SRS Resource Allocation for UL FSS and Combined Cells
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Solution Overview
Problem
The coexistence of Uplink Frequency Selective Scheduling (UL FSS) and Combined Cell configurations in LTE wireless communication systems is hindered due to conflicting SRS configuration requirements, leading to excessive processing power consumption and exceeding the specified SRS resource capacity, making it unfeasible to use UL FSS in combined cell scenarios.
Innovation Solution
A flexible SRS resource allocation scheme is implemented, dividing SRS resources into fast and slow pools with different periodicities, allowing for dynamic configuration based on device conditions to support both UL FSS and Combined Cell features, enabling their simultaneous use by allocating appropriate resources to communication devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fast SRS resources are allocated to all communication devices to support UL FSS, then UL FSS can function properly with fast channel quality updates, but SRS consumes more processing power than needed for sector selection and exceeds the specified SRS resource capacity
Solution Approach 1:
The patent segments communication devices into two groups: UL FSS enabled devices and non-UL FSS devices. Each group receives appropriately configured SRS resources - fast SRS resources for UL FSS devices and slow SRS resources for non-UL FSS devices. This segmentation resolves the contradiction by allocating fast SRS resources only where needed for UL FSS functionality while maintaining slow SRS resources for sector selection in other devices, thereby avoiding excessive resource consumption.
Solution Approach 2:
The patent applies local quality by providing different SRS configuration qualities to different devices based on their specific needs. UL FSS enabled devices receive high-quality fast SRS configuration with short periodicity for rapid channel quality updates, while other devices receive standard slow SRS configuration with long periodicity sufficient for sector selection. This localized optimization resolves the contradiction by matching resource quality to actual device requirements rather than uniformly applying fast SRS to all devices.
2Loss of energy
If slow SRS resources are allocated to communication devices for sector selection, then processing power consumption is reduced, but UL FSS cannot function properly due to insufficient channel quality update speed
Solution Approach 1:
The patent segments devices based on their operational requirements, creating distinct resource allocation paths. Devices enabled for UL FSS receive fast SRS resources with short periodicity to ensure rapid channel quality updates for frequency-selective scheduling. Devices not enabled for UL FSS receive slow SRS resources with long periodicity, sufficient for sector selection while minimizing processing power consumption. This segmentation resolves the contradiction by ensuring each device group receives the appropriate update speed for its function.
Solution Approach 2:
The patent changes the SRS configuration parameters (periodicity, frequency resources) based on the device's UL FSS status. UL FSS enabled devices are configured with fast SRS parameters including short periodicity and appropriate frequency resources for rapid channel quality measurement. Non-UL FSS devices are configured with slow SRS parameters including long periodicity, reducing processing requirements. This parameter differentiation resolves the contradiction by optimizing the balance between update speed and power consumption for each device type.
3Speed
If fast SRS configuration with short periodicity is used for all devices, then channel quality measurement speed is improved for UL FSS, but the number of required SRS resources exceeds the upper limit specified by 3GPP
Solution Approach 1:
The patent segments the device population and SRS resource pool into UL FSS-specific and general categories. Fast SRS resources with short periodicity are allocated exclusively to UL FSS enabled devices, while slow SRS resources with long periodicity are allocated to other devices. This segmentation ensures that the total number of fast SRS resources remains within 3GPP limits while still providing adequate fast channel quality measurement capability for devices that actually require UL FSS functionality.
Solution Approach 2:
The patent changes SRS configuration parameters dynamically based on device capabilities and network conditions. UL FSS enabled devices receive fast SRS configuration with short periodicity optimized for rapid channel quality measurement. Other devices receive slow SRS configuration with long periodicity optimized for energy efficiency and reduced processing. This parameter adaptation resolves the contradiction by matching resource configuration complexity to actual device needs while staying within standardized resource limits.
Data Source
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AI summary
The disclosure relates to a method (60) performed in a network node (3) for allocating uplink reference signal resources. The network node (3) is capable of uplink frequency selective scheduling and combined cell configuration. The network node (3) is further arranged to provide wireless communication to a communication device (5). The method (60) comprises configuring (61), when both uplink frequency selective scheduling and the combined cell configuration are enabled, a communication device (5) for which uplink frequency selective scheduling is enabled with resources from a second set of resources and configuring other communication devices (5) with resources from a first set of resources, and allocating (62) uplink reference signal resources from the first set of resources or the second set of resources to the communication devices (5) according to the configuration.