Proactive UL Grant Allocation for PING Latency Reduction
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Solution Overview
Problem
Current methods to reduce PING latency in Radio Access Networks (RANs) are complex and not robust, particularly due to user equipment (UE) inactivity leading to delays in accessing the network for PING requests and stale Power Headroom Reports (PHR) without proactive allocations.
Innovation Solution
A method that triggers proactive allocation windows for user equipment with uplink inactivity, estimating the time of PING request arrival using delay timers and adjusting the proactive allocation window size based on learning, reducing latency by providing UL grants more efficiently and handling errors in HARQ feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE sends a Scheduling Request (SR) to get UL grant for PING request transmission, then the UE can access the network, but this process introduces significant delay in the UE side to access the network
Solution Approach 1:
The network performs preliminary actions by proactively allocating UL grants to UEs with UL inactivity before they need to send PING requests. This eliminates the need for UEs to send SR and wait for UL grant, directly reducing access delay and improving network access efficiency
2Reliability
If the eNB provides UL grant without recent PHR report for UL inactive UEs, then the UE can transmit PING request, but the MCS and TPC for UL grant must be conservative due to lack of exact information
Solution Approach 1:
The network performs preliminary action by proactively allocating UL grants with appropriate MCS and TPC configurations before the UE needs to transmit PING requests. This ensures transmission reliability while avoiding conservative settings, thereby improving transmission efficiency
3Quantity of substance
If the SR periodicity is increased to support more capacity in High Capacity cells, then more capacity is supported, but the PING latency increases significantly
Solution Approach 1:
The network performs preliminary action by proactively allocating UL grants to UEs with UL inactivity, eliminating the need for UEs to wait for SR periodicity intervals. This resolves the contradiction by supporting high capacity while significantly reducing PING latency
Data Source
AI summary
A method of reducing the Packet Internet Grope (PING) latency, e.g., in 5G New Radio (NR) or LTE system, is provided. When first two PING requests are received from a user equipment (UE) in uplink (UL), the UE will use Scheduling Request (SR) and Buffer Status Report (BSR) cycle to obtain UL grants for the first two PING requests. Starting from the third PING request, the size of the proactive allocation window for giving UL allocation to the PING request is uniquely configured, using a “delay timer” and a “proactive allocation window.” The delay timer is to delay the start of the proactive allocation window from the transmission time interval (TTI) in which the packet type is detected. The proactive allocation window is the number of TTIs over which the proactive allocations are given to a UE.