Channel Subset Allocation for Uplink Contention Collision Reduction
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Solution Overview
Problem
In wireless communications, contention-based transmissions among user equipments (UEs) on multiple channels lead to increased collisions and overhead due to each UE needing to listen on and contend for multiple channels, resulting in inefficient channel usage and conflict resolution.
Innovation Solution
The method involves allocating channel subsets to UEs, allowing them to contend only within their allocated subset, reducing the number of competing UEs and minimizing collisions by restricting access to specific subsets, which are dynamically or pre-configured based on network requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs perform contention-based transmissions on multiple channels using a contention-based mechanism, then network capacity is improved, but channel collisions and overhead for resolving collisions increase
Solution Approach 1:
The patent divides the set of N channels into multiple channel subsets (first channel subset, second channel subset, etc.). Each UE is assigned to specific channel subsets and only contends for channels within its assigned subsets. This segmentation reduces the number of channels each UE must monitor and contend for, thereby reducing collisions while maintaining overall network capacity through parallel contention in multiple subsets.
2Adaptability or versatility
If each UE listens on multiple channels to determine channel availability, then channel access opportunities increase, but carrier sensing overhead and complexity increase
Solution Approach 1:
By segmenting channels into subsets and assigning specific subsets to each UE, the patent reduces the number of channels each UE must monitor. Instead of listening to all N channels, a UE only needs to monitor its assigned channel subsets, significantly reducing carrier sensing overhead and device complexity while still providing multiple channel access opportunities through the subset structure.
3Productivity
If multiple carriers are used to improve network capacity, then throughput increases, but the number of channels each UE must contend for increases
Solution Approach 1:
The patent segments the multiple carriers/channels into distinct subsets and assigns them to different UEs. This segmentation allows parallel contention processes to occur simultaneously in different channel subsets without UEs interfering with each other's contention time. Each UE contends only within its assigned subsets, reducing the effective contention time per UE while maintaining high overall network capacity through the multi-carrier structure.
Data Source
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AI summary
According to some embodiments, a base station (BS) transmits a first allocation of a plurality of channel subsets to user equipments (UEs) for contention transmission of the UEs to the BS. The first allocation allocates one or more channel subsets to each UE so that each UE can only contend for channels within a channel subset allocated to the UE using a contention-based mechanism. In response to receipt of the first allocation, one or more UEs send requests to the BS requesting for access of channels for uplink transmissions determined by the one or more UEs. The BS determines, based on at least the requests sent by the UEs, channels to be allocated to the UEs for performing uplink transmissions, and sends a second allocation indicating the allocated channels. The UEs then perform uplink transmissions based on the second allocation.