PUCCH Resource Allocation for Carrier Aggregation
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Solution Overview
Problem
Existing resource allocation methods in wireless communication networks with carrier aggregation are inadequate for supporting more than four downlink secondary cell transmissions per transmission time interval (TTI) without resource collision, leading to reduced user data rate and spectral efficiency.
Innovation Solution
A method where a base station allocates and manages PUCCH resources by configuring resource groups for user terminals, sorting them by priority, and selecting resource sets based on calculated weights to minimize resource allocation while reducing collisions, thereby optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional PUCCH resources are allocated to support more than four downlink Scell transmissions per TTI, then the number of supported transmissions increases, but the resources available for transmitting user data decrease
Solution Approach 1:
The patent merges resource allocation for multiple user terminals by configuring resource groups that are shared among multiple UEs. Instead of allocating dedicated resources to each UE, the system creates pooled resource groups that can be dynamically assigned, thereby reducing total resource consumption while supporting more simultaneous transmissions.
Solution Approach 2:
The patent introduces dynamic resource selection through weight calculation and priority-based allocation. The base station dynamically determines which resource sets to allocate based on current system conditions, UE priorities, and resource availability, allowing the system to adaptively support variable numbers of transmissions without over-provisioning resources.
2Productivity
If resource allocation is optimized to minimize PUCCH resources, then spectral efficiency increases, but the probability of resource collision must be managed
Solution Approach 1:
The patent applies preliminary action by pre-configuring resource groups and calculating weights for each resource set before actual transmission occurs. The base station prepares multiple candidate resource sets with associated weights, and UEs are pre-informed of their configured resource groups, enabling collision-free allocation without requiring additional resources during the transmission moment.
Solution Approach 2:
The patent implements feedback mechanisms where the base station monitors resource usage and collision patterns, then adjusts weight calculations and resource group configurations accordingly. This feedback loop allows the system to learn from past allocations and optimize resource distribution to minimize collisions while maintaining high spectral efficiency.
Data Source
AI summary
Methods and apparatus are disclosed for allocating PUCCH resources for HARQ feedback so as to minimize the total number PUCCH resources that are allocated while avoiding resource collision. A base station in an uplink Pcell allocates resource sets for use by a plurality of user terminals for providing HARQ feedback to support downlink transmissions to the user terminals in the same transmission time interval. The base station configures a resource group for each user terminal. Each resource group comprises a predetermined number of the allocated resource sets. The base station sorts the user terminals in the order of priority from highest to lowest and selects, in order of priority, a resource set for each user terminal from its configured resource group. To select resources for the user terminal, the base station calculates a weight for each resource set available to the user terminal, and allocate an available resource set with minimum weight to the user terminal.