Logical Channel Mapping to Configured Grants in NR Unlicensed Spectrum
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Solution Overview
Problem
In New Radio (NR) unlicensed spectrum, the existing configured scheduling framework does not efficiently manage multiple configured grants within a single serving cell, leading to inefficiencies in resource allocation and increased latency for delay-sensitive services, particularly in scenarios requiring flexible time domain resource allocation and mapping between logical channels and configured grant configurations.
Innovation Solution
The proposed solution involves enhancing the RRC specification to allow for multiple active configured grants per serving cell, enabling flexible mapping between logical channels and configured grant configurations using sequences of identifiers or bitmaps, and allowing for consecutive configured resources within a slot, along with the option to perform transport block repetitions within a slot, thereby optimizing resource utilization and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple configured grants are supported within a single serving cell, then resource allocation flexibility and QoS satisfaction are improved, but device complexity and configuration management complexity increase
Solution Approach 1:
The patent segments the configured grant configuration by introducing separate configuration indices (first CG configuration index and second CG configuration index) that can independently identify different configured grants. This allows multiple configured grants to be managed through distinct identification mechanisms, enabling flexible resource allocation while maintaining organized configuration management through structured segmentation of grant parameters.
2Reliability
If multiple configured grants are supported within a single serving cell, then QoS requirements for different services are better satisfied, but the complexity of mapping logical channels to configured grants increases
Solution Approach 1:
The patent applies local quality by associating specific logical channels with specific configured grant configurations through targeted mapping relationships. Each logical channel can be mapped to appropriate configured grants based on its specific QoS requirements, allowing differentiated quality of service treatment for different services while managing mapping complexity through localized, purpose-specific associations rather than global complex mappings.
3Loss of time
If consecutive configured resources are allocated within a slot, then latency for delay-sensitive services is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple configured grants with predetermined time domain resources, including consecutive resources within slots. This advance configuration allows the UE to immediately utilize pre-arranged resources without complex real-time allocation decisions, reducing latency for delay-sensitive services while managing allocation complexity through pre-planned resource structures.
Data Source
AI summary
A method (400) performed by a UE (600). The method includes the UE receiving (s402) a message transmitted by a base station, wherein the message comprises: i) logical channel, LCH, information identifying a LCH and ii) configured grant, CG, information identifying at least one CG configuration to which the LCH is mapped.