Base Station PUCCH Resource Allocation for CSI Conflicts
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Solution Overview
Problem
In LTE networks, the increased number of user devices and antennas leads to excessive occupation of system bandwidth by physical uplink control channels (PUCCH), reducing uplink bandwidth available to user devices, as traditional configurations do not dynamically adjust periodic channel-state information (CSI) reports based on queue length and resource scheduling periods.
Innovation Solution
A base station that sends RRC messages with identical CSI report parameters to user devices, including report periods and PUCCH resource information, and uses predictive algorithms to determine which devices should report CSI, sending sleep instructions to conflict devices to avoid simultaneous reporting and optimize PUCCH resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic CSI report configuration is provided to all user devices, then channel quality information can be collected for spectrum efficiency improvement, but PUCCH bandwidth occupation increases excessively
Solution Approach 1:
The patent combines multiple CSI report configurations into a unified configuration message that can be applied to multiple user devices simultaneously. The base station generates a single RRC message containing CSI report configuration that is broadcast to multiple UEs, allowing them to share the same PUCCH resources for CSI reporting, thereby reducing overall PUCCH bandwidth occupation while maintaining comprehensive channel quality monitoring across the network.
Solution Approach 2:
The patent creates a universal CSI report configuration that can be applied across multiple user devices with different characteristics. The configuration includes parameters that can be dynamically adjusted to suit different device types, channel conditions, and traffic patterns, allowing a single configuration framework to serve multiple functions and device categories while optimizing PUCCH resource usage.
2Reliability
If PUCCH resources are allocated to all user devices for periodic CSI reporting, then spectrum usage efficiency can be improved, but uplink bandwidth available to user devices decreases
Solution Approach 1:
The patent implements periodic CSI reporting where user devices transmit channel state information at predetermined intervals rather than continuously. The RRC configuration specifies a reporting period parameter that controls the frequency of CSI reports, allowing the system to collect necessary channel quality information for spectrum efficiency while minimizing the time and bandwidth consumed by PUCCH transmissions, thereby preserving more uplink bandwidth for data traffic.
3Loss of information
If RRC layer configuration is made semi-static, then signaling overhead is reduced, but dynamic adjustment of PUCCH resources based on queue length and scheduling period becomes impossible
Solution Approach 1:
The patent introduces dynamic elements into the RRC configuration by including parameters that can be adjusted based on current network conditions. The CSI report configuration contains fields for reporting period, time shift, and PUCCH resource indicators that can be modified by the base station according to queue length, scheduling period, and channel conditions, allowing the semi-static RRC layer to adapt dynamically without requiring frequent reconfiguration signaling.
Solution Approach 2:
The patent implements a feedback mechanism where the base station monitors uplink queue length and scheduling status, then uses this information to dynamically adjust CSI reporting parameters through RRC reconfiguration. The system continuously adapts the reporting period and PUCCH resource allocation based on real-time network state feedback, optimizing the balance between signaling overhead and resource utilization efficiency.
Data Source
AI summary
A base station capable of allocating channel status reports includes a memory, a communication module and a processor. The processor is configured to send RRC configuration messages each including a periodic CSI parameter set and a discontinuous reception parameter set to user devices respectively. The periodic CSI parameter set includes a report period, a report time shift and a piece of PUCCH resource information. The RRC configuration messages include the same report period, the same report-time shift and the same PUCCH resource information. The processor is configured to determine one of a plurality of conflicting user devices among the user devices will report a CSI when predicting that the plurality of conflicting user devices will report the CSI simultaneously. The processor is configured to send a sleep instruction to the conflicting user devices except the conflicting user device determined to report the CSI.