LTE Uplink Latency Reduction via Pre-allocated Resource Selection
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Solution Overview
Problem
Current LTE uplink transmission systems experience latency due to the need for devices to request and wait for grants from base stations, leading to undesirable communication delays.
Innovation Solution
The method involves acquiring configuration information for Downlink Control Information (DCI) messages to select resource assignments for Physical Uplink Shared Channel (PUSCH) transmissions, allowing devices to transmit data without waiting for grants, using contention-based resource selection and reduced subframe durations to minimize latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a device requests a grant from a base station before transmitting data, then the base station can control resource allocation, but transmission latency increases due to the waiting time for grant approval
Solution Approach 1:
The base station pre-allocates and notifies multiple uplink resources to the device in advance, before the device needs to transmit data. This eliminates the need for real-time grant requests and reduces transmission latency while maintaining resource allocation control.
Solution Approach 2:
The system dynamically allows devices to select from pre-notified resources based on current transmission needs, transitioning from static grant-based allocation to more flexible autonomous selection within predetermined resource sets.
2Adaptability or versatility
If the base station provides multiple resource assignments in a DCI message, then the device can select the most appropriate resource, but the DCI message size and processing complexity increase
Solution Approach 1:
The DCI message structure is designed to carry multiple resource assignments in an organized manner, allowing the device to process and select from segmented resource options without overwhelming complexity.
Data Source
AI summary
A method and apparatus reduce latency of Long Term Evolution (LTE) uplink transmissions. An indication can be acquired, where the indication can indicate a set of frequency domain resource blocks for possible Physical Uplink Shared Channel (PUSCH) transmission in an uplink subframe. A subset of resource blocks can be selected from the set of frequency domain resource blocks for possible PUSCH transmission based on a selection criterion. The selection criterion can use at least a resource set size acquired from the indication, can use a modulo function, and can use an identifier associated with the User Equipment (UE). The PUSCH can be transmitted in the selected subset of resource blocks in the uplink subframe.