MAC CE Pathloss RS Activation for SRS Delay Reduction
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Solution Overview
Problem
The existing methods for activating or updating pathloss Reference Signals (RSs) in Sounding Reference Signal (SRS) resource sets through Radio Resource Control (RRC) messages suffer from significant transmission delays, necessitating a more efficient approach.
Innovation Solution
The method involves using a Medium Access Control (MAC) Control Element (CE) to indicate the activation or updating of pathloss RSs, which includes SRS resource set and pathloss RS fields, allowing for quicker updates by reducing reliance on RRC messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If RRC messages are used to activate or update pathloss RSs in SRS resource sets, then configuration accuracy is maintained, but transmission delay increases significantly
Solution Approach 1:
The patent introduces MAC Control Elements (MAC CEs) as an intermediary mechanism between the RRC layer and the physical layer for activating or updating pathloss RSs. The MAC CE carries SRS resource set indicators and pathloss RS indicators that enable faster updates compared to traditional RRC messaging, while maintaining configuration accuracy through structured field definitions and validation procedures.
Solution Approach 2:
The patent segments the configuration update process into multiple independent fields within the MAC CE structure: SRS resource set indicators, pathloss RS indicators, and activation/update commands. This segmentation allows for efficient processing and reduces the overall message size and transmission time while maintaining the完整性 of the configuration information.
2Productivity
If RRC messages are used for pathloss RS activation, then comprehensive configuration control is achieved, but system productivity decreases
Solution Approach 1:
The patent changes the parameter of message type from RRC (higher layer, slower) to MAC CE (lower layer, faster) for pathloss RS activation. The MAC CE structure includes optimized fields such as SRS resource set indicators and pathloss RS indicators that enable quicker processing at the MAC layer, thereby improving configuration update speed while managing complexity through standardized field formats.
3Loss of time
If MAC CE is used to activate or update pathloss RSs, then transmission delay is reduced, but message structure complexity increases
Solution Approach 1:
The patent applies local quality by defining specific, targeted fields within the MAC CE structure that are relevant only to SRS pathloss RS activation. The MAC CE includes localized indicators for SRS resource sets and pathloss RSs, avoiding the need for comprehensive RRC-level configuration fields. This localized approach reduces the overall message size and processing complexity while maintaining the necessary functionality for fast updates.
Data Source
AI summary
Embodiments of the present application relate to a method for activating or updating a pathloss reference signal corresponding to a sounding reference signa and a device. The method includes: receiving, by a terminal device, a MAC CE sent by a network device, the MAC CE including at least one SRS resource set field and/or at least one pathloss RS field, the at least one SRS resource set field being used to indicate at least one SRS resource set, and the at least one pathloss RS field being used to indicate at least one pathloss RS corresponding to the at least one SRS resource set; and updating or activating, by the terminal device, the at least one pathloss RS corresponding to the at least one SRS resource set according to the MAC CE.