JP-2026514325-A - Random access for function reduction (REDCAP) devices

JP2026514325AJP 2026514325 AJP2026514325 AJP 2026514325AJP-2026514325-A

Abstract

This is a computer-readable storage medium that stores instructions for the execution of one or more processors of the eRedCap UE. The instructions configure the eRedCap UE for the RACH procedure in 5G NR and later networks, causing the eRedCap UE to perform operations including encoding UL data for the PUSCH transmission in Msg3. The DCI format schedules a Physical Downlink Shared Channel (PDSCH) transmission for UE conflict resolution in the fourth message (Msg4). The eRedCap UE detects that the PDSCH transmission scheduled by the DCI format contains allocated PRBs that exceed the maximum number of PRBs associated with the eRedCap UE. Based on the detection that the allocated PRBs exceed the maximum number of PRBs, the eRedCap UE determines that UE conflict resolution is unsuccessful.

Inventors

チャタージー，デブディープ
リー，イーンヤーン
ワーン，イー
シオーン，ガーン

Assignees

インテルコーポレイション

Dates

Publication Date: 20260511
Application Date: 20240327
Priority Date: 20230327

Claims (20)

An apparatus for an eRedCap user equipment (UE) configured for operation in a 5th generation new wireless (5G NR) network, Processing circuit and The system includes a memory coupled to the processing circuit and configured to store the random access response (RAR) received in the second message (Msg2), To configure the eRedCap UE for the Random Access Channel (RACH) procedure in the 5G NR network, the processing circuit is: In the first message (Msg1) of the RACH procedure, a random access preamble is encoded for transmission to the base station. In Msg2 of the RACH procedure, which includes an uplink grant for the third message (Msg3) of the RACH procedure, the RAR received from the base station is decoded. In Msg3, uplink data is encoded for physical uplink shared channel (PUSCH) transmission to the base station using the uplink grant. In response to the aforementioned PUSCH transmission, the downlink control information (DCI) format is decoded in the fourth message (Msg4) received on the physical downlink control channel (PDCCH) to schedule a physical downlink shared channel (PDSCH) transmission for UE conflict resolution. The system detects that the PDSCH transmission scheduled in the DCI format includes allocated PRBs that exceed the maximum number of physical resource blocks (PRBs) associated with the eRedCap UE. A device that determines that the UE conflict resolution is unsuccessful based on the detection that the number of allocated PRBs exceeds the maximum number of PRBs.
The aforementioned processing circuit is The apparatus according to claim 1, which restarts the RACH procedure based on the detection that the number of allocated PRBs exceeds the maximum number of PRBs.
The aforementioned processing circuit is A first detection is performed in which the PDSCH bandwidth of the RAR contains a number of PRBs that exceeds the maximum number of PRBs associated with the eRedCap UE. The apparatus according to claim 1, which performs a second detection that the uplink grant for the Msg3 in the RAR is shorter than the relaxed timeline for the transmission of the Msg3.
The aforementioned processing circuit is The apparatus according to claim 3, wherein the RACH procedure is restarted based on the first detection and the second detection.
The aforementioned processing circuit is An uplink grant is detected in the received PDCCH that schedules a Hybrid Automatic Retransmission Request (HARQ) retransmission of the PUSCH transmission of Msg3, The apparatus according to claim 1, which detects a failure of the RACH procedure based on the number of PRBs allocated in the uplink grant that schedules the HARQ retransmission exceeding the maximum number of PRBs associated with the eRedCap UE.
The aforementioned processing circuit is The apparatus according to claim 5, which determines the timing for restarting the RACH procedure based on the last symbol of the downlink control information (DCI) format 0_0 that schedules the retransmission of the Msg3.
The aforementioned processing circuit is The second DCI that schedules the Hybrid Automatic Retransmission Request (HARQ) retransmission of the aforementioned Msg4 is decoded, The apparatus according to claim 1, which detects a failure of the RACH procedure based on the number of PRBs allocated for HARQ retransmission of Msg4 exceeding the maximum number of PRBs associated with the eRedCap UE.
The aforementioned processing circuit is The apparatus according to claim 7, which determines the timing for restarting the RACH procedure based on the last symbol of the downlink control information (DCI) format 1_0 that schedules the initial transmission of the Msg4 or the DCI format 1_0 that schedules the retransmission of the Msg4.
The apparatus according to any one of claims 1 to 8, wherein the maximum number of PRBs associated with the eRedCap UE is 25 for a subcarrier spacing (SCS) of 15 kHz, or 12 for a 30 kHz SCS.
A transceiver circuit coupled to the processing circuit, The apparatus according to any one of claims 1 to 8, further comprising two or more antennas coupled to the transceiver circuit.
A computer program comprising instructions for execution by one or more processors of a base station, The aforementioned instruction configures the base station for the Random Access Channel (RACH) procedure in a 5th generation new radio (5G NR) or later network, and instructs the base station to In the first message (Msg1) of the RACH procedure, the random access preamble received from the eRedCap user device (UE) is decoded. In the second message (Msg2) of the RACH procedure, which includes an uplink grant for the third message (Msg3) of the RACH procedure, a random access response is encoded for transmission to the eRedCap UE. A computer program that causes a second Msg1 of a RACH procedure, which is restarted based on the number of physical resource blocks (PRBs) allocated for Msg3 as indicated in the uplink grant, exceeding the maximum number of PRBs associated with the eRedCap UE, to perform an operation including decoding a second random access preamble received from the eRedCap UE.
The computer program according to claim 11, wherein the maximum number of PRBs associated with the eRedCap UE is 25 for a subcarrier spacing (SCS) of 15 kHz, or 12 for a 30 kHz SCS.
A computer program comprising instructions for execution by one or more processors of an extended-reduction (eRedCap) user device (UE), The aforementioned instruction constitutes the eRedCap UE for Random Access Channel (RACH) procedures in 5G NR and later networks. In the aforementioned eRedCap UE, In the first message (Msg1) of the RACH procedure, a random access preamble is encoded for transmission to the base station. In the second message (Msg2) of the RACH procedure, which includes an uplink grant for the third message (Msg3) of the RACH procedure, the random access response (RAR) received from the base station is decoded. In Msg3, uplink data is encoded for physical uplink shared channel (PUSCH) transmission to the base station using the uplink grant. In response to the aforementioned PUSCH transmission, the downlink control information (DCI) format is decoded in the fourth message (Msg4) received on the physical downlink control channel (PDCCH) to schedule a physical downlink shared channel (PDSCH) transmission for UE conflict resolution. The system detects that the PDSCH transmission scheduled in the DCI format includes allocated PRBs that exceed the maximum number of physical resource blocks (PRBs) associated with the eRedCap UE. A computer program that causes the computer program to perform an action that includes determining that the UE conflict resolution is unsuccessful based on the detection that the number of allocated PRBs exceeds the maximum number of PRBs.
The aforementioned operation is, The computer program according to claim 13, which includes restarting the RACH procedure based on the detection that the number of allocated PRBs exceeds the maximum number of PRBs.
The aforementioned operation is, A first detection is performed in which the PDSCH bandwidth of the RAR contains a number of PRBs that exceeds the maximum number of PRBs associated with the eRedCap UE. The computer program according to claim 13, comprising performing a second detection that the uplink grant for the Msg3 in the RAR is shorter than the relaxed timeline for the transmission of the Msg3.
The aforementioned operation is, The computer program according to claim 15, comprising restarting the RACH procedure based on the first detection and the second detection.
The aforementioned operation is, An uplink grant is detected in the received PDCCH that schedules a Hybrid Automatic Retransmission Request (HARQ) retransmission of the PUSCH transmission of Msg3, The computer program according to claim 13, comprising detecting a failure of the RACH procedure based on the number of PRBs allocated in the uplink grant that schedules the HARQ retransmission exceeding the maximum number of PRBs associated with the eRedCap UE.
The aforementioned operation is, The computer program according to claim 17, comprising determining the timing to restart the RACH procedure based on the last symbol of the downlink control information (DCI) format 0_0 that schedules the retransmission of the Msg3.
The aforementioned operation is, The second DCI that schedules the Hybrid Automatic Retransmission Request (HARQ) retransmission of the aforementioned Msg4 is decoded, The computer program according to claim 13, comprising detecting a failure of the RACH procedure based on the number of PRBs allocated for the HARQ retransmission of Msg4 exceeding the maximum number of PRBs associated with the eRedCap UE.
The aforementioned operation is, The computer program according to claim 19, comprising determining the timing to restart the RACH procedure based on the last symbol of the downlink control information (DCI) format 1_0 that schedules the initial transmission of the Msg4 or the DCI format 1_0 that schedules the retransmission of the Msg4.

Description

[Claiming priority] This application claims priority to and incorporates the entirety of U.S. Provisional Patent Application No. 63/492,418, entitled “SYSTEMS AND METHODS FOR RANDOM ACCESS FOR REDUCED CAPABILITY USER EQUIPMENTS,” filed on 27 March 2023. [Background technology] Mobile communications have evolved remarkably from early voice systems to today's highly sophisticated integrated communication platforms. The increasing number of different types of devices communicating with various network devices has led to increased use of 3GPP® LTE systems. The penetration of mobile devices (user equipment or UE) in modern society continues to drive demand for diverse network-connected devices in many different environments. Fifth-generation (5G) wireless systems are emerging and are expected to enable even higher speeds, connectivity, and usability. Next-generation 5G networks (or NR networks) and beyond (e.g., 6G networks) are expected to increase throughput, coverage, and robustness, while reducing latency and operational and capital expenditures. 5G-NR (and beyond) networks will continue to evolve based on 3GPP® LTE-Advanced, which has further potential new radio access technologies (RATs) to enrich people's lives with seamless wireless connectivity solutions that deliver high-speed, rich content and services. Since current cellular network frequencies are saturated, higher frequencies such as millimeter wave (mmWave) frequencies can be beneficial due to their higher bandwidth. Further enhanced operation of LTE and NR systems in licensed and unlicensed spectrums is expected in future releases and 5G and beyond. Such enhanced operation may include techniques for configuring random access for reduced-cap (RedCap) user equipment (UE). In drawings that are not necessarily to scale, similar numbers may describe the same components in different drawings. Similar numbers with different subscripts may represent different instances of the same component. Drawings generally illustrate the various aspects discussed in this document, not as limitations, but as examples. Several network architectures are shown. This document presents several non-roaming 5G system architectures. This document presents several non-roaming 5G system architectures. This document describes various systems, devices, and components that can implement embodiments of the disclosed embodiments. This document describes various systems, devices, and components that can implement embodiments of the disclosed embodiments. This document describes various systems, devices, and components that can implement embodiments of the disclosed embodiments. Several embodiments of the 4-step random access channel (RACH) procedure are presented. This document describes several RACH procedures involving early failure identification after receiving a random access response (RAR). This document describes a RACH procedure involving early failure identification after decoding downlink control information (DCI) that schedules the initial transmission of Msg4, in several embodiments. The diagrams show block diagrams of communication devices such as evolved Node-B (eNB), new generation Node-B (gNB) (or other RAN nodes), NCRs, access points (AP), wireless stations (STA), mobile stations (MS), or user equipment (UE) in several configurations. The following description and drawings are intended to illustrate embodiments to enable those skilled in the art to carry them out. Other embodiments may incorporate structural, logical, electrical, process, and other modifications. Parts and features of some embodiments may be included in or substituted for those of other embodiments. The embodiments outlined in the claims encompass all available equivalents of those claims. Figures 1A to 8 illustrate various systems, devices, and components that may implement embodiments of the disclosure in different communication systems, such as 5G-NR (and later) networks. The UEs, base stations (gNBs, etc.), and/or other nodes (e.g., satellites or other computing nodes) discussed herein can be configured to perform the technologies of the disclosure. Figure 1A shows a network architecture in several embodiments. The communication network 140A is shown to include user equipment (UE) 101 and UE102. UE101 and UE102 are shown as smartphones (e.g., handheld touchscreen mobile computing devices capable of connecting to one or more cellular networks), but may also include any mobile or non-mobile computing device, such as a personal data assistant (PDA), pager, laptop computer, desktop computer, wireless handset, drone, or any other computing device including wired and/or wireless communication interfaces. UE101 and UE102 may collectively be referred to as UE101, which can be used to perform one or more of the technologies disclosed herein. Any of the wireless links described herein (for example, those used in communication network 140A or any other illustrated network) may operate in accordance with any