Preconfigured Uplink Resource Scheduling for Wireless Terminal Latency Reduction
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Solution Overview
Problem
In wireless communication systems, terminals face challenges in efficiently transmitting uplink data to a base station while coexisting with other terminals, particularly in next-generation mobile communication systems that require high data traffic acceptance, increased transmission rates, and low latency.
Innovation Solution
A method for a terminal to receive a preconfigured uplink resource from a base station, involving RRC signaling, where the terminal transmits uplink data using a demodulated reference signal sequence across multiple subcarriers, with frequency hopping between slots, allowing efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminals transmit uplink data using traditional scheduling methods, then the base station can control resource allocation, but the transmission efficiency decreases and latency increases due to frequent scheduling requests and grant transmissions
Solution Approach 1:
The base station performs preliminary action by configuring preconfigured Uplink Resources (PUR) in advance through RRC signaling, allowing terminals to transmit uplink data without waiting for dynamic scheduling grants. The terminal selects and transmits uplink data using the pre-configured PUR, eliminating the time-consuming scheduling request and grant exchange, thereby reducing latency and improving transmission efficiency.
2Adaptability or versatility
If the base station dynamically schedules uplink resources for each terminal, then resource allocation flexibility is improved, but the overhead increases and transmission rate decreases
Solution Approach 1:
The base station performs preliminary configuration of PUR parameters including time resources, frequency resources, and modulation and coding scheme through RRC signaling before actual data transmission. This preliminary setup eliminates the need for dynamic scheduling overhead during data transmission, allowing the terminal to directly use the pre-configured resources for high-speed uplink data transmission without resource allocation flexibility being compromised.
Solution Approach 2:
The patent applies parameter changes by allowing the terminal to select from multiple pre-configured PUR sets with different parameters (time resources, frequency resources, MCS) based on actual transmission needs. The terminal can change the selected PUR parameters dynamically while maintaining the efficiency benefits of pre-configuration, thus achieving both high transmission rate and adaptability.
3Power
If terminals use wideband transmission for uplink data, then transmission rate increases, but the difficulty of detecting and measuring increases due to resource constraints
Solution Approach 1:
The patent applies segmentation by dividing the uplink transmission into two parts: a first portion transmitted using wideband resources for high transmission rate, and a second portion transmitted using narrowband resources for ease of measurement. The terminal transmits the first uplink data using wideband PUR, then transmits the second uplink data using narrowband PUR, allowing the base station to easily measure resource usage while maintaining high overall transmission rate through the wideband portion.
Data Source
AI summary
The present specification provides a method whereby a terminal receives a preconfigured uplink resource from a base station, and a device for same. In particular, the method whereby a terminal receives a preconfigured uplink resource from a base station comprises: receiving a preconfigured uplink (UL) resource (PUR) configuration through RRC signaling from the base station; and if the terminal is in idle mode, transmitting uplink data to the base station by using a preconfigured uplink resource, wherein the preconfigured uplink resource comprises 12 subcarriers, the uplink data comprises a de-modulated reference signal (DMRS) sequence having a first length and including six subcarriers, and the de-modulated reference signal sequence may be transmitted using six of the 12 subcarriers.