Variable-Length DCI for UE Transmit Power Control
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Solution Overview
Problem
Existing communication systems struggle to efficiently manage and utilize the capabilities of user equipment (UE) in next-generation radio technologies, particularly in handling variable and dynamic transmission power control, multiple access scenarios, and simultaneous signal transmissions, leading to inefficiencies and collisions.
Innovation Solution
Implementing a capability identifier (ID) system for UE devices that includes signaling capabilities during initial access, handover, or association, allowing for dynamic resource allocation and power management, and using downlink control information (DCI) for efficient transmission power control and collision avoidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable length DCI formats are used to improve power control flexibility, then power management adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic DCI formats where the number of TPC command bits varies based on operational requirements. The second DCI format is configured with a variable number of TPC command bits (6 or more bits) depending on the specific power control needs, allowing the system to adapt between fixed and variable length formats dynamically rather than using a static structure for all scenarios.
Solution Approach 2:
The patent changes the parameter of DCI format length and TPC bit allocation based on operational context. By configuring the second DCI format with at least 6 bits of TPC information and allowing variable length, the system adjusts information bit parameters to match the complexity requirements of different power control scenarios while maintaining manageable device complexity through structured design.
2Measurement precision
If multiple DCI formats with variable TPC bits are implemented, then power control precision is improved, but information processing overhead increases
Solution Approach 1:
The patent applies different DCI formats with different TPC bit allocations to different operational contexts. The second DCI format uses at least 6 bits of TPC information specifically when higher precision power control is needed, while other formats may use fewer bits for less demanding scenarios. This localized application of high-precision formats reduces overall information processing overhead while maintaining precision where required.
Solution Approach 2:
The patent uses partial action by implementing variable length TPC commands where the number of bits (6 or more) is allocated only when needed for precise power control. Rather than always using maximum precision formats, the system selectively applies the second DCI format with extended TPC bits only in scenarios requiring higher precision, thereby reducing average information processing overhead while maintaining power control precision when necessary.
3Productivity
If capability signaling is performed during initial access and handover, then resource allocation efficiency is improved, but communication protocol complexity increases
Solution Approach 1:
The patent performs capability signaling in advance during initial access and handover procedures. By having the UE report its capabilities (such as supported DCI formats, TPC bit handling, and power control features) before actual data transmission begins, the network can pre-configure optimal DCI formats and TPC parameters, improving resource allocation efficiency during subsequent operations without requiring complex real-time negotiations.
Data Source
AI summary
A method performed by a user equipment may comprise receiving first DCI of a first DCI format and receiving second DCI of a second DCI format which is different than the first DCI. The second DCI format may specify a variable number of TPC command bits and may include no less than 6 bits of TPC information. The second DCI format may be a variable length DCI format. A number of information bits of the second DCI may be less than or equal to a number of information bit of the first DCI. The second DCI may be scrambled with a SRS RNTI.