Contention-Based Uplink Resource Allocation in LTE-LAN
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Solution Overview
Problem
Current 3GPP LTE systems face inefficiencies in contention-based uplink transmission, particularly in large office enterprise scenarios, due to fixed resource allocation and high collision rates among user equipment (UEs), which leads to increased latency and resource management challenges.
Innovation Solution
The method involves configuring a prioritized resource list and maximum number of resources for each user equipment (UE) for contention-based transmission, allowing UEs to select resources based on their buffer status and reducing overall resource usage, while the eNodeB broadcasts essential control information on orthogonal physical uplink control channels to minimize collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If common/broadcast UL grant is used for contention based transmission, then resource allocation is simplified, but collision between UEs increases significantly
Solution Approach 1:
The patent segments the common UL grant resources into UE-specific subsets by configuring different numbers of PUCCH resources and different prioritized resource lists for different UEs. This segmentation allows each UE to select from its own subset of resources, reducing the probability of collision while maintaining the simplified broadcast grant mechanism.
Solution Approach 2:
The patent applies local quality by providing differentiated resource configurations to different UEs within the same cell. Each UE receives a customized configuration including a specific number of PUCCH resources and a prioritized resource list tailored to its buffer status and traffic characteristics, rather than using a uniform configuration for all UEs.
2Device complexity
If fixed 6 RBs are allocated for random access channel, then resource management is simplified, but resource efficiency for data transmission deteriorates
Solution Approach 1:
The patent introduces dynamic resource allocation where the number of RBs allocated for contention based transmission is no longer fixed at 6 but can be flexibly configured per UE based on its buffer status. The eNB configures each UE with a specific number of PUCCH resources and a prioritized resource list, allowing the resource allocation to adapt dynamically to varying data requirements of different UEs.
3Device complexity
If eNB provides common contention based resources, then configuration is simplified, but adaptability to individual UE data requirements decreases
Solution Approach 1:
The patent enables UEs to self-select resources from their configured prioritized resource lists based on their own buffer status and data requirements. Each UE autonomously determines which resources to use for contention based transmission without requiring real-time scheduling decisions from the eNB, combining simplified eNB configuration with adaptive UE-level resource selection.
Data Source
AI summary
Communication systems may benefit from a control channel for contention based transmission and collision avoidance. For example, communication systems of the third generation partnership project (3GPP) long term evolution (LTE) and LTE-Advanced may use such control channels for contention based transmission. In particular, such control channels may be valuable with respect to LTE-based local area network (LTE-LAN). A method, according to certain embodiments, may include preparing control information for a contention based physical uplink shared channel. The method may also include transmitting and/or receiving the control information on a physical uplink control channel and a control only physical uplink shared channel, or only on the control only physical uplink shared channel.