Contention-Based Transmission Timing for Collision-Reduced Random Access
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Solution Overview
Problem
Existing wireless communication systems face challenges with collisions and delays due to multiple UEs selecting the same shared resources for contention-based random access transmissions, leading to disruptions and inefficiencies in communication.
Innovation Solution
Configuring multiple transmission occasions with non-overlapping time resources for UEs, allowing them to transmit and monitor for response messages separately, thereby reducing collisions and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs use shared resources for contention-based random access transmissions, then resource utilization is improved, but collisions and delays increase
Solution Approach 1:
The patent divides the shared resources into multiple transmission occasions with distinct time resources. Each transmission occasion is assigned to a specific UE, effectively segmenting the contention-based access process. This segmentation reduces collisions by ensuring that UEs transmit at different times rather than simultaneously on shared resources, while still maintaining efficient resource utilization through structured multiplexing.
2Speed
If multiple UEs transmit simultaneously on shared resources, then transmission speed is improved, but delays and collisions increase
Solution Approach 1:
The patent implements periodic transmission occasions where UEs are assigned specific time slots for transmission. This periodic structure allows multiple UEs to transmit at different scheduled times rather than simultaneously, reducing transmission delays and collisions while maintaining acceptable transmission speed through efficient time-division multiplexing of random access messages.
3Loss of time
If UEs monitor for response messages continuously, then response time is improved, but energy consumption increases
Solution Approach 1:
The patent configures UEs with predetermined response windows that are scheduled in advance. Instead of continuous monitoring, UEs monitor only during their assigned response windows, which are predetermined based on the transmission occasion scheduling. This preliminary configuration of monitoring intervals reduces energy consumption while ensuring timely response message detection within the scheduled windows.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A network may configure multiple transmission occasions (TOs) of a TO group such that the TOs do not occupy the same time resources (e.g., do not overlap in time). In some examples, the network may configure the TOs such that the TOs do not overlap in time with response windows for response messages. In some examples, a user equipment (UE) may not be expected to send transmissions (e.g., via TOs) and receive messages in the same time resources. In some examples, the UE may not send retransmissions for one access procedure if another access procedure has been resolved (e.g., if the UE has received a contention resolution indication corresponding to another TO in the group). Upon receiving a contention resolution indication, the UE may stop any other contention resolution timers, and send an acknowledgement message for the resolved access procedure.