RedCap UE Scheduling Requests for 5G Gap Activation
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Solution Overview
Problem
The challenge in 5G wireless communication systems is efficiently managing gaps for various operations such as measurement, MUSIM, and transmission power control to optimize terminal performance, particularly for RedCap UEs with reduced capabilities.
Innovation Solution
The method involves transmitting UECapabilityInformation to the base station to request low latency measurement gap activation, setting up and activating measurement gaps, and performing scheduling requests during these gaps to manage operations efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement gaps are activated for RedCap UEs to perform measurements and control operations, then measurement accuracy and operational reliability are improved, but system latency increases and resource utilization efficiency deteriorates
Solution Approach 1:
The network pre-configures multiple measurement gap patterns (e.g., pattern 0, pattern 1) with different time intervals and durations before the UE needs to perform measurements. When the UE indicates its measurement needs through UECapabilityInformation, the network can immediately activate an appropriate pre-configured pattern without negotiation delays, thus maintaining measurement accuracy while minimizing latency.
Solution Approach 2:
The patent implements dynamic gap activation and deactivation mechanisms where the network can switch between different measurement gap patterns based on real-time service requirements. The MAC-CellGroupConfig IE and PUCCH-Config IE allow flexible configuration of gap parameters (mgl1, mgrp, mgta) that can be adjusted dynamically to balance measurement accuracy against latency and resource utilization efficiency.
2Reliability
If measurement gaps are configured for all UE operations, then operational reliability is improved, but resource utilization efficiency deteriorates due to idle time
Solution Approach 1:
Instead of applying uniform measurement gap configurations across all operations, the patent applies gap configurations locally and selectively based on specific UE capabilities and service requirements. The network configures different gap patterns (pattern 0 for FR2, pattern 1 for FR1)针对不同 frequency ranges and service types, ensuring measurement reliability only where and when needed, thereby maintaining operational reliability while maximizing resource utilization efficiency during non-gap periods.
Solution Approach 2:
The patent utilizes parameter changes in MAC-CellGroupConfig IE to dynamically adjust measurement gap characteristics. By modifying parameters such as gap length (mgl1: 1.5ms, 3ms, 3.5ms, 4ms, 5.5ms, 6ms), repetition period (mgrp: 20ms, 40ms, 80ms, 160ms), and offset (mgta), the system can adapt the measurement gap configuration to match actual operational needs, ensuring reliability during measurements while minimizing resource idle time during normal operations.
3Adaptability or versatility
If multiple measurement gap patterns are supported for different frequency ranges, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments the measurement gap configuration into distinct patterns for different frequency ranges: pattern 0 for FR2 (mmWave) with specific gap requirements, and pattern 1 for FR1 (sub-6GHz) with different characteristics. Each pattern is independently configured and activated based on the serving cell's frequency range, allowing the UE to handle multiple frequency ranges without increasing overall device complexity, as each segment is managed separately through standardized IEs.
Solution Approach 2:
The patent implements universal measurement gap configuration mechanisms that work across different frequency ranges and UE capabilities. The MAC-CellGroupConfig IE and PUCCH-Config IE provide a unified framework that can accommodate multiple gap patterns (pattern 0, pattern 1) and serve multiple functions: FR1 measurements, FR2 measurements, and dynamic pattern switching. This multi-functional approach enhances frequency range adaptability while avoiding separate complex configuration systems for each scenario.
Data Source
AI summary
The method includes receiving, by the terminal from a base station, the RRCReconfiguration includes a one or more gap configuration and a MAC-CellGroupConfig and a one or more uplink bandwidth part configuration, triggering a Scheduling Request for a first MAC CE if the first MAC CE has been triggered and not cancelled and if uplink shared channel resources are not available for a new transmission, performing Scheduling Request transmission based on a specific first configuration, the specific first configuration is indicated by the first field, transmitting, by the terminal to the base station to request activation of a first gap, the first MAC CE and receiving a second MAC CE, the second MAC CE includes a fourth field and a fifth field, the fourth field indicates activation or deactivation of a second gap, the fifth field includes a value corresponding to an identifier of the second gap.