Unified TCI Beam Indication for SRS BWP and Serving Cell Mapping
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Solution Overview
Problem
The challenge in wireless communication systems is efficiently controlling beam failure detection, particularly in scenarios involving multiple transmission reception points (TRPs), where clarifying the bandwidth part (BWP) and serving cell associated with a beam indication for a sounding reference signal (SRS) resource is unclear.
Innovation Solution
A method and apparatus are introduced to clarify the BWP and serving cell associated with a beam indication for an SRS resource through a Medium Access Control (MAC) control element (CE), using a unified transmission configuration indication (TCI) framework, with a one-bit indicator to determine the transmission based on configuration information or MAC CE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a unified TCI framework is used for beam indication in multiple TRPs, then beam management efficiency is improved, but clarity of BWP and serving cell association becomes unclear
Solution Approach 1:
The patent segments the beam indication process by introducing a one-bit indicator that divides the indication into two distinct modes: MAC CE-based indication (when indicator=0) and configuration information-based indication (when indicator=1). This segmentation resolves the contradiction by providing clear association rules for each mode while maintaining unified TCI framework efficiency.
Solution Approach 2:
The patent changes the parameter of beam indication clarity by introducing a new one-bit indicator parameter that switches between two clear association methods. When the indicator is set to 0, the association is clearly defined as MAC CE-based; when set to 1, the association is clearly defined as configuration information-based, eliminating the ambiguity in multi-TRP scenarios.
2Adaptability or versatility
If MAC CE is used for dynamic beam indication, then flexibility is improved, but complexity of beam association clarification increases
Solution Approach 1:
The patent applies dynamics by making the beam indication method switchable through a one-bit indicator. The system can dynamically select between MAC CE-based indication (for flexibility) and configuration information-based indication (for simplicity) depending on the indicator value, allowing the system to adapt to different operational requirements without fixed complexity.
Solution Approach 2:
The one-bit indicator serves as an intermediary that mediates between the two beam indication methods. It provides a simple control mechanism that switches between MAC CE-based flexible indication and configuration-based simple indication, reducing the overall complexity by providing a clear decision path rather than requiring complex simultaneous handling of both methods.
3Reliability
If configuration information is used for SRS transmission, then reliability is improved, but speed of beam indication response decreases
Solution Approach 1:
The patent establishes periodic action by defining specific conditions under which each indication method is used. MAC CE-based indication (indicator=0) provides fast periodic updates for dynamic beam adjustments, while configuration information-based indication (indicator=1) provides reliable but slower updates for stable beam configurations, allowing the system to alternate between speed and reliability based on operational needs.
Solution Approach 2:
The system dynamically adjusts the beam indication response speed and reliability trade-off through the one-bit indicator. When rapid response is needed, MAC CE-based indication provides fast updates; when maximum reliability is needed, configuration information-based indication ensures accurate beam association. This dynamic switching resolves the contradiction by allowing both modes to serve different operational requirements.
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by user equipment in a wireless communication system may comprise receiving, from a base station, configuration information including information enabling a unified transmission configuration indication (TCI) state for a sounding reference signal (SRS), information indicating that the unified TCI state is applied for the SRS, and information on an identity (ID) of a serving cell and an ID of a bandwidth part (BWP) which are referenced to apply the unified TCI state; receiving, from the base station, a medium access control (MAC) control element (CE) which includes a one-bit indicator and is for indicating the TCI state of the SRS; in case that a value of the indicator is a first value, transmitting the SRS to the base station based on the MAC CE indicating the ID of the serving cell and the ID of the BWP included in the configuration information; and in case that the value of the indicator is a second value, transmitting the SRS to the base station based on the configuration information.