Contention based shared uplink resource allocation
By controlling and configuring replica transmission for contention-based uplink resource allocation in IoT-NTN systems, the system enhances uplink capacity and reduces signaling overhead, addressing the capacity and efficiency challenges in NB-IoT networks.
Patent Information
- Application Number
- PCT/CN2024/110184
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2026-02-12
AI Technical Summary
Existing IoT-NTN systems face challenges in supporting massive capacity for uplink transmissions, particularly in NB-IoT, and require efficient mechanisms to reduce uplink and downlink signaling for Early Data Transmission (EDT) transactions, especially in contention-based scenarios.
A system and method for controlling and configuring contention-based shared uplink resource allocation by determining a target value for the number of replicas and replica patterns based on configuration information, using a cancellation-based contention resolution mechanism like CRDSA, to enhance uplink capacity.
Improves uplink capacity and reduces collision likelihood through controlled replica transmission, ensuring efficient access to shared resources and enhancing the success rate of packet reception in challenging radio conditions.
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Figure CN2024110184_12022026_PF_FP_ABST
Abstract
Description
CONTENTION BASED SHARED UPLINK RESOURCE ALLOCATIONFIELD
[0001] Various example embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to methods, devices, apparatuses and computer readable storage medium for contention based shared uplink resource allocation.BACKGROUND
[0002] A non-terrestrial network (NTN) refers to a network or segment of networks using radio frequency (RF) resources on board a satellite or unmanned aircraft system (UAS) platform. Internet of Things (IoT) NTN, short for Internet of Things via Non-Terrestrial Networks, refers to the integration of IoT technologies with non-terrestrial communication systems to extend IoT connectivity beyond the limits of traditional terrestrial infrastructure. Narrow Band (NB) IoT NTN is already being commercially deployed. Based on the existing IoT-NTN deployment and deployment plan, it is identified the support of massive capacity is needed for IoT-NTN, in particular NB-IoT. Multiplexing of user equipment (UEs) by usage of orthogonal cover codes (OCC) for Narrowband Physical Uplink Shared Channel (NPUSCH) format 1 and NPRACH are being studied.
[0003] Apart from enhancements above, reducing the necessary uplink and downlink signaling to complete an Early Data Transmission (EDT) transaction may be beneficial. Further study in this respect is also needed.SUMMARY
[0004] In a first aspect of the present disclosure, there is provided a first apparatus. The first apparatus includes at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first apparatus (110) at least to: receive (310, 410, 510, 610, 710, 810) , from a second apparatus (120) , configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission, the configuration information indicating at least one of: at least one candidate value for a number of replicas (201, 202) ; or at least one candidate replica pattern (201 and 202; 203; 204 and 205) ; and determine (315, 420, 515, 620, 715, 820) a target value for the number of replicas (201, 202) and / or a target replica pattern (201 and 202) based on the configuration information.
[0005] In a second aspect of the present disclosure, there is provided a second apparatus. The second apparatus includes at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the second apparatus (120) at least to: transmit (305, 405, 505, 605, 705, 910) , to a first apparatus (110) , configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission, the configuration information indicating at least one of: at least one candidate value for a number of replicas (201, 202) ; or at least one candidate replica pattern (201 and 202; 203; 204 and 205) .
[0006] In a third aspect of the present disclosure, there is provided a method. The method includes: receiving (310, 410, 510, 610, 710, 810) , at a first apparatus (110) from a second apparatus (120) , configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission, the configuration information indicating at least one of: at least one candidate value for a number of replicas (201, 202) ; or at least one candidate replica pattern (201 and 202; 203; 204 and 205) ; and determining (315, 420, 515, 620, 715, 820) a target value for the number of replicas (201, 202) and / or a target replica pattern (201 and 202) based on the configuration information.
[0007] In a fourth aspect of the present disclosure, there is provided a method. The method includes: transmitting (305, 405, 505, 605, 705, 910) , from a second apparatus (120) to a first apparatus (110) , configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission, the configuration information indicating at least one of: at least one candidate value for a number of replicas (201, 202) ; or at least one candidate replica pattern (201 and 202; 203; 204 and 205) .
[0008] In a fifth aspect of the present disclosure, there is provided a first apparatus. The first apparatus includes means for receiving (310, 410, 510, 610, 710, 810) , from a second apparatus (120) , configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission, the configuration information indicating at least one of: at least one candidate value for a number of replicas (201, 202) ; or at least one candidate replica pattern (201 and 202; 203; 204 and 205) ; and means for determining (315, 420, 515, 620, 715, 820) a target value for the number of replicas (201, 202) and / or a target replica pattern (201 and 202) based on the configuration information.
[0009] In a sixth aspect of the present disclosure, there is provided a second apparatus. The second apparatus includes means for transmitting (305, 405, 505, 605, 705, 910) , to a first apparatus (110) , configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission, the configuration information indicating at least one of: at least one candidate value for a number of replicas (201, 202) ; or at least one candidate replica pattern (201 and 202; 203; 204 and 205) .
[0010] In a seventh aspect of the present disclosure, there is provided a computer readable medium. The computer readable medium includes instructions stored thereon for causing an apparatus to perform at least the method according to the third aspect or the fourth aspect.
[0011] It is to be understood that the Summary section is not intended to identify key or essential features of embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure may become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Some example embodiments will now be described with reference to the accompanying drawings, where:
[0013] FIG. 1 illustrates an example communication environment in which example embodiments of the present disclosure may be implemented;
[0014] FIG. 2 illustrates a schematic diagram of a replica pattern;
[0015] FIG. 3 illustrates a signaling flow for determining a target value for the number of replicas and / or a target replica pattern according to some example embodiments of the present disclosure;
[0016] FIG. 4 illustrates a signaling flow for determining a target value for the number of replicas and / or a target replica pattern according to some example embodiments of the present disclosure;
[0017] FIG. 5 illustrates a signaling flow for determining a target value for the number of replicas and / or a target replica pattern according to some example embodiments of the present disclosure;
[0018] FIG. 6 illustrates a signaling flow for determining a target value for the number of replicas and / or a target replica pattern according to some example embodiments of the present disclosure;
[0019] FIG. 7 illustrates a signaling flow for determining a target value for the number of replicas and / or a target replica pattern according to some example embodiments of the present disclosure;
[0020] FIG. 8 illustrates a flowchart of a method implemented at a first apparatus according to some example embodiments of the present disclosure;
[0021] FIG. 9 illustrates a flowchart of a method implemented at a second apparatus according to some example embodiments of the present disclosure;
[0022] FIG. 10 illustrates a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure; and
[0023] FIG. 11 illustrates a block diagram of an example computer readable medium in accordance with some example embodiments of the present disclosure.
[0024] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0025] Principle of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. Embodiments described herein may be implemented in various manners other than the ones described below.
[0026] 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.
[0027] References in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment 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 are not necessarily referring to the same embodiment. 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.
[0028] It shall be understood that although the terms “first, ” “second, ” …, etc. in front of noun (s) and the like may be used herein to describe various elements, these elements may not be limited by these terms. These terms are only used to distinguish one element from another and they do not limit the order of the noun (s) . For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.
[0029] As used herein, “at least one of the following: <a list of two or more elements>” and “at least one of <a list of two or more elements>” and similar wording, where the list of two or more elements are joined by “and” or “or” , mean at least any one of the elements, or at least any two or more of the elements, or at least all the elements.
[0030] As used herein, unless stated explicitly, performing a step “in response to A” does not indicate that the step is performed immediately after “A” occurs and one or more intervening steps may be included.
[0031] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It may be further understood that the terms “includes” , “including” , “has” , “having” , “comprises” and / or “comprising” , 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.
[0032] As used in this application, the term “circuitry” may refer to one or more or all of the following:
[0033] (a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and
[0034] (b) combinations of hardware circuits and software, such as (as applicable) :
[0035] (i) a combination of analog and / or digital hardware circuit (s) with software / firmware and
[0036] (ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and
[0037] (c) hardware circuit (s) and or processor (s) , such as a microprocessor (s) or a portion of a microprocessor (s) , that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.
[0038] This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
[0039] As used herein, the term “communication network” refers to a network following any suitable communication standards, such as 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. Furthermore, the communications between a terminal device 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) , the sixth generation (6G) 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 may of course also be future type communication technologies and systems with which the present disclosure may be embodied. It may not be seen as limiting the scope of the present disclosure to only the aforementioned system.
[0040] As used herein, the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives 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) , an evolved NodeB (eNodeB or eNB) , an NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, an Integrated Access and Backhaul (IAB) node, a low power node such as a femto, a pico, a non-terrestrial network (NTN) or non-ground network device such as a satellite network device, a low earth orbit (LEO) satellite and a geosynchronous earth orbit (GEO) satellite, an aircraft network device, and so forth, depending on the applied terminology and technology. In some example embodiments, radio access network (RAN) split architecture includes a Centralized Unit (CU) and a Distributed Unit (DU) at an IAB donor node. An IAB node includes a Mobile Terminal (IAB-MT) part that behaves like a UE toward the parent node, and a DU part of an IAB node behaves like a base station toward the next-hop IAB node.
[0041] The term “terminal device” refers to any end device that may be capable of wireless communication. By way of example rather than limitation, a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) . The terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, 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 and applications (e.g., remote surgery) , an industrial device and applications (e.g., 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. The terminal device may also correspond to a Mobile Termination (MT) part of an IAB node (e.g., a relay node) . In the following description, the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.
[0042] As used herein, the term “resource, ” “transmission resource, ” “resource block, ” “physical resource block” (PRB) , “uplink resource, ” or “downlink resource” may refer to any resource for performing a communication, for example, a communication between a terminal device and a network device, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other combination of the time, frequency, space and / or code domain resource enabling a communication, and the like. In the following, unless explicitly stated, a resource in both frequency domain and time domain may be used as an example of a transmission resource for describing some example embodiments of the present disclosure. It is noted that example embodiments of the present disclosure are equally applicable to other resources in other domains.
[0043] FIG. 1 illustrates an example communication environment 100 in which example embodiments of the present disclosure may be implemented. In the communication environment 100, a plurality of communication devices, including a first apparatus 110 and a second apparatus 120 may communicate with each other.
[0044] In the example of FIG. 1, the second apparatus 120 has a certain coverage range, which may be called as a serving area or a source cell. The first apparatus 110 is located in the cell managed by the second apparatus 120. In the communication environment 100, the second apparatus 120 may communicate data and control information with the first apparatus 110.
[0045] In some example embodiments, if the first apparatus 110 is a terminal device and the second apparatus 120 is a network device, a link from the second apparatus 120 to the first apparatus 110 is referred to as a downlink (DL) , while a link from the first apparatus 110 to the second apparatus 120 is referred to as an uplink (UL) . In DL, the second apparatus 120 is a transmitting (TX) device (or a transmitter) and the first apparatus 110 is a receiving (RX) device (or a receiver) . In UL, the first apparatus 110 is a TX device (or a transmitter) and the second apparatus 120 is a RX device (or a receiver) .
[0046] It is to be understood that the number of apparatuses and their connections shown in FIG. 1 are only for the purpose of illustration without suggesting any limitation. The communication environment 100 may include any suitable number of apparatuses configured to implementing example embodiments of the present disclosure.
[0047] In the following, for purpose of illustration, some example embodiments are described with the first apparatus 110 operating as a terminal device and the second apparatus 120 operating as a network device. However, in some example embodiments, operations described in connection with a terminal device may be implemented at a network device or other device, and operations described in connection with a network device may be implemented at a terminal device or other device.
[0048] Communications in the communication environment 100 may be implemented according to any proper communication protocol (s) , including, but not limited to, cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (5G) , the sixth generation (6G) , and the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and / or any other protocols currently known or to be developed in the future. Moreover, the communication may utilize any proper wireless communication technology, including but not limited to: Code Division Multiple Access (CDMA) , Frequency Division Multiple Access (FDMA) , Time Division Multiple Access (TDMA) , Frequency Division Duplex (FDD) , Time Division Duplex (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiple (OFDM) , Discrete Fourier Transform spread OFDM (DFT-s-OFDM) and / or any other technologies currently known or to be developed in the future.
[0049] In some example embodiments, the communication environment 100 is an NTN network including one or more satellites. In some example embodiments, an access network device (such as, a gNB) may be deployed at a satellite, also referred to as a regenerative architecture. Alternatively, in some example embodiments, an access network device may be deployed separately from the satellite, such as, deployed on the ground, also referred to as transparent architecture. In the present disclosure, according to the specific application scenario or requirements, either or both of the satellite and the access network device may be considered as the second apparatus 120. A terminal device in the NTN network may be considered as the first apparatus 110. Embodiments of the present discourse is not limited in this regard.
[0050] Enhancements of IoT-NTN may include the objective on support of capacity enhancements for uplink, for example, enhancements to enable multiplexing of multiple UEs (e.g. up to the min of 4 and the maximum allowed by the existing UL and DL signaling) in a single 3.75 kHz or 15 kHz subcarrier via orthogonal cover codes (OCC) for NPUSCH format 1 and Narrowband Physical Random Access Channel (NPRACH) . Meanwhile, multi-tone support for 15 kHz SCS may be considered, necessary signaling (s) may be specified, if needed, and RF requirements may be updated accordingly, if needed.
[0051] The following enhancements may be also studied to reduce the necessary uplink and downlink signaling to complete an Early Data Transmission (EDT) transaction, for example, Msg3 transmission without Msg1 (e.g. Random Access Preamble) / Msg2 (e.g. Random Access Response (RAR) ) , efficient delivery (reduced overhead) of Msg4 (e.g. RRCEarlyDataComplete) , and so on. Study is made on contention-based Msg3 transmission to complete an EDT-like transaction. The discussion is continued on Diversity Slotted ALOHA (DSA) and Contention Resolution Diversity Slotted Aloha (CRDSA) for Msg3-EDT transmissions without Msg1 / RAR. The DSA approach may be used for transmission of RACH preamble replicas.
[0052] In the DSA and CRDSA access method, a terminal device (e.g., a UE) may transmit multiple replicas to reduce the impact of collision in contention based transmissions and also rely on cancellation based contention resolution to improve the throughput / capacity. Therefore, DSA / CRDSA-like mechanism may be considered as the enhanced random access techniques to improve uplink capacity. However, the details on incorporating DSA / CRDSA-like mechanism into 3GPP NTN technologies are not disclosed.
[0053] DSA and CRDSA have been specified as a random access method for satellite communication. The high level operational mechanism of the specified CRDSA may include a transmission process and a reception and decoding process, as follows.
[0054] ● Transmission Process
[0055] 1) Packet Replication: Each terminal generates multiple copies (typically two or three) of the same packet.
[0056] 2) Random Slot Selection: The replicas are transmitted in randomly selected slots within a predefined frame. This random selection ensures that replicas are spread out, reducing the likelihood of all replicas colliding.
[0057] 3) Tagging and Identification: Each packet replica is tagged with information that allows the receiver to identify and correlate the replicas.
[0058] ● Reception and Decoding
[0059] 1) Collision Detection: The receiver (e.g., satellite gateway) monitors the slots for incoming packets. If a slot contains a single packet, it is successfully received. If a slot contains multiple packets, a collision is detected.
[0060] 2) Interference Cancellation: When a collision occurs, the receiver uses the correctly received replicas from other slots to reconstruct and decode the collided packets. This process, known as interference cancellation or successive interference cancellation, allows the recovery of collided packets using the diversity of the replicas.
[0061] FIG. 2 illustrates a schematic diagram 200 of replica patterns. As shown in FIG. 2, a CRDSA window with a plurality of UL subframes are illustrated. For each UL subframe, there may be one or more replicas (201, 202, 203, 204, 205) transmitted.
[0062] In CRDSA, the term "replicas" may refer to multiple instances of the same packet that are transmitted by a UE. The UE may transmit several replicas of the same packet to increase the probability of successful detection by the base station, especially in challenging radio conditions.
[0063] Multiple replicas may help ensure that at least one copy of the packet is received and detected by the base station, even if some are lost due to fading or interference. In the meanwhile, coverage enhancement may be achieved. By repeating the packet, the UE may improve its chances of being heard (i.e. the packet is properly received and decoded by the base station) , which is particularly important for the case where signal strength might be weak.
[0064] The "replica pattern" defines how and when these replicas are transmitted. It may include information on the timing and frequency resources used for each replica. Specifically, in one example, the replica pattern specifies the time intervals between the transmission of different replicas. In another example, the replica pattern also defines the frequency resources for related replicas, where each replica may be transmitted using different frequency resources to reduce the impact of frequency-selective fading.
[0065] In the example shown in FIG. 2, the replicas 201 and 202 are both labeled “3” , which indicates that a packet labeled “3” is to be transmitted repeatedly by using the replicas 201 and 202. Similarly, the replica 203 is a repetition of a packet labeled “1” and the replicas 204 and 205 are repetitions of a packet labeled “2” .
[0066] The replica patterns indicate how and when the replicas shown in FIG. 2 are transmitted. For example, a replica pattern associated with the replicas 201 and 202 corresponding to the packet labeled “3” indicates that they are to be transmitted in adjacent UL subframes, and an another replica pattern associated with replicas 204 and 205 corresponding to a different packet labeled “2” indicates that they are to be transmitted in different UL subframes from the replica pattern associated with the replica 202, but in the same frequency resources as the replica 202.
[0067] To control or configure the terminal to generate multiple replica of the same packet, the network control center (NCC) indicates the number of replica (i.e. number of instance) via Random Access Traffic Method Descriptor in the Terminal Information Message (TIM) -B, which needs to be transmitted sufficiently often so that the terminals may acquire necessary information within a reasonable time window. Therefore, in the current solution in DVB-RCS2, the number of replica is explicitly indicated by NCC to the terminals in TIM-B.
[0068] Though DSA and CRDSA have been used in satellite communication system, the access control configuration from the network is designed using the satellite communication protocol stack structure, frame structure and signaling mechanism as discussed above. This cannot be fully reused without any change from conventional solutions. How to incorporate the DSA / CRDSA-like techniques into contention based transmission for NTN IoT small data such as Msg3-EDT transmission on the shared UL resources to enhance the UL capacity needs to be studied. Specifically, there is a need to further study how the base station (BTS) controls / configures the UE to use / access the contention based shared resources for UL transmission (s) , which may be single transmission or multiple transmission replicas with either random resource selection or pre-configured resource selection in a fast and efficient way.
[0069] Example embodiments of the present disclosure consider applying cancellation based contention resolution mechanism as in CRDSA for shared UL resource access to improve the UL capacity in 3GPP technology, focusing on the configuration from the BTS to the UE to control the UE to determine the replica transmission operation for contention based access using shared UL resource.
[0070] According to some example embodiments of the present disclosure, there is provided a solution for control and configuration on contention based shared (CBS) uplink (UL) resource allocation with multiple UL transmissions. Specifically, the proposed solutions consider applying a cancellation based contention resolution mechanism as in CRDSA for shared UL resource access to improve the UL capacity in 3GPP technology, focusing on the configuration from the BTS to the UE to control the UE to determine the replica transmission operation for contention based access using shared UL resource.
[0071] Example embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.
[0072] FIG. 3 illustrates a signaling flow 300 for determining a target value for the number of replicas and / or a target replica pattern according to some example embodiments of the present disclosure. For the purposes of discussion, the signaling flow 300 will be discussed with reference to FIG. 1, for example, by using the first apparatus 110 and the second apparatus 120. In some example embodiments, the first apparatus 110 may be discussed with a terminal device, e.g., a UE, and the second apparatus 120 may be discussed with a network device, e.g., a BTS or gNB.
[0073] In the signaling flow 300, the second apparatus 120 transmits (305) to the first apparatus 110, configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission. The configuration information indicates at least one candidate value for a number of replicas (201, 202) , at least one candidate replica pattern (201 and 202; 203; 204 and 205) , and / or the like. The first apparatus 110 receives (310) the configuration information from the second apparatus 120. Thus, the first apparatus 110 may determine the target value for the number of replicas and / or target replica pattern based on the indicated candidate value (s) / candidate replica pattern (s) .
[0074] In some example embodiments, the candidate value (s) may be indicated by the configuration information in various ways, either explicitly or implicitly. For example, the configuration information may explicitly include a set of candidate values for the replica number. In another example, the configuration information may include a set of conditions corresponding to different values of replica number. Thus, the candidate value (s) may be indicated by the set of conditions in an implicit way. Alternatively, the configuration information may include a mapping from different candidate values to different sequences of a pilot signal. This is also an implicit way for indicating the candidate value (s) .
[0075] Likewise, the at least one candidate replica pattern may be indicated in various ways. For example, a candidate replica pattern may be indicated by a list of UL grant index, a list of a time and frequency domain resource of the UL grant in configured shared UL resources, a pattern index, or a mapping from different replica pattern to different sequence of a pilot signal, and / or the like.
[0076] In some example implementations, the candidate pattern (s) may imply candidate value (s) for the number of replicas. In this case, the candidate value (s) for the number replicas may be indicated implicitly.
[0077] Based on the configuration information, the first apparatus 110 determines (315) a target value for the number of replicas (201, 202) and / or a target replica pattern (201 and 202) . In some example embodiments, the target replica pattern may be selected randomly from the at least one candidate replica pattern.
[0078] In some example implementations, the first apparatus 110 may obtain from the configuration information, a set of conditions on the number of replicas or the at least one candidate replica pattern. Each condition in the set of conditions may correspond to a candidate value for the number of replicas or at least one candidate replica pattern. In this case, the configuration information may be received via for example, but not limited to, a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) . The dedicated signaling message may be a message dedicated for transmitting the configuration information, for example, a dedicated RRC signaling. In some example embodiments, it is possible that the MIB and / or the DCI only points to the pre-defined configuration information, rather than includes all the information related to configurations, because there may be insufficient room in these MIB / DCI to transmit the configuration information itself.
[0079] It is to be understood that the above ways for transmitting the configuration information are just discussed for example, rather than suggesting any limitation. The configuration information may be received via other suitable message or in other suitable ways in other example embodiments of the present disclosure.
[0080] Based on the set of conditions, the first apparatus 110 may determine the target value and / or the target replica pattern based on the set of conditions. In some example embodiments, the first apparatus 110 may determine information about a signal quality between the first apparatus 110 and the second apparatus 120 and then determine a target condition from the set of conditions based on the information about the signal quality. With the target condition, the first apparatus 110 may determine, one or a combination of the target value of the number of replicas, the candidate value of the target replica pattern or at least one candidate replica pattern that corresponds to the target condition.
[0081] The target condition may be determined based on the set of conditions in an alternative way. In some example embodiments, the first apparatus 110 may determine information about successful rate of contention resolution in the contention based transmission, and then determine a target condition from the set of conditions based on the information about the successful rate of contention resolution. With the target condition, the first apparatus 110 may determine a candidate value and / or at least one candidate replica pattern corresponding to the target condition as the target value and / or the target replica pattern. More details related to set of conditions will be discussed below with respect to FIG. 4.
[0082] Alternatively, in some example embodiments, the configuration information may not include the set of conditions, but include a single candidate value for the number of replicas and / or at least one candidate replica pattern. In this case, the first apparatus 110 may receive the configuration information via downlink control information (DCI) addressed to a common Radio Network Temporary Identifier (RNTI) , and determine the single candidate value as the target value. Furthermore, in some example embodiments, the configuration information may also include configuration information for monitoring the downlink control information (DCI) related to the single candidate value for the number of replicas and / or at least one candidate replica pattern. More details in this regard will be discussed below with respect to FIG. 5.
[0083] As a further alternative, in some example embodiments, the first apparatus 110 may obtain, from the configuration information, a mapping relationship between sequences of a pilot signal and candidate values for the number of replicas and / or at least one candidate replica pattern. Thus, upon receiving a certain sequence of the pilot signal in downlink from the second apparatus 120, the first apparatus 110 may determine the target value from the candidate values based on a received sequence of the pilot signal. More details in this regard will be discussed below with respect to FIG. 6.
[0084] In some further alternative example embodiments where the candidate pattern (s) may imply candidate value (s) for the number of replicas, the first apparatus 110 may determine the target replica pattern from the at least one candidate replica pattern and then determine the target value for the number of replicas from the at least one candidate replica pattern. More details in this regard will be discussed below with respect to FIG. 7.
[0085] Optionally, in some embodiments, the second apparatus 120 may transmit (301) , to the first apparatus 110, an indication that indicates an activation of using replicas in the contention based transmission. For example, a signal may be introduced to indicate the activation of replica / repetition-based transmissions. Upon receiving (302) the indication the first apparatus 110 may be aware the activation of replica / repetition-based transmissions.
[0086] Optionally, in some example embodiments, the target value for the number of replicas may be determined based on a base value and a corresponding offset value. The base value for the target value may be preconfigured by the second apparatus 120. For example, the base value may be received from the second apparats 120 via at least one of a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) . A candidate value indicated in the configuration information received 310 from the second apparats 120 may represent an offset, and thus there may be one or more offsets indicated by the configuration information. By determining a target offset from one or more offsets and computing the sum of the base value and the target offset, the first apparatus 110 may determine the target value for the number of replicas.
[0087] In view of the above, the proposed configuration and control mechanism allows the first apparatus 110, e.g., UE, accessing to the shared UL resources in contention but more controlled way provided by the network (NW) . The corresponding signaling mechanism such as the configured conditions or DCI provides the fast and dynamic way for the network to control the UE’s behavior e.g. based on network preference in different network conditions. The proposed replica pattern provided from the second apparatus 120, e.g., BTS or NW enables the UE to select the UL resources for replica transmission more easily with less processing overhead.
[0088] In example embodiments of the present disclosure, the number of replica / repetition for the contention based access may be configured by the second apparatus 120, e.g., BTS to the first apparatus 110, e.g., UE (common and / or dedicated signaling) in a fast and dynamic way based on the load, collision rate, coverage level, etc. The configuration may be provided in various ways. The following discussions with respect to FIGS. 4-7 will provide more details.
[0089] FIG. 4 illustrates a signaling flow 400 for determining a target value for the number of replicas and / or a target replica pattern according to some example embodiments of the present disclosure. For the purposes of discussion, the signaling flow 400 will be discussed with reference to FIG. 1, for example, by using the first apparatus 110 and the second apparatus 120. In some example embodiments, the first apparatus 110 may be discussed with a terminal device, e.g., a UE, and the second apparatus 120 may be discussed with a network device, e.g., a BTS or gNB. The example embodiments discussed with respect to FIG. 4 are implementations of the example embodiments discussed with reference to FIG. 3. In the example of FIG. 4, the candidate value (s) for the number of replicas and / or candidate replica pattern (s) may be indicated by a set of conditions.
[0090] In the signaling flow 400, the second apparatus 120 transmits (405) to the first apparatus 110, configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission. The configuration information indicates at least one candidate value for a number of replicas (201, 202) , at least one candidate replica pattern (201 and 202; 203; 204 and 205) , and / or the like. The first apparatus 110 receives (410) the configuration information from the second apparatus 120. Thus, the first apparatus 110 may determine the target value for the number of replicas and / or target replica pattern based on the indicated candidate value (s) / candidate replica pattern (s) .
[0091] As discussed above, in the example embodiments of FIG. 4, the candidate value (s) for the number of replicas and / or candidate replica pattern (s) may be indicated by a set of conditions. The first apparatus 110 may obtain (415) , from the configuration information, the set of conditions on the number of replicas or the at least one candidate replica pattern (201 and 202; 203; 204 and 205) . Each condition in the set of conditions that corresponds to a candidate value for at least one of: the number of replicas (201, 202) or the at least one candidate replica pattern (201 and 202; 203; 204 and 205) .
[0092] Based on the set of conditions, the first apparatus 110 may determine (420) the target value and / or the target replica pattern (201 and 202) . There may be various ways to determine the target value and / or the target replica pattern.
[0093] In some example implementations, the first apparatus 110 may determine information about a signal quality / received power level between the first apparatus 110 and the second apparatus 120, and determine a target condition from the set of conditions based on the information about the signal quality / received power level, such as reference signal receiving power (RSRP) , reference signal receiving quality (RSRQ) , signal to interference plus noise ratio (SINR) , and so on. Then, the first apparatus 110 may determine the target value of the number of replicas, the candidate value (s) of the target replica pattern, at least one candidate replica pattern that corresponds to the target condition, alone or in combination. In this way, the first apparatus 110 may obtain the target value and / or determine the target replica pattern from the at least one candidate replica pattern, for example, by randomly selection.
[0094] As an alternative, the first apparatus 110 may determine information about successful rate of contention resolution in the contention based transmission, and determine a target condition from the set of conditions based on the information about the successful rate of contention resolution. Thus, the first apparatus 110 may determine a candidate value corresponding to the target condition as the target value. Alternatively or in addition, the first apparatus 110 may determine a candidate replica pattern corresponding to the target condition as the target replica pattern.
[0095] In some examples, the conditions / triggers for different values of the number of replica / repetition are configured from the second apparatus 120, e.g., BTS to the first apparatus 110, e.g., UE and the UE determines the number of replica / repetition based on the configured conditions / triggers. For instance, the BTS may configure the UE to adjust the number of replicas based on the received DL RSRP / RSRQ ranges, and / or the BTS may configure the UE to increase or decrease the number of replicas based on the successful contention resolution between the configured minimum and maximum number of replicas, etc. The conditions / triggers may be configured via SIB or dedicated signaling.
[0096] Additionally, in some example embodiments, the base value of the number of replica may be configured via DCI and the configured conditions on DL RSRP range may be used by the UE to determine the offset of the number of replica. Then, the number of replica may be calculated from the base value and the offset value. Another example is the MIB or SIB may indicate the base number of replica (s) / repetition (s) together with the configured conditions on DL RSRP range.
[0097] FIG. 5 illustrates a signaling flow 500 for determining a target value for the number of replicas and / or a target replica pattern according to some example embodiments of the present disclosure. For the purposes of discussion, the signaling flow 500 will be discussed with reference to FIG. 1, for example, by using the first apparatus 110 and the second apparatus 120. In some example embodiments, the first apparatus 110 may be discussed with a terminal device, e.g., a UE, and the second apparatus 120 may be discussed with a network device, e.g., a BTS or gNB. The example embodiments discussed with respect to FIG. 5 are implementations of the example embodiments discussed with reference to FIG. 3. In the exmaple of FIG. 5, the configuration information may include a single candidate value for the number of replicas and / or at least one candidate replica pattern.
[0098] In the signaling flow 500, the second apparatus 120 may determine (501) the single candidate value or at least one candidate replica pattern based on one or more factors, such as a cell load, a collision rate, and / or the like.
[0099] Then, the second apparatus 120 may transmit (505) the configuration information via downlink control information (DCI) addressed to a common Radio Network Temporary Identifier (RNTI) . This configuration information may include a single candidate value for the number of replicas or at least one candidate replica pattern (201, 202) . The first apparatus 110 may receive (510) the configuration information via DCI addressed to the RNTI and may determine (515) the single candidate value as the target value or determine the target replica pattern from the at least one candidate replica pattern, e.g. by random selection.
[0100] Specifically, in some example implementations, the number of replica / repetition or at least one candidate replica pattern may be commonly and dynamically configured from the second apparatus 120, e.g., BTS via DCI. In this case, one common RNTI may be introduced for shared UL resources. The DCI addressed to the common RNTI is used by the BTS to indicate the number of replicas or at least one candidate replica pattern based on the monitored cell load, collision rate, etc., in the BTS. In this option, a new DCI format may be introduced for configuring the number of replica or at least one candidate replica pattern.
[0101] In some example embodiments, the configuration information received (510) by the first apparatus 110 may include configuration information for monitoring the downlink control information (DCI) related to configuring the number of replica or at least one candidate replica pattern. For example, to reduce the complexity for the first apparatus 110, e.g., UE is configured by the BTS the new DCI transmission starting slot and interval for monitoring the DCI related to configuring the number of replica or at least one candidate replica pattern.
[0102] In addition, in some example embodiments of FIG. 5, the single value indicated in the configuration information via DCI may be an offset value, which is similar to the example embodiments of FIG. 4 to a certain extent. In this case, the base value of the number of replica may be preconfigured and the target value for the number of replica may be calculated based on the preconfigured base value and the offset value received (510) via DCI.
[0103] FIG. 6 illustrates a signaling flow 600 for determining a target value for the number of replicas and / or a target replica pattern according to some example embodiments of the present disclosure. For the purposes of discussion, the signaling flow 600 will be discussed with reference to FIG. 1, for example, by using the first apparatus 110 and the second apparatus 120. In some example embodiments, the first apparatus 110 may be discussed with a terminal device, e.g., a UE, and the second apparatus 120 may be discussed with a network device, e.g., a BTS or gNB.
[0104] The example embodiments discussed with respect to FIG. 6 are implementations of the example embodiments discussed with reference to FIG. 3. In the exmaple of FIG. 6, the number of replica / repetitions or at least one candidate replica pattern may implicitly mapped from different sequences of a pilot signal transmitted from the second apparatus 120 in downlink.
[0105] In the signaling flow 600, the second apparatus 120 transmits (605) to the first apparatus 110, configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission. The configuration information may include a mapping relationship between sequences of a pilot signal and candidate values for the number of replicas and / or at least one candidate replica pattern. The first apparatus 110 receives (610) the configuration information from the second apparatus 120. Then, the first apparatus 110 may obtain (615) , from the configuration information, a mapping relationship between sequences of a pilot signal and candidate values for the number of replicas and / or at least one candidate replica pattern.
[0106] The second apparatus 120 may transmit (616) a sequence of the pilot signal to trigger the determination of the targe value / target replica pattern. Upon receiving (618) from the second apparatus 120, a sequence of the pilot signal in downlink, the first apparatus 110 may determine the target value for the number of replicas and / or target replica pattern based on the sequence of the pilot signal received (618) from the second apparatus 120.
[0107] In addition, in some example embodiments of FIG. 6, the sequence of the pilot signal received (618) from the second apparatus 120 may indicates an offset value. In this case, the base value of the number of replica may be preconfigured and the target value for the number of replica may be calculated based on the preconfigured base value and the offset value.
[0108] FIG. 7 illustrates a signaling flow 700 for determining a target value for the number of replicas and / or a target replica pattern according to some example embodiments of the present disclosure. For the purposes of discussion, the signaling flow 700 will be discussed with reference to FIG. 1, for example, by using the first apparatus 110 and the second apparatus 120. In some example embodiments, the first apparatus 110 may be discussed with a terminal device, e.g., a UE, and the second apparatus 120 may be discussed with a network device, e.g., a BTS or gNB. The example embodiments discussed with respect to FIG. 7 are implementations of the example embodiments discussed with reference to FIG. 3. In the exmaple of FIG. 7, the configuration information may include candidate replica pattern (s) that imply candidate value (s) for the number of replicas.
[0109] In the signaling flow 700, the second apparatus 120 may transmit (705) the candidate replica pattern (s) to the first apparatus 110. The configuration information may indicate at least one candidate replica pattern (201 and 202; 203; 204 and 205) for a replica-based transmission. The at least one candidate replica pattern may imply the candidate value (s) for the number of replicas. The first apparatus 110 may determine (715) the target replica pattern from the at least one candidate replica pattern. Alternatively or in addition, the first apparatus 110 may determine (720) the target value for the number of replicas from the at least one candidate replica pattern.
[0110] More specifically, in some example, embodiments, the replica / repetition patterns are configured by the BTS to the UE as the processing and signaling efficient way to facilitate the UE to select the UL resource for UL replica transmission.
[0111] The replica pattern may be configured as a list of UL grant index or a list of time and frequency domain resources of the UL grant in the configured shared UL resources. Optionally, each of replica pattern may be configured with the replica pattern index and / or the mapping of sequence of the pilot signal in downlink and the replica pattern.
[0112] The different replica patterns may be configured via SIB or dedicated signaling to the UE. Additionally, the different replica patterns may be associated with the pattern index.
[0113] In one example embodiment, the SIB or a dedicated signaling may be used to configure all possible replica patterns to the UE, of which different replica pattern sub-sets may correspond to different number of replicas. When BTS determines the number of replicas that UE may transmit in UL, the BTS may use DCI to indicate the valid / activated pattern index that corresponds to the determined number of replicas, which may be also used as the implicit configuration of the number of replicas based on the replica pattern length.
[0114] Additionally, in some example embodiments, if the UL grants in different replica patterns are partially overlapping in time and frequency, an associated pilot / DMRS sequence may be configured for each pattern so that the BTS may identify the replica / repetition pattern based on the pilot / DMRS sequence that the UE used in their UL transmission. For example, in a case where the UL grants in different replica patterns are partially overlapping in time domain and frequency domain, the UE may transmit a pilot / DMRS sequence associated with the replica pattern. Upon receiving the pilot / DMRS sequence, the BTS may understand which replica pattern is being used by the UE based on the association or mapping relationship between the pilot / DMRS sequence and the replica pattern.
[0115] Example embodiments discussed with respect to the above FIGS. 3 to 7 are about configuring and controlling the first apparatus 110, e.g., UE for contention based UL resource access. In these example embodiments, the UL transmission may be Early Data Transmission (EDT) using 2-step RACH procedure or PUR (Pre-configured UL Resource) transmission for e.g. IoT services. In either case, the second apparatus 120, e.g., BTS may configure the shared UL resources, which may include the RA preamble related configuration, either using SIB or dedicated RRC signaling.
[0116] Additionally, the BTS may need to configure the UE the contention resolution related information to control the UE to perform CRDSA-like random access. For instance, in a first option, the BTS may configure the conditions for different number of replica transmissions. UE may monitor and detect the conditions and then determine the number of replica. Optionally, if the BTS configures the replica pattern for UL replica transmission, the UE may randomly select one of replica patterns that corresponds to the determined number of replica and use the selected replica pattern to transmit the UL replica.
[0117] The replica patterns may be configured by the BTS within the pattern time window that may be configurable or fixed by the standard. The time domain information of the replica pattern may indicate the offset from the beginning of the time window. When UE randomly selects one of the replica patterns, in one implementation option, the UE is allowed to start the replica transmission only in the first replica resource within the pattern time window, i.e. the replica transmissions are within the same pattern time window.
[0118] Alternatively, in another implementation option, the UE is allowed to start the replica transmission in any of replica resource within the pattern time window, i.e. the replica transmission may across the pattern time window. The former option may cause the delay of starting replica transmission, but easier to identify the group of the replica transmission. The latter option enables the replica transmission with less delay, but the additional replica sequence number may be used to identify the group of the replica transmission. The BTS may also configure whether replica transmission across the pattern time window is allowed or not.
[0119] FIG. 8 shows a flowchart of an example method 800 implemented at a first apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 800 will be described from the perspective of the first apparatus 110 in FIG. 1.
[0120] At block 810, the first apparatus 110 receives (310, 410, 510, 610, 710, 810) , from a second apparatus 120, configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission, the configuration information indicating at least one of: at least one candidate value for a number of replicas (201, 202) ; or at least one candidate replica pattern (201 and 202; 203; 204 and 205) .
[0121] At block 820, the first apparatus 110 determines (315, 420, 515, 620, 715, 820) a target value for the number of replicas (201, 202) and / or a target replica pattern (201 and 202) based on the configuration information.
[0122] In some example embodiments, the method 800 may further include: obtaining (415) , from the configuration information, a set of conditions on the number of replicas or the at least one candidate replica pattern (201 and 202; 203; 204 and 205) , wherein each condition in the set of conditions that corresponds to a candidate value for at least one of: the number of replicas (201, 202) or the at least one candidate replica pattern (201 and 202; 203; 204 and 205) ; and determining (420) the target value and / or the target replica pattern (201 and 202) based on the set of conditions.
[0123] In some example embodiments, the method 800 may further include: determining information about a signal quality between the first apparatus 110 and the second apparatus 120; determining a target condition from the set of conditions based on the information about the signal quality; and determining, one or a combination of: the target value of the number of replicas, the candidate value of the target replica pattern or at least one candidate replica pattern that corresponds to the target condition.
[0124] In some example embodiments, the method 800 may further include: determining information about successful rate of contention resolution in the contention based transmission; determining a target condition from the set of conditions based on the information about the successful rate of contention resolution; and determining, as the target value and / or the target replica pattern, a candidate value and / or at least one candidate replica pattern corresponding to the target condition.
[0125] In some example embodiments, the configuration information may be received via at least one of: a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) .
[0126] In some example embodiments, the method 800 may further include: receiving (510) the configuration information via downlink control information (DCI) addressed to a common Radio Network Temporary Identifier (RNTI) , the configuration information including a single candidate value for the number of replicas (201, 202) or a single candidate replica pattern; and determining (515) the single candidate value as the target value or the single candidate replica pattern as the target replica pattern.
[0127] In some example embodiments, the configuration information may include configuration information for monitoring the downlink control information (DCI) .
[0128] In some example embodiments, the method 800 may further include: obtaining (615) , from the configuration information, a mapping relationship between sequences of a pilot signal (618) and candidate values for the number of replicas; and determining (620) the target value from the candidate values based on a received sequence of the pilot signal (618) .
[0129] In some example embodiments, the method 800 may further include: receiving (302) , from the second apparatus 120, an indication that indicates an activation of using replicas in the contention based transmission.
[0130] In some example embodiments, the at least one candidate value for the number of replicas includes an offset relative to a base value of the number of replicas, wherein the base value is preconfigured by the second apparatus 120.
[0131] In some example embodiments, the base value may be received via at least one of a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) .
[0132] In some example embodiments, the method 800 may further include: determining (715) the target replica pattern from the at least one candidate replica pattern; or determining (720) the target value for the number of replicas from the at least one candidate replica pattern.
[0133] In some example embodiments, the target replica pattern may be selected randomly from the at least one candidate replica pattern.
[0134] In some example embodiments, the at least one candidate replica pattern may be indicated by at least one of: a list of uplink (UL) grant index, a list of time and frequency domain resource of the UL grant in configured shared UL resources, or a pattern index.
[0135] In some example embodiments, the first apparatus 110 may include a terminal device, and the second apparatus 120 may include a network device.
[0136] FIG. 9 shows a flowchart of an example method 900 implemented at a second apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 900 will be described from the perspective of the second apparatus 120 in FIG. 1.
[0137] At block 910, the second apparatus 120 transmits (305, 405, 505, 605, 705, 910) , to a first apparatus 110, configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission, the configuration information indicating at least one of: at least one candidate value for a number of replicas (201, 202) ; or at least one candidate replica pattern (201 and 202; 203; 204 and 205) .
[0138] In some example embodiments, the configuration information may include a set of conditions on the number of replicas or the at least one candidate replica pattern (201 and 202; 203; 204 and 205) , wherein each condition in the set of conditions that corresponds to a candidate value for at least one of: the number of replicas (201, 202) or the at least one candidate replica pattern (201 and 202; 203; 204 and 205) .
[0139] In some example embodiments, the configuration information may include configuration information for monitoring the downlink control information (DCI) .
[0140] In some example embodiments, the configuration information is transmitted via at least one of: a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) .
[0141] In some example embodiments, the method 900 further includes: transmitting (505) the configuration information via downlink control information (DCI) addressed to a common Radio Network Temporary Identifier (RNTI) , the configuration information including a single candidate value for the number of replicas (201, 202) and / or a single candidate replica pattern.
[0142] In some example embodiments, the method 900 may further include: determining (501) the single candidate value and / or the single candidate replica pattern based on at least one of a cell load or a collision rate.
[0143] In some example embodiments, at least one of a start time or a transmission interval of the downlink control information (DCI) is configured by the second apparatus 120.
[0144] In some example embodiments, the configuration information may include a mapping relationship between sequences of a pilot signal and candidate values for the number of replicas or at least one candidate replica pattern.
[0145] In some example embodiments, the method 900 may further include: transmitting (301) , to the first apparatus 110, an indication that indicates an activation of using replicas in the contention based transmission.
[0146] In some example embodiments, the at least one candidate value for the number of replicas may include an offset relative to a base value of the number of replicas, wherein the base value is preconfigured by the second apparatus 120.
[0147] In some example embodiments, the base value may be transmitted to the first apparatus 110 via at least one of a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) .
[0148] In some example embodiments, the configuration information may indicate at least one candidate replica pattern for a replica-based transmission, wherein the at least one candidate replica pattern is used for determining the target replica pattern and / or the target value for the number of replicas.
[0149] In some example embodiments, the at least one candidate replica pattern may be indicated by at least one of: a list of uplink (UL) grant index, a list of time and frequency domain resource of the UL grant in configured shared UL resources, or a pattern index.
[0150] In some example embodiments, the first apparatus 110 may include a terminal device, and the second apparatus 120 may include a network device.
[0151] In some example embodiments, a first apparatus capable of performing any of the method 800 (for example, the first apparatus 110 in FIG. 1) may include means for performing the respective operations of the method 800. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The first apparatus may be implemented as or included in the first apparatus 110 in FIG. 1.
[0152] In some example embodiments, the first apparatus includes means for receiving (310, 410, 510, 610, 710, 810) , from a second apparatus 120, configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission, the configuration information indicating at least one of: at least one candidate value for a number of replicas (201, 202) ; or at least one candidate replica pattern (201 and 202; 203; 204 and 205) ; and means for determining (315, 420, 515, 620, 715, 820) a target value for the number of replicas (201, 202) and / or a target replica pattern (201 and 202) based on the configuration information.
[0153] In some example embodiments, the first apparatus may further include: means for obtaining (415) , from the configuration information, a set of conditions on the number of replicas or the at least one candidate replica pattern (201 and 202; 203; 204 and 205) , wherein each condition in the set of conditions that corresponds to a candidate value for at least one of: the number of replicas (201, 202) or the at least one candidate replica pattern (201 and 202; 203; 204 and 205) ; and means for determining (420) the target value and / or the target replica pattern (201 and 202) based on the set of conditions.
[0154] In some example embodiments, the first apparatus may further include: means for determining information about a signal quality between the first apparatus 110 and the second apparatus 120; means for determining a target condition from the set of conditions based on the information about the signal quality; and means for determining, one or a combination of: the target value of the number of replicas, the candidate value of the target replica pattern or at least one candidate replica pattern that corresponds to the target condition.
[0155] In some example embodiments, the first apparatus may further include: means for determining information about successful rate of contention resolution in the contention based transmission; means for determining a target condition from the set of conditions based on the information about the successful rate of contention resolution; and means for determining, as the target value and / or the target replica pattern, a candidate value and / or at least one candidate replica pattern corresponding to the target condition.
[0156] In some example embodiments, the configuration information may be received via at least one of: a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) .
[0157] In some example embodiments, the first apparatus may further include: means for receiving (510) the configuration information via downlink control information (DCI) addressed to a common Radio Network Temporary Identifier (RNTI) , the configuration information including a single candidate value for the number of replicas (201, 202) or a single candidate replica pattern; and means for determining (515) the single candidate value as the target value or the single candidate replica pattern as the target replica pattern.
[0158] In some example embodiments, the configuration information may include configuration information for monitoring the downlink control information (DCI) .
[0159] In some example embodiments, the first apparatus 110 may further include: means for obtaining (615) , from the configuration information, a mapping relationship between sequences of a pilot signal (618) and candidate values for the number of replicas or at least one candidate replica pattern; and means for determining (620) the target value from the candidate values and / or the target replica pattern from at least one candidate replica pattern based on a received sequence of the pilot signal (618) .
[0160] In some example embodiments, the first apparatus 110 may further include: means for receiving (302) , from the second apparatus 120, an indication that indicates an activation of using replicas in the contention based transmission.
[0161] In some example embodiments, the at least one candidate value for the number of replicas includes an offset relative to a base value of the number of replicas, wherein the base value is preconfigured by the second apparatus 120.
[0162] In some example embodiments, the base value is received via at least one of a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) .
[0163] In some example embodiments, the configuration information indicates at least one candidate replica pattern (201 and 202; 203; 204 and 205) for a replica-based transmission, the first apparatus further includes: means for determining (715) the target replica pattern from the at least one candidate replica pattern; or means for determining (720) the target value for the number of replicas from the at least one candidate replica pattern.
[0164] In some example embodiments, the target replica pattern is selected randomly from the at least one candidate replica pattern.
[0165] In some example embodiments, the at least one candidate replica pattern is indicated by at least one of: a list of uplink (UL) grant index, a list of time and frequency domain resource of the UL grant in configured shared UL resources, or a pattern index.
[0166] In some example embodiments, the first apparatus 110 includes a terminal device, and the second apparatus 120 includes a network device.
[0167] In some example embodiments, the first apparatus further includes means for performing other operations in some example embodiments of the method 800 or the first apparatus 110. In some example embodiments, the means includes at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the performance of the first apparatus.
[0168] In some example embodiments, a second apparatus capable of performing any of the method 900 (for example, the second apparatus 120 in FIG. 1) may include means for performing the respective operations of the method 900. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The second apparatus may be implemented as or included in the second apparatus 120 in FIG. 1.
[0169] In some example embodiments, the second apparatus 120 includes means for transmitting (305, 405, 505, 605, 705, 910) , to a first apparatus 110, configuration information about a plurality of replicas (201, 202, 203, 204, 205) for a packet transmission in a contention based transmission, the configuration information indicating at least one of: at least one candidate value for a number of replicas (201, 202) ; or at least one candidate replica pattern (201 and 202; 203; 204 and 205) .
[0170] In some example embodiments, the configuration information may include a set of conditions on the number of replicas or the at least one candidate replica pattern (201 and 202; 203; 204 and 205) , wherein each condition in the set of conditions that corresponds to a candidate value for at least one of: the number of replicas (201, 202) or the at least one candidate replica pattern (201 and 202; 203; 204 and 205) .
[0171] In some example embodiments, the configuration information may include configuration information for monitoring the downlink control information (DCI) .
[0172] In some example embodiments, the configuration information may be transmitted via at least one of: a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) .
[0173] In some example embodiments, the second apparatus may further include: means for transmitting (505) the configuration information via downlink control information (DCI) addressed to a common Radio Network Temporary Identifier (RNTI) , the configuration information including a single candidate value for the number of replicas (201, 202) and / or a single candidate replica pattern.
[0174] In some example embodiments, the second apparatus may further include: means for determining (501) the single candidate value and / or the single candidate replica pattern based on at least one of a cell load or a collision rate.
[0175] In some example embodiments, at least one of a start time or a transmission interval of the downlink control information (DCI) may be configured by the second apparatus 120.
[0176] In some example embodiments, the configuration information may include a mapping relationship between sequences of a pilot signal and candidate values for the number of replicas or at least one candidate replica pattern.
[0177] In some example embodiments, the second apparatus may further include: means for transmitting (301) , to the first apparatus 110, an indication that indicates an activation of using replicas in the contention based transmission.
[0178] In some example embodiments, the at least one candidate value for the number of replicas may include an offset relative to a base value of the number of replicas, wherein the base value is preconfigured by the second apparatus 120.
[0179] In some example embodiments, the base value may be transmitted to the first apparatus 110 via at least one of a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) .
[0180] In some example embodiments, the configuration information may indicate at least one candidate replica pattern for a replica-based transmission, wherein the at least one candidate replica pattern is used for determining the target replica pattern and / or the target value for the number of replicas.
[0181] In some example embodiments, the at least one candidate replica pattern may be indicated by at least one of: a list of uplink (UL) grant index, a list of time and frequency domain resource of the UL grant in configured shared UL resources, or a pattern index.
[0182] In some example embodiments, the first apparatus 110 may include a terminal device, and the second apparatus 120 may include a network device.
[0183] In some example embodiments, the second apparatus further includes means for performing other operations in some example embodiments of the method 900 or the second apparatus 120. In some example embodiments, the means includes at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the performance of the second apparatus.
[0184] FIG. 10 is a simplified block diagram of a device 1000 that is suitable for implementing example embodiments of the present disclosure. The device 1000 may be provided to implement a communication device, for example, the first apparatus 110 or the second apparatus 120 as shown in FIG. 1. As shown, the device 1000 includes one or more processors 1010, one or more memories 1020 coupled to the processor 1010, and one or more communication modules 1040 coupled to the processor 1010.
[0185] The communication module 1040 is for bidirectional communications. The communication module 1040 has one or more communication interfaces to facilitate communication with one or more other modules or devices. The communication interfaces may represent any interface that is necessary for communication with other network elements. In some example embodiments, the communication module 1040 may include at least one antenna.
[0186] The processor 1010 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 1000 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
[0187] The memory 1020 may include one or more non-volatile memories and one or more volatile memories. Examples of the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 1024, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , an optical disk, a laser disk, and other magnetic storage and / or optical storage. Examples of the volatile memories include, but are not limited to, a random access memory (RAM) 1022 and other volatile memories that may not last in the power-down duration.
[0188] A computer program 1030 includes computer executable instructions that are executed by the associated processor 1010. The instructions of the program 1030 may include instructions for performing operations / acts of some example embodiments of the present disclosure. The program 1030 may be stored in the memory, e.g., the ROM 1024. The processor 1010 may perform any suitable actions and processing by loading the program 1030 into the RAM 1022.
[0189] The example embodiments of the present disclosure may be implemented by means of the program 1030 so that the device 1000 may perform any process of the disclosure as discussed with reference to FIG. 3 to FIG. 9. The example embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
[0190] In some example embodiments, the program 1030 may be tangibly contained in a computer readable medium which may be included in the device 1000 (such as in the memory 1020) or other storage devices that are accessible by the device 1000. The device 1000 may load the program 1030 from the computer readable medium to the RAM 1022 for execution. In some example embodiments, the computer readable medium may include any types of non-transitory storage medium, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like. The term “non-transitory, ” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM) .
[0191] FIG. 11 shows an example of the computer readable medium 1100 which may be in form of CD, DVD or other optical storage disk. The computer readable medium 1100 has the program 1030 stored thereon.
[0192] Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, and other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. Although various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
[0193] Some example embodiments of the present disclosure also provide at least one computer program product tangibly stored on a computer readable medium, such as a non-transitory computer readable medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target physical or virtual processor, to carry out any of the methods as described above. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
[0194] Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. The program code may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program code, when executed by the processor or controller, cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
[0195] In the context of the present disclosure, the computer program code or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above. Examples of the carrier include a signal, computer readable medium, and the like.
[0196] The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
[0197] Further, although operations are depicted in a particular order, this may not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, although several specific implementation details are contained in the above discussions, these may not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Unless explicitly stated, certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, unless explicitly stated, various features that are described in the context of a single embodiment may also be implemented in a plurality of embodiments separately or in any suitable sub-combination.
[0198] Although the present disclosure has been described in languages specific to structural features and / or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims
A first apparatus comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the first apparatus at least to:receive, from a second apparatus, configuration information about a plurality of replicas for a packet transmission in a contention based transmission, the configuration information indicating at least one of:at least one candidate value for a number of replicas; orat least one candidate replica pattern; anddetermine a target value for the number of replicas and / or a target replica pattern based on the configuration information.The first apparatus of claim 1, wherein the first apparatus is caused to:obtain, from the configuration information, a set of conditions on the number of replicas or the at least one candidate replica pattern, wherein each condition in the set of conditions that corresponds to a candidate value for at least one of: the number of replicas or the at least one candidate replica pattern; anddetermine the target value and / or the target replica pattern based on the set of conditions.The first apparatus of claim 2, wherein the first apparatus is caused to:determine information about a signal quality between the first apparatus and the second apparatus;determine a target condition from the set of conditions based on the information about the signal quality; anddetermine, one or a combination of: the target value of the number of replicas, the candidate value of the target replica pattern or at least one candidate replica pattern that corresponds to the target condition.The first apparatus of claim 2, wherein the first apparatus is caused to:determine information about successful rate of contention resolution in the contention based transmission;determine a target condition from the set of conditions based on the information about the successful rate of contention resolution; anddetermine, as the target value and / or the target replica pattern, a candidate value and / or at least one candidate replica pattern corresponding to the target condition.The first apparatus of claim 2, wherein the configuration information is received via at least one of: a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) .The first apparatus of claim 1, wherein the first apparatus is caused to:receive the configuration information via downlink control information (DCI) addressed to a common Radio Network Temporary Identifier (RNTI) , the configuration information comprising a single candidate value for the number of replicas or a single candidate replica pattern; anddetermine the single candidate value as the target value or the single candidate replica pattern as the target replica pattern.The first apparatus of any of claims 1 to 6, wherein the configuration information comprises configuration information for monitoring the downlink control information (DCI) .The first apparatus of claim 1, wherein the first apparatus is caused to:obtain, from the configuration information, a mapping relationship between sequences of a pilot signal and candidate values for the number of replicas or at least one candidate replica pattern; anddetermine the target value from the candidate values and / or the target replica pattern from at least one candidate replica pattern based on a received sequence of the pilot signal.The first apparatus of any of claims 1 to 8, wherein the first apparatus is caused to:receive, from the second apparatus, an indication that indicates an activation of using replicas in the contention based transmission.The first apparatus of any of claims 1 to 9, wherein the at least one candidate value for the number of replicas comprises an offset relative to a base value of the number of replicas, wherein the base value is preconfigured by the second apparatus.The first apparatus of claim 10, wherein the base value is received via at least one of a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) .The first apparatus of any of claims 1 to 11, wherein the configuration information indicates at least one candidate replica pattern for a replica-based transmission, and the first apparatus is caused to at least one of:determine the target replica pattern from the at least one candidate replica pattern; ordetermine the target value for the number of replicas from the at least one candidate replica pattern.The first apparatus of claim 12, wherein the target replica pattern is selected randomly from the at least one candidate replica pattern.The first apparatus of claim 12 or 13, wherein the at least one candidate replica pattern is indicated by at least one of:a list of uplink (UL) grant index,a list of time and frequency domain resource of the UL grant in configured shared UL resources, ora pattern index.The first apparatus of any of claims 1 to 14, wherein the first apparatus comprises a terminal device, and the second apparatus comprises a network device.A second apparatus comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the second apparatus at least to:transmit, to a first apparatus, configuration information about a plurality of replicas for a packet transmission in a contention based transmission, the configuration information indicating at least one of:at least one candidate value for a number of replicas; orat least one candidate replica pattern.The second apparatus of claim 16, wherein the configuration information comprises a set of conditions on the number of replicas or the at least one candidate replica pattern, wherein each condition in the set of conditions that corresponds to a candidate value for at least one of: the number of replicas or the at least one candidate replica pattern.The second apparatus of claim 16 or 17, wherein the configuration information comprises configuration information for monitoring the downlink control information (DCI) .The second apparatus of claim 17, wherein the configuration information is transmitted via at least one of: a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) .The second apparatus of claim 16, wherein the second apparatus is caused to:transmit the configuration information via downlink control information (DCI) addressed to a common Radio Network Temporary Identifier (RNTI) , the configuration information comprising a single candidate value for the number of replicas and / or a single candidate replica pattern.The second apparatus of claim 20, wherein the second apparatus is caused to:determine the single candidate value and / or the single candidate replica pattern based on at least one of a cell load or a collision rate.The second apparatus of claim 20, wherein at least one of a start time or a transmission interval of the downlink control information (DCI) is configured by the second apparatus.The second apparatus of claim 16, wherein the configuration information comprises a mapping relationship between sequences of a pilot signal and candidate values for the number of replicas or at least one candidate replica pattern.The second apparatus of any of claims 16 to 23, wherein the second apparatus is caused to:transmit, to the first apparatus, an indication that indicates an activation of using replicas in the contention based transmission.The second apparatus of any of claims 16 to 24, wherein the at least one candidate value for the number of replicas comprises an offset relative to a base value of the number of replicas, wherein the base value is preconfigured by the second apparatus.The second apparatus of claim 25, wherein the base value is transmitted to the first apparatus via at least one of a dedicated signaling message, a system information block (SIB) , a master information block (MIB) , or downlink control information (DCI) .The second apparatus of any of claims 16 to 26, wherein the configuration information indicates at least one candidate replica pattern for a replica-based transmission, wherein the at least one candidate replica pattern is used for determining the target replica pattern and / or the target value for the number of replicas.The second apparatus of claim 27, wherein the at least one candidate replica pattern is indicated by at least one of:a list of uplink (UL) grant index,a list of a time and frequency domain resource of the UL grant in configured shared UL resources, ora pattern index.The second apparatus of any of claims 17 to 28, wherein the first apparatus comprises a terminal device, and the second apparatus comprises a network device.A first apparatus comprising:means for receiving, from a second apparatus, configuration information about a plurality of replicas for a packet transmission in a contention based transmission, the configuration information indicating at least one of:at least one candidate value for a number of replicas; orat least one candidate replica pattern; andmeans for determining a target value for the number of replicas and / or a target replica pattern based on the configuration information.A second apparatus comprising:means for transmitting, to a first apparatus, configuration information about a plurality of replicas for a packet transmission in a contention based transmission, the configuration information indicating at least one of:at least one candidate value for a number of replicas; orat least one candidate replica pattern.
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