Contention-Based Uplink Access Optimization for Mobile Communication Systems
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Solution Overview
Problem
In mobile communication systems, contention-based uplink transmission resources can lead to collisions when multiple UEs transmit data, resulting in increased transmission delay and failure probabilities, especially when large RLC SDUs are segmented.
Innovation Solution
The method determines whether to use a received contention-based uplink grant based on the size of the uplink data, allowing UEs to transmit data through the contention-based resource only when the data size is below a certain threshold or when segmentation is not required, thereby minimizing collision-related delays and failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If contention-based uplink transmission resource is allocated to multiple UEs, then transmission delay is reduced and resource allocation efficiency is improved, but collision probability increases leading to transmission failure
Solution Approach 1:
The patent segments the contention-based uplink transmission process into multiple phases: initial access phase using contention-based resources, and subsequent transmission phase using dedicated resources. This segmentation allows UEs to quickly access the network using contention-based resources for small data packets, while larger transmissions are divided into initial access followed by scheduled transmissions, thereby reducing overall transmission delay while maintaining reliability through fallback mechanisms.
Solution Approach 2:
The patent implements dynamic resource allocation where the base station monitors collision events in contention-based resources and dynamically adjusts the allocation strategy. When collisions are detected, the system dynamically transitions affected UEs from contention-based to dedicated resource allocation, optimizing the balance between transmission speed and success probability based on real-time network conditions.
2Reliability
If dedicated transmission resource is allocated to each UE, then transmission reliability is improved and collision is avoided, but transmission delay increases due to resource allocation procedure
Solution Approach 1:
The patent applies preliminary action by pre-configuring contention-based uplink resources that can be immediately used by UEs without prior scheduling requests. This allows UEs to transmit data immediately when there is uplink data to send, eliminating the resource allocation procedure delay. The system performs preliminary setup of contention resources during network initialization, enabling fast access when needed.
Solution Approach 2:
The patent makes contention-based uplink resources universal by allowing multiple UEs to simultaneously use the same resources for different purposes: initial network access, small data transmissions, and fallback after collision. This multi-functionality eliminates the need for dedicated resource allocation procedures for various transmission scenarios, reducing delay while maintaining reliability through appropriate fallback mechanisms.
3Adaptability or versatility
If large RLC SDU is segmented into multiple RLC PDUs for contention-based transmission, then transmission flexibility is improved, but collision probability and transmission failure increase
Solution Approach 1:
The patent segments large RLC SDUs into multiple RLC PDUs with clear identification of the first PDU containing the SDU header. The system applies different transmission strategies to different segments: the first PDU can be transmitted using contention-based resources for fast access, while subsequent PDUs are transmitted using dedicated resources allocated after successful initial transmission. This segmentation approach maintains transmission flexibility while improving reliability by protecting data segments from collision.
Solution Approach 2:
The patent introduces the first RLC PDU as an intermediary that carries essential SDU identification information. This intermediary PDU acts as a beacon that, when successfully transmitted using contention-based resources, enables the base station to allocate dedicated resources for transmitting the remaining PDUs. This intermediary mechanism bridges the gap between fast contention-based access and reliable dedicated transmission.
Data Source
AI summary
The present invention defines an efficient contention-based access procedure in a mobile communication system. The present invention is directed to a 3GPP LTE/LTE-A mobile communication system under discussion in the 3GPP as one of the representative next generation mobile communication system.