5G NR Sidelink Random Access and Scheduling Request for Wearable Devices
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Solution Overview
Problem
Current technologies face challenges in enabling efficient random access and scheduling request procedures for wearable user equipment (wUEs) in fifth-generation (5G) new radio (NR) sidelink communications, particularly in forming and managing personal area networks (PANs) between wUEs and network user equipment (nUEs.
Innovation Solution
The implementation of dynamic scheduling of random access (RA) and scheduling request (SR) resources using control channels, where RA and SR procedures are embedded within data transmission, allowing wUEs to discover and connect with nUEs through specific frame structures and channel allocations, including control, TAS, RAS, data, and ACK channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wearable user equipment (wUEs) use traditional random access procedures in 5G NR sidelink, then network access is possible, but access efficiency and connection speed are insufficient for wearable device requirements
Solution Approach 1:
The patent applies preliminary action by pre-configuring random access resources and scheduling request resources before the wUE needs to access the network. The nUE pre-allocates specific time-frequency resources for RA and SR, so when the wUE needs to connect, it can immediately use these pre-prepared resources without waiting for resource allocation procedures, thus reducing connection establishment time and improving access efficiency.
2Device complexity
If separate control channels are established for random access and scheduling requests, then channel functionality is clear, but system complexity and resource overhead increase
Solution Approach 1:
The patent merges the random access channel and scheduling request channel into a unified resource framework. Both RA and SR share the same physical resources (time-frequency blocks) and follow a similar procedure structure, reducing the number of separate channel definitions and signaling messages needed. This consolidation reduces system complexity while maintaining clear functional differentiation through resource allocation patterns and procedure sequencing.
3Speed
If wearable user equipment transmit scheduling requests frequently to ensure timely data transmission, then data transmission responsiveness improves, but uplink resource consumption and network overhead increase
Solution Approach 1:
The patent applies partial action by implementing a backoff mechanism and maximum retry limits for scheduling requests. Instead of continuously transmitting SR messages, the wUE transmits SR only when necessary (partial action) and stops after a certain number of attempts or time interval. This reduces unnecessary uplink transmissions and energy consumption while still ensuring timely data transmission when the channel is actually available, balancing responsiveness with resource efficiency.
Data Source
AI summary
Embodiments of a system and method for random access and scheduling request for new radio things sidelink are generally described herein. In some embodiments, a nUE (network user equipment) schedules a RA (random access) resource in a control channel. The nUE decodes a TAS (transmitter resource acquisition and sounding) payload, received from a wUE (wearable user equipment) in a PRB (physical resource block) addressed to a RA-ID (random access identifier) associated with the nUE. The nUE encodes, in response to decoding the TAS payload, a RAS (receiver resource acknowledgement and sounding) payload in the PRB. The nUE decodes initial access content received via a data channel from the wUE, the initial access content including a pro posed temp ID (temporary identifier) for addressing the wUE. The nUE encode, in response to the initial access content, an ACK (acknowledgement), addressed to the wUE, to accept initial access of the wUE.