Contention resolution of contention based random access
The method improves contention resolution for battery-less IoT devices by transmitting a first message with a random identity and using non-consecutive trigger messages for resource scheduling, addressing the challenges of resource allocation and identity matching in wireless communication systems.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-05-08
- Publication Date
- 2026-03-19
Smart Images

Figure CN2025093459_19032026_PF_FP_ABST
Abstract
Description
CONTENTION RESOLUTION OF CONTENTION BASED RANDOM ACCESSTECHNICAL FIELD
[0001] The present disclosure relates to wireless communications, and more specifically to contention resolution of contention based random access, for example, contention resolution of contention based random access for an ambient Internet of Things (A-IoT) device.BACKGROUND
[0002] A wireless communications system may include one or multiple network communication devices, such as base stations (BSs) , 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 user equipment (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) ) .
[0003] In recent years, Internet of things (IoT) has attracted much attention in the wireless communication world. More “things” are expected to be interconnected for improving productivity efficiency and increasing comforts of life. Most of existing wireless IoT devices are powered by battery that need to be replaced or recharged manually. The automation and digitalization of various industries open numbers of new markets requiring new IoT technologies of supporting battery-less devices with no energy storage capability or devices with energy storage that do not need to be replaced or recharged manually.SUMMARY
[0004] The present disclosure relates to methods, apparatuses, and systems that support contention resolution of contention based random access, for example, contention resolution of contention based random access for an ambient Internet of Things (A-IoT) device.
[0005] Some implementations of the method and devices described herein include, transmitting, to a second device, a first message after the first device determines to initiate a contention based random access procedure, in which the first message comprises a first random identity (ID) ; and determining whether at least one second random ID in at least one second message matches the first random ID, wherein the at least one second message is part of a set of second messages from the second device after transmission of the first message.
[0006] In some implementations of the method and devices described herein, the at least one second message is received prior to first transmission from the second device to the first device, in which the first transmission is subsequent to second transmission scheduling a resource for transmitting the first message.
[0007] In some implementations of the method and devices described herein, the first transmission comprises one of the following: a first trigger message; a set of trigger messages; a paging message; or a command message.
[0008] In some implementations of the method and devices described herein, a second trigger message in the second transmission for scheduling the resource for transmitting the first message and the first trigger message are non-consecutive trigger messages.
[0009] In some implementations of the method and devices described herein, the at least one second message is associated with a second trigger message scheduling a resource for transmitting the first message.
[0010] In some implementations of the method and devices described herein, the at least one second message associated with the second trigger message comprises a first number of second messages received subsequent to the first message.
[0011] In some implementations of the method and devices described herein, the first number is associated with at least one of the following: a number of resources scheduled by the second trigger message; a response type of a second message; a number of consecutive trigger messages; a number of resources for transmitting first messages; or an indicated value in message transmission from the second device to the first device.
[0012] In some implementations of the method and devices described herein, the message transmission comprises: a paging message; a second message; or a trigger message; or any combination thereof.
[0013] Some implementations of the method and devices described herein include, based on the response type indicating that a second message corresponds to a first message resource, determining that the first number is equal to: a second number of resources scheduled by the second trigger message, or a product of the second number and the number of the consecutive trigger messages; or based on the response type indicating that a second message corresponds to one or more first message resources in a time domain resource, determining that the first number is equal to: a third number of time domain resources scheduled by the second trigger message, or a product of the third number and the number of the consecutive trigger messages; or based on the response type indicating that a second message corresponds to first message resources in a plurality of time domain resources, determining that the first number is equal to 1 or the number of the consecutive trigger messages.
[0014] In some implementations of the method and devices described herein, the at least one second message associated with the second trigger message comprises a first flag value, in which the first flag value is matched with a second flag value in the second trigger message.
[0015] In some implementations of the method and devices described herein, the at least one second message comprises a second message associated with a resource for transmitting the first message.
[0016] Some implementations of the method and devices described herein include, determining that the second message is associated with the resource based on: a resource index comprised in the second message; or the resource index and a trigger message index comprised in the second message.
[0017] In some implementations of the method and devices described herein, the resource index comprises one of the following: a resource order of the resource; a time domain index associated with the resource; or a frequency domain index associated with the resource.
[0018] Some implementations of the method and devices described herein include, receiving, from the second device, a response type of a second message; a trigger message index of a second trigger message scheduling a resource for transmitting the first message; a resource index of the resource for transmitting the first message; or any combination thereof.
[0019] Some implementations of the method and devices described herein include, receiving, from a first device, a first message associated with initiating a contention based random access procedure, in which the first message comprises a first random identity (ID) ; and transmitting a set of second messages after reception of the first message, in which the set of second messages comprises information for the first device to determine whether at least one second random ID in at least one second message matches the first random ID. The at least one second message is part of the set of second messages.
[0020] In some implementations of the method and devices described herein, the information comprises a flag value associated with a trigger message; a resource index indicating one of at least one resource for transmitting at least one first message; or a trigger message index of a trigger message; or any combination thereof.
[0021] In some implementations of the method and devices described herein, the resource index comprises one of the following: a resource order of a resource; a time domain index associated with a resource; or a frequency domain index associated with the resource.
[0022] Some implementations of the method and devices described herein include, transmitting a response type of a second message indicating one of the following: the second message corresponding to a first message resource; the second message corresponding to one or more first message resources in a time domain resource; or the second message corresponding to first message resources in a plurality of time domain resources.BRIEF DESCRIPTION OF THE DRAWINGS
[0023] FIG. 1A illustrates an example of a wireless communications system that supports contention resolution of contention based random access, such as contention resolution of contention based random access for an A-IoT device, in accordance with aspects of the present disclosure.
[0024] FIGS. 1B to 1D illustrate some example cases of Msg2 response (s) to Msg1 resource (s) .
[0025] FIGS. 1E to 1G illustrate some examples of R2D trigger message transmission with Msg2 response (s) .
[0026] FIG. 2 illustrates an example signaling diagram illustrating an example process that supports contention resolution of contention based random access, such as contention resolution of contention based random access for an ambient Internet of Things (A-IoT) device, in accordance with aspects of the present disclosure.
[0027] FIG. 3 illustrates an example of Msg1 transmission in accordance with aspects of the present disclosure.
[0028] FIGS. 4 to 8 illustrate some examples of Msg2 reception and random ID check in accordance with aspects of the present disclosure.
[0029] FIG. 9 illustrates an example of a device that support contention resolution of contention based random access, such as contention resolution of contention based random access for an A-IoT device, in accordance with aspects of the present disclosure.
[0030] FIG. 10 illustrates an example of a processor that support contention resolution of contention based random access, such as contention resolution of contention based random access for an A-IoT device, in accordance with aspects of the present disclosure.
[0031] FIG. 11 illustrates a flowchart of a method that supports contention resolution of contention based random access, such as contention resolution of contention based random access for an A-IoT device, in accordance with aspects of the present disclosure.
[0032] FIG. 12 illustrates a flowchart of a method that supports contention resolution of contention based random access, such as contention resolution of contention based random access for an A-IoT device, in accordance with aspects of the present disclosure.DETAILED DESCRIPTION
[0033] Principles of the present disclosure will now be described with reference to some embodiments. It is to be understood that these embodiments are described 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 below.
[0034] 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.
[0035] 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.
[0036] 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 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.
[0037] The terminology used herein is for the purpose of describing particular embodiments 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.
[0038] As used herein, the term “communication network” refers to a network following any suitable communication standards, such as, 5G new radio (NR) , Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) , and so on. Further, the communications between a user equipment and a network device in the communication network may be performed according to any suitable generation communication protocols, including but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, and / or any other protocols either currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will also be future type communication technologies and systems in which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned systems.
[0039] As used herein, the term “network device” generally refers to a node in a communication network via which a user equipment can access the communication network and receive services therefrom. The network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , a radio access network (RAN) node, an evolved NodeB (eNodeB or eNB) , a NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , an infrastructure device for a V2X (vehicle-to-everything) communication, a transmission and reception point (TRP) , a reception point (RP) , a remote radio head (RRH) , a relay, an integrated access and backhaul (IAB) node, a low power node such as a femto a base station (BS) , a pico BS, and so forth, depending on the applied terminology and technology. The network device may further refer to a network function (NF) in the core network, for example, a SMF, an AMF, a PCF, a UPF or devices with same function in future network architectures, and so forth.
[0040] As used herein, the term “user equipment (UE) ” generally refers to any end device that may be capable of wireless communications. By way of example rather than a limitation, a user equipment may also be referred to as a communication device, a terminal device, an end user device, a subscriber station (SS) , an unmanned aerial vehicle (UAV) , a portable subscriber station, a mobile station (MS) , or an access terminal (AT) . The user equipment may include, but is not limited to, a mobile phone, a cellular phone, a smart phone, a voice over IP (VoIP) phone, a wireless local loop phone, a tablet, a wearable user equipment, a personal digital assistant (PDA) , a portable computer, a desktop computer, an image capture user equipment such as a digital camera, a gaming user equipment, a music storage and playback appliance, a vehicle-mounted wireless user equipment, a wireless endpoint, a mobile station, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , a USB dongle, a smart device, wireless customer-premises equipment (CPE) , an Internet of Things (IoT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device (for example, a remote surgery device) , an industrial device (for example, a robot and / or other wireless devices operating in an industrial and / or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and / or industrial wireless networks, and the like.
[0041] It is approved for continuous study for a kind of wireless IoT device, which called Ambient IoT (AIoT, or A-IoT) device. One of objectives is to design the compact protocol stack and corresponding procedures e.g. paging, random access, data transmission etc. It was agreed that A-IoT Msg2 contains one or multiple Echoed Random ID (s) from A-IoT Msg1 of different A-IoT devices, i.e. one Msg2 can multiplex multiple Msg1 responses. On the other hand, a new R2D message (so called R2D trigger message) other than the paging message is introduced for A-IoT device determining MSG1 resources. It was also agreed for Msg1 transmission determined by one R2D transmission triggering random access, support X=1 and X=2 time domain resource (s) for D2R transmission (s) for Msg1 only. That is to say, in a time domain, one R2D trigger message can schedule 1 or 2 time domain Msg1 resources.
[0042] FIG. 1A illustrates an example of a wireless communications system (or referred to as communication network or comprises a communication network) 100 that supports contention resolution of contention based random access, such as contention resolution of contention based random access for an AIoT device in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more network entities 102 (also referred to as network equipment) , one or more 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.
[0043] The one or more 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, a network element, a radio access network (RAN) , 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 signalling, transmit signalling) over a communication interface.
[0044] 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.
[0045] 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.
[0046] 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. 1A. 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. 1A. 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.
[0047] 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 communication interface.
[0048] 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, N2, 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) .
[0049] 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.
[0050] 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) ) .
[0051] 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 signalling (e.g., 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, MAC layer) functionality and signalling, and may each be at least partially controlled by the CU.
[0052] 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) .
[0053] 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.
[0054] 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.
[0055] 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) .
[0056] 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.
[0057] 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.
[0058] 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.
[0059] 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.
[0060] 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 (410 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.
[0061] 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.
[0062] FIG. 1B illustrates an example case of an Msg2 response to one Msg1 resource. In such case, a response may be referred to as separate response, i.e. so called separate Msg2. As shown in FIG. 1B, each Msg2 responds to one Msg1 resource, corresponding to one Msg1 resource that scheduled by one R2D trigger message.
[0063] FIG. 1C illustrates an example case of an Msg2 response to one or multiple Msg1 resource (s) . In such case, a response may be referred to as partial response, so called partial Msg2. As shown in FIG. 1C, each Msg2 responds to one or multiple Msg1 resource (s) for one time domain resource, corresponding to Msg1 resources that scheduled by one R2D trigger message.
[0064] FIG. 1D illustrates an example case of an Msg2 response to a plurality of Msg1 resources. In such case, a response may be referred to as common response, so called common Msg2. As an example, the plurality of Msg1 resources may be all the Msg1 resources. As shown in FIG. 1D, each Msg2 responds to all Msg1 resource (s) for all time domain resource (s) , corresponding to all Msg1 resources that scheduled by one R2D trigger message.
[0065] In some examples, it is also possible that subsequent R2D trigger messages are interleaved transmitted with Msg2 response (s) corresponding to previous R2D trigger message. The subsequent R2D trigger messages being interleaved transmitted with Msg2 response (s) may be referred to as interleaved R2D trigger message transmission with Msg2 (such as separate Msg2, or partial Msg2, or common Msg2) . The interleaved transmission may be understood that, between an R2D trigger message and its corresponding Msg2 response (s) , there may be another R2D trigger message transmitted.
[0066] For example, as shown in FIG. 1E, which shows an example case for interleaved R2D trigger message transmission with separate Msg2, the second R2D trigger message of the two R2D trigger messages is transmitted between the first R2D trigger message of the two R2D trigger messages and three Msg2 responses corresponding to the first R2D trigger message. The first R2D trigger message is transmitted first, and the second R2D trigger message is transmitted subsequent to the first R2D trigger message in this example.
[0067] As shown in FIG. 1F, which shows an example case for interleaved R2D trigger message transmission with partial Msg2, the second R2D trigger message is transmitted between the first R2D trigger message and two Msg2 responses corresponding to the first R2D trigger message.
[0068] As shown in FIG. 1G, which shows an example case for interleaved R2D trigger message transmission with common Msg2, the second R2D trigger message is transmitted between the first R2D trigger message and an Msg2 response corresponding to the first R2D trigger message.
[0069] It should be noted that the example cases for interleaved R2D trigger message transmission with separate Msg2, or partial Msg2 or common Msg2 are not limited to the examples shown above.
[0070] In view of the above analysis and discussions, unified solution to cover all cases above need to be designed, for example, a solution related to how A-IoT device behavior is designed to receive Msg2 and determine contention resolution results. In an aspect of the solution, a first device transmits, to a second device, a first message after the first device determines to initiate a contention based random access procedure, in which the first message comprises a first random identity (ID) . The first device determines whether at least one second random ID in at least one second message matches the first random ID, wherein the at least one second message is part of a set of second messages from the second device after transmission of the first message. Aspects of the solution enable some issues as mentioned above be resolved. Principles and implementations of embodiments of the present disclosure will be described in detail below with reference to FIGS. 2-12.
[0071] Some terms may be involved in some examples of the present disclosure will be described first. (1) Access occasion, also refers to Msg1 resource, is a time-frequency resource for device (s) to transmit Msg1 (i.e., the Random ID message) during a CBRA (contention based random access) procedure. Access occasion may also refer to an opportunity of time-frequency resource for A-IoT device (s) to perform access (e.g., transmitting the A-IoT Msg1 by the device) . A set of access occasion (s) for different A-IoT device (s) is scheduled via the R2D message (referring to the “R2D transmission triggering random access” ) by the reader. (2) AS (access stratum) ID (identity) is an AS layer identifier to address the specific device for R2D (reader to device) reception and D2R (device to reader) scheduling. (3) A-IoT device is a device that supports A-IoT radio interface towards a gNB-reader. (4) A-IoT Msg1, also refers to Random ID message, is a first D2R message transmission in an A-IoT CBRA procedure. (5) A-IoT Msg2, also refers to Random ID Response message, is an R2D message in response to an A-IoT Msg1 in the A-IoT CBRA procedure. (6) A-IoT reader is a reader providing A-IoT protocol terminations towards the A-IoT device. (7) Access Occasion Trigger message, also refers to R2D trigger message, is introduced for A-IoT device determining MSG1 resources. E. g. in a time domain, an R2D trigger message can schedule 1 or 2 time domain Msg1 resources. (8) R2D Upper Layer Data Transfer message, also refers to R2D Command, i.e. command message in some examples.
[0072] FIG. 2 illustrates an example signaling diagram illustrating an example process that supports contention resolution of contention based random access, such as contention resolution of contention based random access for an A-IoT device, in accordance with aspects of the present disclosure. A first device 201 and a second device 203 are involved in the process 200. In some examples, an example of the first device 201 may be an A-IoT device. In some examples, an example of the second device 203 may be a reader (or referred to as A-IoT reader in some examples) . In some examples, the A-IoT device is a type of UE, e.g. the UE 104 above. In some examples, the reader may be a BS (e.g. a network entity 102) or a UE (e.g. a UE 104 different from the A-IoT device) .
[0073] In the process 200, the first device 201 may transmit (202) , to the second device 203, a first message 205 after the first device 201 determines to initiate a contention based random access procedure. The first message 205 may comprise a first random identity (ID) . On the second device 203 side, the second device 203 may receive (204) , from the first device 201, the first message 205. The first message 205 is associated with initiating the contention based random access procedure by the first device 201. The second device 203 may transmit (206) a set of second messages 215 after reception of the first message 205. The first message 205 may be Msg1 in some examples. The second message may be Msg2 in some examples. The first device 201 may receive (208) the set of second messages 215.
[0074] The first device 201 may determine (212) whether at least one second random ID in at least one second message matches the first random ID. The at least one second message is part of the set of second messages 215 from the second device 203 after transmission of the first message 205.
[0075] In some examples, the second device 203 may transmit a response type of a second message indicating the second message corresponding to a first message resource (e.g. Msg1 resource) , or indicating the second message corresponding to one or more first message resources in a time domain resource, or indicating the second message corresponding to first message resources in a plurality of time domain resources. The first device 201 may receive, from the second device 203, the response type of the second message (e.g. Msg2 response type) . Additionally or alternatively, the second device 203 may transmit a resource index indicating one of at least one resource for transmitting at least one first message. The first message 205 may be one of the at least one first message. Additionally or alternatively, the second device 203 may transmit a trigger message index of a trigger message. On the first device 201 side, the first device 201 may receive, from the second device 203, the trigger message index, e.g. the trigger message index of a second trigger message scheduling a resource (e.g. the Msg1 resource) for transmitting the first message 205. The resource for transmitting the first message 205 may be the Msg1 resource for transmitting the Msg1. Additionally or alternatively, the first device 201 may receive the resource index e.g. the resource index of the resource for transmitting the first message 205.
[0076] In some examples, the resource index, or the trigger message index, or any combination thereof may be comprised in a second messages among the set of second messages 215. In some examples, the set of second messages 215 may comprise information for the first device 201 to determine (e.g. check) whether at least one second random ID in at least one second message matches the first random ID. In some examples, the information comprised in the set of second messages 215 may comprise a flag value associated with a trigger message, a resource index indicating one of at least one resource for transmitting at least one first message, or a trigger message index of a trigger message, or any combination thereof.
[0077] Then the first device 201 may receive the information for determining whether the at least one second random ID in the at least one second message matches the first random ID, and determine, based on the information, whether the at least one second random ID in the at least one second message matches the first random ID. The details of such examples may further refer to Embodiment 2-2 or Embodiment 3 hereinafter. In some other examples, the first device 201 may determine whether at least one second random ID in at least one second message matches the first random ID in other ways. The details of such examples may further refer to Embodiment 1 or Embodiment 2-1 hereinafter.
[0078] In some examples, the at least one second message is received prior to first transmission from the second device 203 to the first device 201. The first transmission is subsequent to second transmission. The second transmission is for scheduling a resource for transmitting the first message 205. For example, the second transmission comprises a second trigger message for scheduling the resource for transmitting the first message. The first device 201 may determine whether the at least one second random ID in the at least one second message matches the first random ID, prior to receiving the first transmission from the second device 203 to the first device 201. In other words, the first device 201 determines whether the at least one second random ID in the at least one second message matches the first random ID, when the first device 201 does not receive the first transmission above.
[0079] In some examples, the first transmission from the second device 203 (e.g. the reader) to the first device 201 (e.g. the A-IoT device) may be R2D transmission. The second transmission may be also referred to as R2D transmission in some examples. As mentioned above, the first transmission is subsequent to second transmission, as such, the first transmission may also referred to as subsequent R2D transmission. In some examples, the first device 201 determining whether the at least one second random ID in the at least one second message matches the first random ID, may be implemented to be the A-IoT device checking random ID in the Msg2 before the subsequent R2D transmission. For example, after the A-IoT device transmits the Msg1, and receives the Msg2 with random ID response, the A-IoT device determines whether there is a matched random ID in the received Msg2 as in the transmitted Msg1, when the A-IoT device does not receive the subsequent R2D transmission in this paging round.
[0080] In some examples, the first transmission comprises a first trigger message. For example, the subsequent R2D transmission may be an R2D trigger message. Alternatively, the first transmission comprises a set of trigger messages. For example, for the interleaved R2D trigger message transmission mentioned above, the subsequent R2D transmission may be subsequent set of R2D trigger messages. Alternatively, the first transmission comprises a paging message. For example, the subsequent R2D transmission may be a paging message. Alternatively, the first transmission comprises a command message. For example, the subsequent R2D transmission may be a command message. In some examples, the second trigger message and the first trigger message may be non-consecutive trigger messages. Two consecutive trigger messages being the non-consecutive trigger messages means that no other messages (besides Msg1) are transmitted between the two consecutive trigger messages. For example, the subsequent R2D transmission may be a subsequent non-consecutive R2D trigger message subsequent to a previous R2D trigger message.
[0081] The details of the examples above will be described in Embodiment 1 below. Prior to describing the Embodiment 1, Msg1 transmission may be described first. As shown in FIG. 3, which illustrates an example of Msg1 transmission in accordance with aspects of the present disclosure. The A-IoT reader sends an A-IoT paging message (an example of the paging message) , which contains an Msg1 resource number, and Msg1 resource allocation information. In this paging round, i.e. before the next paging message, there followed multiple R2D trigger messages, which indicate start time of Msg1 resource in a time domain. It is possible that there are 1 or 2 time domain resources and multiple frequency domain resources. If the A-IoT device determines to respond the paging message, the A-IoT device randomly selects one Msg1 resource from all Msg1 resources for Msg1 transmission. And by receiving an R2D trigger message, the A-IoT device will count Msg1 resources and determine whether to send the Msg1 on one of Msg1 resources that triggered by the R2D trigger message.
[0082] In an example of the Embodiment 1, with reference to FIG. 3 above, there are totally 9 Msg1 resources, and the A-IoT device select the fifth resource (i.e. the Msg1 resource 302) for transmission among the 9 Msg1 resources. The A-IoT device receives an R2D trigger message and counts Msg1 resources, and then determines to transmit the Msg1 on the second Msg1 resource (i.e. the Msg1 resource 302) that triggered by the second R2D trigger message (i.e. the R2D trigger message 301) , which is the fifth resource among all Msg1 resources.
[0083] After A-IoT device transmits the Msg1, and receives Msg2 (s) with a random ID response (i.e. random ID as a response) , the A-IoT device determines whether there is matched random ID as in Msg1 transmission (i.e. a random ID in the Msg2 is the same as a random ID in the Msg1) , when the A-IoT device does not receive subsequent R2D transmission (e.g. the R2D trigger message 303) in this paging round. That is, once the random ID message (e.g. the Msg1) is transmitted, and if a random ID response message (e.g. the Msg2) is received, the A-IoT MAC entity shall check whether the value indicated in Echoed Random ID field in a Random ID Response message is identical to the value of the Random ID field in the transmitted Random ID message, when the A-IoT device does not receive subsequent R2D transmission in this paging round, or on the other word, before the A-IoT device receives subsequent R2D transmission in this paging round.
[0084] An example of the Embodiment 1 may refer to FIG. 4, which illustrates an example of Msg2 reception and random ID check in accordance with aspects of the present disclosure. As shown in FIG. 4, For the Msg2s received prior to the subsequent R2D transmission (e.g. the R2D trigger message 303) , the A-IoT device checks whether there is matched random ID as in Msg1 transmission. For the Msg2s received after the R2D trigger message 303, the A-IoT device will not perform the check above.
[0085] FIG. 4 takes separate Msg2 transmission as an example, and R2D transmission is an R2D trigger message. It should be understood that the same principle may be also applicable to partial Msg2 in FIG. 1C or common Msg2 transmission in FIG. 1D. And the same principle may be also applicable when R2D transmission is a paging message or a command message.
[0086] In another example of the Embodiment 1, for interleaved R2D trigger message transmission, the principle could be extended and the A-IoT device determines whether there is a matched random ID as in Msg1 transmission, when the A-IoT device does not receive subsequent set of R2D trigger messages or a subsequent non-consecutive R2D trigger message in this paging round. That is to say, once the random ID message (e.g. the Msg1) is transmitted, and if a random ID response message (e.g. the Msg2) is received, the A-IoT MAC entity shall check whether the value indicated in Echoed Random ID field in Random ID Response message is identical to the value of the Random ID field in the transmitted Random ID message, when the A-IoT device does not receive subsequent set of R2D trigger message in this paging round, or on the other word, before the A-IoT device receive a subsequent non-consecutive R2D trigger message in this paging round. Such example may refer to FIG. 5, which illustrates another example of Msg2 reception and random ID check in accordance with aspects of the present disclosure. As shown in FIG. 5, for the Msg2s received prior to the set of R2D trigger messages (e.g. the R2D trigger messages 501 and 502) , the A-IoT device checks whether there is matched random ID as in Msg1 transmission. For the Msg2s received after the set of R2D trigger messages (the R2D trigger messages 501 and 502) , the A-IoT device will not perform the check above.
[0087] Continuing with reference to Fig. 2, in some examples, the at least one second message is associated with a second trigger message scheduling a resource for transmitting the first message 205. In such examples, the first device 201 may determine (e.g. check) whether the at least one second random ID in the at least one second message matches the first random ID, if the at least one second message is associated with the second trigger message above. For example, the A-IoT device may check random ID in Msg2 (s) that corresponding to the R2D trigger message. The R2D trigger message is for scheduling a resource for transmitting the Msg1.
[0088] In some examples, the at least one second message associated with the second trigger message comprises a first number (may represented as N) of second messages received subsequent to the first message 205. In other words, if the at least one second message above comprises the first number of second messages received subsequent to the first message 205, then the at least one second message may be considered to be associated with the second trigger message. For example, the A-IoT device determines corresponding Msg2 (s) based on a counter. After Msg1 transmission, the A-IoT device receives Msg2 (s) . Then the A-IoT device determines whether there is matched random ID in the received Msg2 with random ID in the transmitted Msg1, for the followed N Msg2 (s) after the Msg1 transmission in this paging round.
[0089] In some examples, the first number may be associated with a number of resources scheduled by the second trigger message, a response type of a second message, a number of consecutive trigger messages, a number of resources for transmitting first messages, or an indicated value in message transmission from the second device 203 to the first device 201, or any combination thereof. In some examples, the message transmission above comprises a paging message, a second message, or a trigger message, or any combination thereof. For example, a value of the N may be determined based on Msg1 resource (s) number that triggered by corresponding R2D trigger message. In some examples, the value of the N may be determined based on Msg2 response type, e.g., separate type (refer to FIG. 1B) , partial type (refer to FIG. 1C) , or common type (refer to FIG. 1D) , which is indicated in a paging message / R2D trigger message / Msg2 message. In some examples, the value of the N may be determined based on all Msg1 resource number in this paging round. In some examples, the value of the N may be indicated by the reader in an R2D message e.g. a paging message, an Msg2, or an R2D trigger message etc.
[0090] In some examples, based on the response type (e.g. the Msg2 response type above) indicating that a second message corresponds to a first message resource, the first device 201 may determine that the first number is equal to a second number of resources scheduled by the second trigger message. Alternatively, e.g. for interleaved R2D trigger message transmission, the first device 201 may, based on the response type indicating that a second message corresponds to a first message resource, determine that the first number is equal to a product of the second number and the number of the consecutive trigger messages. The response type indicating that a second message corresponds to a first message resource, e.g. the Msg2 response type indicating that an Msg2 corresponds to an Msg1 resource.
[0091] In some examples, based on the response type indicating that a second message corresponds to one or more first message resources in a time domain resource, the first device 201 may determine that the first number is equal to a third number of time domain resources scheduled by the second trigger message. Alternatively, e.g. for interleaved R2D trigger message transmission, the first device 201 may, based on the response type indicating that a second message corresponds to one or more first message resources in a time domain resource, determine that the first number is equal to a product of the third number and the number of the consecutive trigger messages. The response type indicating that a second message corresponds to one or more first message resources in a time domain resource, e.g. the Msg2 response type indicating that an Msg2 corresponds to one or more Msg1 resources in a time domain resource.
[0092] In some examples, based on the response type indicating that a second message corresponds to first message resources in a plurality of time domain resources, the first device 201 may determine that the first number is equal to 1. Alternatively, e.g. for interleaved R2D trigger message transmission, the first device 201 may, based on the response type indicating that a second message corresponds to first message resources in a plurality of time domain resources, determine that the number of the consecutive trigger messages. The response type indicating that a second message corresponds to first message resources in a plurality of time domain resources, e.g. the Msg2 response type indicating that an Msg2 corresponds to Msg1 resources in a plurality of time domain resources.
[0093] The details of the examples above will be described in Embodiment 2-1 below. Msg1 transmission involved in the Embodiment 2-1 may refer to FIG. 3 above, and the details will not be repeated here. In Embodiment 2-1, after the A-IoT device transmits an Msg1, and receives Msg2 (s) with random ID response, the A-IoT device determines (e.g. checks) whether there is a matched random ID with a random ID in the Msg1 transmission, for the Msg2 (s) corresponding to the R2D trigger message after the Msg1 transmission in this paging round. That is, once the random ID message (e.g. the Msg1) is transmitted, and if a Random ID response message (e.g. the Msg2) is received, the A-IoT MAC entity shall check whether the value indicated in Echoed Random ID field in the Random ID response message is identical to the value of the Random ID field in the transmitted random ID message, when the Random ID response message is associated with the R2D trigger message which triggers Msg1 resource that A-IoT device has sent the Msg1.
[0094] An example of the Embodiment 2-1 may refer to FIG. 6, which illustrates an example of Msg2 reception and random ID check in accordance with aspects of the present disclosure. As shown in FIG. 6, the A-IoT device determines that the followed N (e.g. N=3) Msg2 (s) after Msg1 transmission in this paging round is associated with the R2D trigger message (e.g. the R2D trigger message 601) . That is, once the Random ID message (e.g. Msg1) is transmitted, and if a Random ID response message (e.g. Msg2) is received, the A-IoT MAC entity shall check whether the value indicated in Echoed Random ID field in the Random ID response message is identical to the value of the Random ID field in the transmitted Random ID message, when the counter is less than N.
[0095] The details of the A-IoT device behavior may be as below. The A-IoT device determines to send an Msg1, which is the Random ID message, in resources that scheduled by specific R2D trigger message (e.g. the R2D trigger message 301 as shown in FIG. 3 or the R2D trigger message 601 as shown in FIG. 6) . The A-IoT device determines the value of N that corresponding to the R2D trigger message 301, and reset counter=0. The A-IoT device sends the Msg1, which is the Random ID message, contains a specific Random ID as in FIG. 3. The A-IoT device receives Msg2 (s) which is (are) the Random ID Response message (s) that contain (s) Echoed Random ID (s) . If the A-IoT device receives an Msg2 and counter < N, set counter++ (i.e. counter=counter+1) . The A-IoT device checks whether there is a matched Random ID in the received Msg2 matches a random ID in the Msg1 transmission. If the A-IoT device receives an Msg2 in which there is a matched Random ID matches a random ID in the Msg1 transmission, the A-IoT device considers that random access procedure (i.e. A-IoT random access procedure) is successfully completed. Else if the counter ≥ N, the A-IoT device does not check whether there is a matched Random ID in the received Msg2 matches a random ID in the Msg1 transmission. The A-IoT random access procedure is used for the Ambient IoT device (s) to access the network for data transmission. The A-IoT random access procedure is triggered by a reader, including triggering the access for a single A-IoT device, group of A-IoT devices, or all A-IoT devices under the coverage of the reader.
[0096] With reference to FIG. 6, if an Msg2 is received after the Msg1 transmission and the counter < N (e.g. 3) , the A-IoT device will perform the check, otherwise, if the counter < N (e.g. 3) , the A-IoT device will not perform the check. In such examples, the value of the N may be determined based on Msg1 resource (s) number and Msg2 response type (which is indicated in paging / R2D trigger / Msg2 message) . For example, for separate Msg2 transmission, the N is equal to the Msg1 resource number that triggered by the R2D trigger message. For partial Msg2 transmission, the N is equal to the Msg1 resource number in the time domain that triggered by the R2D trigger message, e.g. in an example referring to FIG. 1F, the N is equal to 2 (since there are 2 time domain resources) . For common Msg2 transmission, the N is equal to 1. In some examples, the value of the N may be determined based on All Msg1 resource number in this paging round. In some examples, the value of the N may be indicated by the reader in an R2D message e.g. a paging message, an Msg2, an R2D trigger message etc.
[0097] In some examples, for interleaved R2D trigger message transmission, the N value in above examples need to be further multiplied by the number of consecutive R2D trigger messages. For example, if there are two consecutive R2D trigger message transmission, for separate Msg2 transmission, the N is equal to the Msg1 resource number that triggered by the R2D trigger message further multiplied by 2. For partial Msg2 transmission, the N is equal to the Msg1 resource number in the time domain that triggered by the R2D trigger message further multiplied by 2. For common Msg2 transmission, the N is 1 multiplied by 2, i.e. is equal to 2.
[0098] Continuing with reference to Fig. 2, in some examples, the at least one second message associated with the second trigger message comprises a first flag value. The first flag value matches a second flag value in the second trigger message. In other words, if the at least one second message above comprises the first flag value, then the at least one second message may be considered to be associated with the second trigger message.
[0099] The details of the examples above will be described in Embodiment 2-2 below. An example of the Embodiment 2-2 may refer to FIG. 7, which illustrates an example of Msg2 reception and random ID check in accordance with aspects of the present disclosure. The A-IoT device determines corresponding Msg2 (s) based on flags contained in an R2D trigger message (e.g. the R2D trigger message 701 in FIG. 7) and Msg2 (s) . Specifically, after the Msg1 transmission, the A-IoT device receives Msg2 (s) , the A-IoT device determines whether there is a matched random ID in the received Msg2 matches a random ID in the transmitted Msg1, for the Msg2 (s) that contains the same flag as in the R2D trigger message (e.g. the R2D trigger message 701) . In some examples, this flag may be 1 or 2 bits. For example, if the R2D trigger message (e.g. the R2D trigger message 701) contains a flag 01, the A-IoT device will determine, in the received Msg2 (s) with flag 01, whether there is matched RN16 (a 16-bit random sequence, and may be an example of the random ID) as in the Msg1 transmission.
[0100] As shown in FIG. 7, the A-IoT device determines the followed Msg2 (s) contains same flag value (e.g. flag “01” ) as in the R2D trigger message 701 is associated with the R2D trigger message 701. That is, once the Random ID message (e.g. the Msg1) is transmitted, and if a Random ID Response message (e.g. the Msg2) is received, the A-IoT MAC entity shall check whether the value indicated in Echoed Random ID field in Random ID Response message is identical to the value of the Random ID field in the transmitted Random ID message, when Random ID Response message contains same flag value (e.g. “01” ) as in the R2D trigger message 701 which triggers Msg1 resource 702 that A-IoT device has sent an Msg1.
[0101] Continuing with reference to Fig. 2, in some examples, the at least one second message comprises a second message associated with a resource for transmitting the first message 205. In such examples, the first device 201 may determine (e.g. check) whether a second random ID in a second message matches the first random ID, if the second message is associated with the resource for transmitting the first message 205.
[0102] In some examples, the first device 201 may determine that the second message is associated with the resource based on a resource index comprised in the second message. In some other examples, the first device 201 may determine that the second message is associated with the resource based on the resource index and a trigger message index comprised in the second message. In some examples, the resource index comprises a resource order of the resource, or a time domain index associated with the resource, or a frequency domain index associated with the resource.
[0103] The details of the examples above will be described in Embodiment 3 below. Msg1 transmission involved in the Embodiment 3 may refer to FIG. 3 above, and the details will not be repeated here. In the Embodiment 3, the A-IoT device checks random ID in Msg2 (s) that corresponding to the Msg1 resource on which the A-IoT device sent the Msg1. After the Msg1 transmission, the A-IoT device receives Msg2 (s) , the A-IoT device determines whether there is a matched random ID in received Msg2 as in the transmitted Msg1, for the Msg2 (s) that corresponding to the Msg1 resource on which the device has sent the Msg1. The A-IoT device may determine the Msg2 based on an Msg1 resource index contained in the Msg2, or an R2D trigger message index contained in the Msg2, or the both above.
[0104] An example of the Embodiment 3 may refer to FIG. 8, which illustrates an example of Msg2 reception and random ID check in accordance with aspects of the present disclosure. As shown in FIG. 8, after the A-IoT device transmits Msg1, and receives Msg2 (s) with random ID response (s) , the A-IoT device determines whether there is a matched random ID as in the Msg1 transmission, for the Msg2 (s) corresponding to the Msg1 resource (e.g. the Msg1 resource 801) after the Msg1 transmission in this paging round. That is, once the Random ID message (e.g. the Msg1) is transmitted, and if a Random ID Response message (e.g. the Msg2) is received, the A-IoT MAC entity shall check whether the value indicated in Echoed Random ID field in the Random ID Response message is identical to the value of the Random ID field in the transmitted Random ID message, when the Random ID Response message is associated with the Msg1 resource (e.g. the Msg1 resource 801) that A-IoT device has sent the Msg1. In such example, the Msg2 802 is associated with the Msg1 resource 801, accordingly, the A-IoT device will perform the check if it receives the Msg2 802.
[0105] In some examples, the above association between the Msg2 802 and the Msg1 resource 801 may be Msg1 resource index, i.e. when the Msg2 802 contains the same Msg1 resource index as the Msg1 resource 801 that A-IoT device has sent the Msg1, the A-IoT device determines the Msg2 802 is associated with the Msg1 resource 801. For separate Msg2 transmission, the Msg1 resource index is a resource order among Msg1 resources that triggered by the R2D trigger message. For partial Msg2 transmission, the Msg1 resource index is the time domain index of Msg1 resource. And for common Msg2 transmission, no Msg1 resource index is needed.
[0106] In some examples, for interleaved R2D trigger message transmission case, the R2D trigger message index may be contained in the Msg2, and the above association between Msg2 and Msg1 resource may be based on both the Msg1 resource index and the R2D trigger message index. For example, the Msg2 may comprise an Msg1 resource index and an R2D trigger message index. If both of the Msg1 resource index and the R2D trigger message index comprised in the Msg2 are the same as an Msg1 resource index and an R2D trigger message index corresponding to the Msg1 resource 801 that A-IoT device has sent the Msg1, the A-IoT device will perform the check above when it receives the Msg2.
[0107] FIG. 9 illustrates an example of a device 900 that supports contention resolution of contention based random access, such as contention resolution of contention based random access for an A-IoT device, in accordance with aspects of the present disclosure. The device 900 may be an example of a UE 104 as described herein. The device 900 may support wireless communication with one or more network entities 102, UEs 104, or any combination thereof. The device 900 may include components for bi-directional communications including components for transmitting and receiving communications, such as a processor 902, a memory 904, a transceiver 906, and, optionally, an I / O controller 908. 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) .
[0108] The processor 902, the memory 904, the transceiver 906, 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 902, the memory 904, the transceiver 906, or various combinations or components thereof may support a method for performing one or more of the operations described herein.
[0109] In some implementations, the processor 902, the memory 904, the transceiver 906, 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 902 and the memory 904 coupled with the processor 902 may be configured to perform one or more of the functions described herein (e.g., executing, by the processor 902, instructions stored in the memory 904) .
[0110] For example, the processor 902 may support wireless communication at the device 900 in accordance with examples as disclosed herein. In some examples, the processor 902 may be configured to operable to support a means for transmitting, to a second device, a first message after the first device determines to initiate a contention based random access procedure, in which the first message comprises a first random identity (ID) ; and a means for determining whether at least one second random ID in at least one second message matches the first random ID, wherein the at least one second message is part of a set of second messages from the second device after transmission of the first message. The processor 902 may be configured to operable to support other means for other implementations of method 1100.
[0111] In some other examples, the processor 902 may be configured to operable to support a means for receiving, from a first device, a first message associated with initiating a contention based random access procedure, wherein the first message comprises a first random identity (ID) ; and a means for transmitting a set of second messages after reception of the first message, in which the set of second messages comprises information for the first device to determine whether at least one second random ID in at least one second message matches the first random ID. The at least one second message is part of the set of second messages. The processor 902 may be configured to operable to support other means for other implementations of method 1200.
[0112] The processor 902 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 902 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 902. The processor 902 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 904) to cause the device 900 to perform various functions of the present disclosure.
[0113] The memory 904 may include random access memory (RAM) and read-only memory (ROM) . The memory 904 may store computer-readable, computer-executable code including instructions that, when executed by the processor 902 cause the device 900 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 902 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some implementations, the memory 904 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.
[0114] The I / O controller 908 may manage input and output signals for the device 900. The I / O controller 908 may also manage peripherals not integrated into the device 900. In some implementations, the I / O controller 908 may represent a physical connection or port to an external peripheral. In some implementations, the I / O controller 908 may utilize an operating system such as or another known operating system. In some implementations, the I / O controller 908 may be implemented as part of a processor, such as the processor 902. In some implementations, a user may interact with the device 900 via the I / O controller 908 or via hardware components controlled by the I / O controller 908.
[0115] In some implementations, the device 900 may include a single antenna 910. However, in some other implementations, the device 900 may have more than one antenna 910 (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 906 may communicate bi-directionally, via the one or more antennas 910, wired, or wireless links as described herein. For example, the transceiver 906 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 906 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 910 for transmission, and to demodulate packets received from the one or more antennas 910. The transceiver 906 may include one or more transmit chains, one or more receive chains, or a combination thereof.
[0116] 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 910 for transmitting the amplified signal into the air or wireless medium.
[0117] 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 910 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.
[0118] FIG. 10 illustrates an example of a processor 1000 that supports contention resolution of contention based random access, such as contention resolution of contention based random access for an A-IoT device, in accordance with aspects of the present disclosure. The processor 1000 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 1000 may include a controller 1002 configured to perform various operations in accordance with examples as described herein. The processor 1000 may optionally include at least one memory 1004. Additionally, or alternatively, the processor 1000 may optionally include one or more arithmetic-logic units (ALUs) 1006. 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) .
[0119] The processor 1000 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 1000) 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) .
[0120] The controller 1002 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 1000 to cause the processor 1000 to support various operations in accordance with examples as described herein. For example, the controller 1002 may operate as a control unit of the processor 1000, generating control signals that manage the operation of various components of the processor 1000. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
[0121] The controller 1002 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 1004 and determine subsequent instruction (s) to be executed to cause the processor 1000 to support various operations in accordance with examples as described herein. The controller 1002 may be configured to track memory address of instructions associated with the memory 1004. The controller 1002 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 1002 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 1000 to cause the processor 1000 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 1002 may be configured to manage flow of data within the processor 1000. The controller 1002 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 1000.
[0122] The memory 1004 may include one or more caches (e.g., memory local to or included in the processor 1000 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementation, the memory 1004 may reside within or on a processor chipset (e.g., local to the processor 1000) . In some other implementations, the memory 1004 may reside external to the processor chipset (e.g., remote to the processor 1000) .
[0123] The memory 1004 may store computer-readable, computer-executable code including instructions that, when executed by the processor 1000, cause the processor 1000 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 1002 and / or the processor 1000 may be configured to execute computer-readable instructions stored in the memory 1004 to cause the processor 1000 to perform various functions (e.g., functions or tasks supporting transmit power prioritization) . For example, the processor 1000 and / or the controller 1002 may be coupled with or to the memory 1004, the processor 1000, the controller 1002, and the memory 1004 may be configured to perform various functions described herein. In some examples, the processor 1000 may include multiple processors and the memory 1004 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.
[0124] The one or more ALUs 1006 may be configured to support various operations in accordance with examples as described herein. In some implementation, the one or more ALUs 1006 may reside within or on a processor chipset (e.g., the processor 1000) . In some other implementations, the one or more ALUs 1006 may reside external to the processor chipset (e.g., the processor 1000) . One or more ALUs 1006 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 1006 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 1006 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 1006 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 1006 to handle conditional operations, comparisons, and bitwise operations.
[0125] The processor 1000 may support wireless communication in accordance with examples as disclosed herein. In some examples the processor 1002 may be configured to or operable to support a means for transmitting, to a second device, a first message after the first device determines to initiate a contention based random access procedure, in which the first message comprises a first random identity (ID) ; and a means for determining whether at least one second random ID in at least one second message matches the first random ID, wherein the at least one second message is part of a set of second messages from the second device after transmission of the first message. The processor 1000 may be configured to or operable to support other means for other implementations of method 1100. In some other examples, the processor 1002 may be configured to or operable to support a means for receiving, from a first device, a first message associated with initiating a contention based random access procedure, wherein the first message comprises a first random identity (ID) ; and a means for transmitting a set of second messages after reception of the first message, in which the set of second messages comprises information for the first device to determine whether at least one second random ID in at least one second message matches the first random ID. The at least one second message is part of the set of second messages. The processor 1000 may be configured to or operable to support other means for other implementations of method 1200.
[0126] FIG. 11 illustrates a flowchart of a method 1100 that supports contention resolution of contention based random access, such as contention resolution of contention based random access for an A-IoT device, 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 first device 201 or a UE 104 or an A-IoT device 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.
[0127] At 1105, the method includes transmitting, to a second device, a first message after the first device determines to initiate a contention based random access procedure, in which the first message comprises a first random identity (ID) . The operations of 1105 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1105 may be performed by a device as described with reference to FIG. 1A to FIG. 10.
[0128] At 1110, the method includes determining whether at least one second random ID in at least one second message matches the first random ID, in which the at least one second message is part of a set of second messages from the second device after transmission of the first message. The operations of 1110 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1110 may be performed by a device as described with reference to FIG. 1A to FIG. 10.
[0129] FIG. 12 illustrates a flowchart of a method 1200 that supports contention resolution of contention based random access, such as contention resolution of contention based random access for an A-IoT device, 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 second device 203 or a reader or the UE 104 (acts as a reader) or the network entity 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.
[0130] At 1205, the method includes receiving, from a first device, a first message associated with initiating a contention based random access procedure, wherein the first message comprises a first random identity (ID) . The operations of 1205 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1205 may be performed by a device as described with reference to FIG. 1A to FIG. 10.
[0131] At 1210, the method may include transmitting a set of second messages after reception of the first message, in which the set of second messages comprises information for the first device to determine whether at least one second random ID in at least one second message matches the first random ID, and wherein the at least one second message is part of the set of second messages. The operations of 1210 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1210 may be performed by a device as described with reference to FIG. 1A to FIG. 10.
[0132] It should be noted that the methods described herein describes 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.
[0133] 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.
[0134] 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
[0135] 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.
[0136] 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.
[0137] 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 first device comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:transmit, via the transceiver and to a second device, a first message after the first device determines to initiate a contention based random access procedure, wherein the first message comprises a first random identity (ID) ; anddetermine whether at least one second random ID in at least one second message matches the first random ID, wherein the at least one second message is part of a set of second messages from the second device after transmission of the first message.2.The first device of claim 1, wherein the at least one second message is received prior to first transmission from the second device to the first device, wherein the first transmission is subsequent to second transmission scheduling a resource for transmitting the first message.3.The first device of claim 2, wherein the first transmission comprises one of the following:a first trigger message;a set of trigger messages;a paging message; ora command message.4.The first device of claim 3, wherein a second trigger message in the second transmission for scheduling the resource for transmitting the first message and the first trigger message are non-consecutive trigger messages.5.The first device of claim 1, wherein the at least one second message is associated with a second trigger message scheduling a resource for transmitting the first message.6.The first device of claim 5, wherein the at least one second message associated with the second trigger message comprises a first number of second messages received subsequent to the first message.7.The first device of claim 6, wherein the first number is associated with at least one of the following:a number of resources scheduled by the second trigger message;a response type of a second message;a number of consecutive trigger messages;a number of resources for transmitting first messages; oran indicated value in message transmission from the second device to the first device.8.The first device of claim 7, wherein the message transmission comprises at least one of the following:a paging message;a second message; ora trigger message.9.The first device of claim 7, wherein and the processor is further configured to one of the following:based on the response type indicating that a second message corresponds to a first message resource, determine that the first number is equal to: a second number of resources scheduled by the second trigger message, or a product of the second number and the number of the consecutive trigger messages;based on the response type indicating that a second message corresponds to one or more first message resources in a time domain resource, determine that the first number is equal to: a third number of time domain resources scheduled by the second trigger message, or a product of the third number and the number of the consecutive trigger messages; orbased on the response type indicating that a second message corresponds to first message resources in a plurality of time domain resources, determine that the first number is equal to 1 or the number of the consecutive trigger messages.10.The first device of claim 5, wherein the at least one second message associated with the second trigger message comprises a first flag value, wherein the first flag value is matched with a second flag value in the second trigger message.11.The first device of claim 1, wherein the at least one second message comprises a second message associated with a resource for transmitting the first message.12.The first device of claim 11, wherein the processor is further configured to determine that the second message is associated with the resource based on:a resource index comprised in the second message; orthe resource index and a trigger message index comprised in the second message.13.The first device of claim 12, wherein the resource index comprises one of the following:a resource order of the resource;a time domain index associated with the resource; ora frequency domain index associated with the resource.14.The first device of any of claims 1-13, wherein the processor is further configured to:receive, via the transceiver and from the second device, at least one of the following:a response type of a second message;a trigger message index of a second trigger message scheduling a resource for transmitting the first message;a resource index of the resource for transmitting the first message.15.A second device comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:receive, via the transceiver and from a first device, a first message associated with initiating a contention based random access procedure, wherein the first message comprises a first random identity (ID) ; andtransmit, via the transceiver, a set of second messages after reception of the first message, wherein the set of second messages comprises information for the first device to determine whether at least one second random ID in at least one second message matches the first random ID, and wherein the at least one second message is part of the set of second messages.16.The second device of claim 15, wherein the information comprises at least one of the following:a flag value associated with a trigger message;a resource index indicating one of at least one resource for transmitting at least one first message; ora trigger message index of a trigger message.17.The second device of claim 16, wherein the resource index comprises one of the following:a resource order of a resource;a time domain index associated with a resource; ora frequency domain index associated with the resource.18.The second device of claim 15, wherein the processor is further configured to:transmit, via the transceiver, a response type of a second message indicating one of the following:the second message corresponding to a first message resource;the second message corresponding to one or more first message resources in a time domain resource; orthe second message corresponding to first message resources in a plurality of time domain resources.19.A processor for wireless communication, comprising:at least one memory; anda controller coupled with the at least one memory and configured to cause the controller to:transmit, to a second device, a first message after the first device determines to initiate a contention based random access procedure, wherein the first message comprises a first random identity (ID) ; anddetermine whether at least one second random ID in at least one second message matches the first random ID, wherein the at least one second message is part of a set of second messages from the second device after transmission of the first message.20.A method performed by a first device, the method comprising:transmitting, to a second device, a first message after the first device determines to initiate a contention based random access procedure, wherein the first message comprises a first random identity (ID) ; anddetermining whether at least one second random ID in at least one second message matches the first random ID, wherein the at least one second message is part of a set of second messages from the second device after transmission of the first message.
Citation Information
Patent Citations
Contention resolution in random access procedures
CN114651497A
Contention based random access procedure for mobile communications
US20220256608A1