Delayed Grant Request Mechanism for Wireless Uplink Latency Reduction
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Solution Overview
Problem
Wireless communication systems face significant latency due to processing delays and the need for UEs to wait for resource allocation grants from base stations, leading to increased latency in transmitting uplink data.
Innovation Solution
The implementation of a delayed grant request mechanism allows User Equipment (UE) to proactively request resource allocation at a future time, enabling the base station to allocate resources accordingly, thereby reducing latency by synchronizing resource allocation with the availability of uplink data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE waits for the base station to allocate resources after data becomes available, then the resource allocation can be based on actual data availability, but significant latency is incurred due to processing delays and waiting time
Solution Approach 1:
The patent applies preliminary action by having the UE send a scheduling request before data actually becomes available for transmission. The UE predicts future data availability and requests resources in advance, allowing the base station to allocate resources before the UE needs to transmit, thereby eliminating the waiting latency that would otherwise occur.
Solution Approach 2:
The patent implements feedback through the grant delay request mechanism, where the UE provides feedback to the base station about its data availability predictions. This feedback loop allows the base station to adjust resource allocation timing based on actual UE needs, creating a dynamic system that reduces latency while maintaining operational flexibility.
2Speed
If the base station allocates resources immediately upon receiving a scheduling request, then resource allocation speed is improved, but the UE cannot synchronize with future data availability leading to potential resource waste or missed transmission opportunities
Solution Approach 1:
The base station performs preliminary resource allocation by receiving and processing scheduling requests before the UE actually needs to transmit data. This advance allocation ensures resources are ready when predicted data becomes available, maintaining both speed and reliability by synchronizing allocation timing with actual transmission needs.
Solution Approach 2:
The system applies dynamics by allowing the resource allocation timing to be flexible rather than fixed. The base station can adjust the timing of resource allocation based on real-time conditions and UE predictions, creating a dynamic system that adapts to varying data availability patterns while maintaining fast allocation speeds.
3Productivity
If the UE transmits data as soon as it becomes available without advance resource requests, then transmission responsiveness is improved, but processing delays cause significant latency between data availability and actual transmission
Solution Approach 1:
The UE performs preliminary action by sending scheduling requests before data becomes available for transmission. This advance notification allows the base station to prepare and allocate resources in advance, eliminating the processing delay latency that would otherwise occur while the UE waits for resource allocation after data becomes available.
Solution Approach 2:
The patent applies the skipping principle by having the UE skip the traditional sequential process of waiting for resource allocation after data availability. Instead, the UE proactively initiates the resource allocation process before data is ready, effectively skipping the waiting period and reducing overall latency while maintaining high transmission responsiveness.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a grant delay request to a base station. The grant delay request may indicate a future time, at or thereafter a base station is requested to allocate resources to the UE. The base station may transmit the uplink grant to the UE allocating the resources to the UE based on the grant delay request, and the UE may transmit, to the base station, an uplink transmission including the uplink data based on the uplink grant. The UE may transmit the grant delay request as part of a scheduling request (SR), or as part of a buffer status report (BSR), or a combination of these.