDCCH monitoring occasion, wherein the at least one time domain offset is configured or predefined,a control resource set (CORESET) lengthan additional search space or additional sub-search space configuration, ora bitmap for determining PDCCH monitoring occasion.6.The UE of claim 5, wherein the at least one time domain offset is a slot level time domain offset or a symbol level time domain offset.7.The UE of claim 1, wherein the processor is configured to determine the time domain starting position based on at least one of the following:at least one symbol index or slot index which is configured or predefined,a PDCCH monitoring occasion,a PDCCH monitoring periodicity,a PDCCH monitoring offset,the number of the PDCCH repetitions, ora received configuration.8.The UE of claim 1, wherein in case that a time resource for a PDCCH repetition overlaps with a synchronization signal block (SSB) , the PDCCH is discarded, or the overlapped PDCCH symbol is discarded, or the overlapped PDCCH symbol is postponed.9.The UE of claim 1, wherein the PDCCH repetitions apply a same spatial domain filter.10.The UE of claim 1, wherein the processor is further configured to:receive, from the base station via the transceiver, a signaling related to repetition in initial access procedure; anddetermine, based on the signaling, a number of message 4 (msg4) physical downlink shared channel (PDSCH) repetitions which are scheduled by the PDCCH.11.The UE of claim 10, wherein the PDCCH comprises a bit for indicating the number of msg4 PDSCH repetitions, wherein the bit is one of the following:a dedicated bit for indicating the number of msg4 PDSCH repetitions,a bit re-interpreted for indicating the number of msg4 PDSCH repetitions.12.The UE of claim 11, wherein the bit re-interpreted for indicating the number of msg4 PDSCH repetitions comprises one of the following:a transmission power control (TPC) command,a time domain resource assignment (TDRA) ,a hybrid automatic repeat request (HARQ) process identifier, ora downlink assignment index (DAI) .13.The UE of claim 1, wherein the processor is further configured to:receive, from the base station via the transceiver, a signaling indicating an orthogonal cover code (OCC) sequence index in the PDCCH to be used for a PUSCH transmission.perform the PUSCH transmission based on the OCC sequence index.14.The UE of claim 13, wherein the signaling comprises a bit in a DCI that indicate the OCC sequence index.15.The UE of claim 14, wherein the bit in the DCI reuses a bit for a HARQ process identifier, a demodulation reference signal (DMRS) port index, or a DMRS code-division multiplexing (CDM) group index.16.The UE of claim 13, wherein the processor is further configured to:determine a time domain offset for a starting time domain position of PUSCH to apply the OCC sequence.17.The UE of claim 13, wherein a PUSCH with OCC overlaps with a RS or a different physical channel with a higher priority, the overlapped PUSCH is dropped or both the overlapped PUSCH and an adjacent PUSCH with same OCC sequence are dropped.18.The UE of claim 13, wherein the processor is further configured to:determine a DMRS port index for the PUSCH with OCC based on the OCC sequence index.19.A base station, comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:determine a number of physical downlink control channel (PDCCH) repetitions;determine at least one time resource for the PDCCH repetitions, wherein the time resources for the PDCCH repetitions are at different slots or different symbols;determine a time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; andtransmit, to a user equipment (UE) via the transceiver, the PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.20.A method performed by a user equipment (UE) , the method comprising:determining a number of physical downlink control channel (PDCCH) repetitions, wherein the number of the PDCCH repetitions is predefined or based on a first received signaling;determining at least one time resource for the PDCCH repetitions, wherein the time resources for the PDCCH repetitions are at different slots or different symbols;determining time domain starting position of the PDCCH repetitions based on the at least one time resource for the PDCCH repetitions; andreceiving, from a base station, PDCCH repetitions based on the number of the PDCCH repetitions and the at least one time resource.