Scheduling Request Configurations for Logical Channels
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing scheduling requests and resource allocation across multiple carriers, leading to inefficiencies in uplink scheduling and resource utilization, particularly as the number of aggregated carriers and PUCCHs increases, resulting in high PUCCH load on primary cells.
Innovation Solution
The implementation of advanced scheduling request mechanisms that allow for multi-bit SR configurations, dynamic SR resource management, and selective initiation of random access procedures based on logical channel priorities and availability of SR resources, enabling efficient handling of multiple SR processes and optimizing uplink resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of aggregated carriers and PUCCHs is increased to support more logical channels, then the scheduling request capability is improved, but the PUCCH load on primary cells increases
Solution Approach 1:
The patent segments the scheduling request functionality by introducing multiple SR configurations (first SR configuration and second SR configuration) that can be independently activated. This allows the system to divide the PUCCH resources into different sets, where only the necessary configurations are activated at any given time, thereby reducing the overall PUCCH load while maintaining the capability to handle multiple logical channels.
Solution Approach 2:
The patent implements dynamic SR configuration activation where the network can selectively activate or deactivate specific SR configurations based on current system conditions and logical channel requirements. This dynamic approach allows the PUCCH load to be adjusted in real-time, enabling the system to maintain high scheduling request capability only when needed, rather than continuously maintaining maximum capability across all carriers.
2Adaptability or versatility
If multiple SR processes are configured to handle different logical channels, then the scheduling flexibility is improved, but the device complexity increases
Solution Approach 1:
The patent segments SR processes into distinct first and second SR configurations, each with dedicated PUCCH resources and logical channel associations. This segmentation allows the device to manage complexity by handling each SR configuration independently through standardized procedures, rather than managing a monolithic complex SR system.
Solution Approach 2:
The patent creates universal SR configuration templates that can be applied across multiple carriers and logical channels. Each SR configuration follows the same structure and management rules, allowing the device to use identical processing logic for different configurations, thereby reducing the effective complexity despite supporting multiple processes.
3Measurement precision
If SR resources are allocated on a per-carrier basis, then the resource allocation precision is improved, but the random access procedure overhead increases
Solution Approach 1:
The patent merges multiple SR configurations into a coordinated system where the network can manage activation and deactivation centrally. This allows precise per-carrier resource allocation to be maintained while reducing random access overhead through optimized SR resource sharing and coordinated activation strategies that minimize the need for frequent random access procedures.
Data Source
AI summary
A wireless device receives a first SR configuration corresponding to first logical channel(s); and a second SR configuration corresponding to second logical channel(s). Based on the first logical channel(s) having data available for uplink transmission: a first counter, of the first SR configuration, is set to a first initial value and incremented based on transmission of a first SR associated with the first logical channel(s); and a random access preamble is transmitted in response to the first counter reaching a first counter value. Based on the second logical channel(s) having data available for uplink transmission: a second counter, of the second SR configuration, is set to a second initial value and incremented based on transmission of a second SR associated with the at least one second logical channel; and a random access preamble is transmitted in response to the second counter reaching a second counter value.