Wireless Device Random Access Procedure Switching
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Solution Overview
Problem
The existing 2-step Random Access (RA) procedure in wireless communications experiences delays due to the Backoff Indicator in MsgB, which does not consider the uneven load on different RA types, leading to strained resources and delayed network access for UE.
Innovation Solution
Configuring the UE to ignore the Backoff Indicator in MsgB and switch to a 4-step RA procedure under specific conditions, such as high load on 2-step resources or reaching the maximum number of 2-step RA attempts, allowing immediate access to the network without waiting for the specified backoff period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE follows the Backoff Indicator in MsgB during 2-step RA procedure, then the network load is reduced, but the UE access latency increases and network efficiency decreases
Solution Approach 1:
The patent implements dynamic procedure switching between 2-step and 4-step RA based on real-time load conditions. The network dynamically determines whether to indicate 2-step RA or 4-step RA in MsgB, and the UE dynamically switches procedures based on this indication. This dynamic adaptation allows the system to optimize between latency (using 2-step when lightly loaded) and load management (using 4-step when heavily loaded), resolving the contradiction between access speed and network load reduction.
2Loss of time
If the UE switches to 4-step RA procedure immediately without waiting for backoff period, then access latency is reduced, but the 2-step RA resources remain strained
Solution Approach 1:
The network provides feedback to the UE through MsgB, which includes an indication of whether to continue with 2-step RA or switch to 4-step RA. This feedback mechanism allows the network to control the switching decision based on current load conditions. When the network detects high load on 2-step resources, it can indicate in MsgB that the UE should switch to 4-step RA, thereby reducing latency while maintaining resource balance. The feedback loop ensures that switching decisions are coordinated with network capacity.
3Productivity
If the network maintains separate resource configurations for 2-step and 4-step RA, then resource utilization efficiency is improved, but the system complexity increases
Solution Approach 1:
The patent makes the MsgB message structure universal to serve both 2-step and 4-step RA procedures. The same MsgB format can indicate either procedure type through configuration flags or indication fields. This multi-functionality allows the network to maintain separate optimized resource configurations for each procedure type while using a unified signaling mechanism, thereby improving resource utilization without proportionally increasing system complexity. The universal MsgB structure acts as a flexible interface that adapts to different RA procedure requirements.
Data Source
AI summary
A method by a wireless device includes transmitting, to a network node, a first message to initiate a 2-step Random Access (RA) procedure to access a network. After transmitting the first message, the wireless device receives, from the network node, a second message including at least one parameter indicating that the wireless device is to wait a period of time before reattempting to access the network using the 2-step RA procedure. Based on the parameter indicating that the wireless device is to wait a period of time before reattempting to access the network using the 2-step RA procedure, the wireless device attempts to access the network using a 4-step RA procedure without waiting for the period of time.