SRS Time Domain Bundling for Coverage Enhancement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in ensuring comprehensive SRS coverage for enhanced MIMO operation, particularly in high-density mobile broadband scenarios, where existing SRS transmission methods may not adequately support reliable channel quality measurements due to limited bandwidth allocation and intermittent SRS transmissions.
Innovation Solution
The implementation of SRS time domain bundling, where user equipment (UE) transmits SRS signals across multiple slots, either consecutively or non-consecutively, as configured by the base station, to improve channel quality measurements through repeated SRS transmissions, utilizing higher layer signaling, MAC control elements, or physical layer signaling to indicate the number of slots and bundling configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmissions are performed intermittently with limited bandwidth allocation, then device complexity and power consumption are reduced, but measurement precision and coverage reliability deteriorate
Solution Approach 1:
The patent implements periodic SRS transmissions across multiple slots with configured periodicity. The UE transmits SRS signals at regular intervals defined by time domain parameters, enabling the base station to perform channel quality measurements periodically. This periodic transmission pattern improves measurement reliability while controlling device complexity through standardized transmission rules.
Solution Approach 2:
The patent combines multiple SRS transmissions from different slots into a bundled resource set. By configuring SRS resource sets that span multiple slots with specific time domain parameters, the base station can aggregate channel quality information from multiple transmissions, improving overall measurement precision and coverage reliability.
2Reliability
If SRS transmissions are performed across multiple slots with bundling, then coverage reliability and measurement precision are improved, but loss of time and signaling overhead increase
Solution Approach 1:
The patent configures SRS resource sets with predetermined time domain parameters including periodicity, offset, and duration. These parameters are established in advance through RRC signaling, allowing the UE to prepare transmission timing ahead of time. This preliminary configuration reduces real-time decision complexity and enables efficient multi-slot transmissions without excessive signaling overhead during active communication.
3Measurement precision
If SRS transmissions are performed across multiple slots with bundling, then coverage reliability and measurement precision are improved, but signaling overhead increases
Solution Approach 1:
The patent uses higher layer signaling parameters (RRC configuration) to define SRS resource sets that serve multiple purposes: specifying time domain bundling parameters, frequency domain resources, and transmission periodicity simultaneously. This multi-functional configuration approach reduces the need for separate signaling messages for each parameter, minimizing overall signaling overhead while enabling precise multi-slot SRS transmissions.
Data Source
AI summary
Apparatuses, systems, and methods for sounding reference signal (SRS) coverage enhancement. A user equipment device (UE) may receive a configuration for SRS time domain bundling from a base station and may transmit, to the base station, at least one SRS transmission in accordance with the configuration. The configuration may include an indication of (and/or indicate) one or more SRS transmission occasions. The configuration may be communicated via higher layer signaling or physical layer signaling. The RRC parameter may be an SRS-ResourceSet parameter or an SRS-Resource parameter and may include a nrofSlots parameter to indicate the number of slots, where a slot may correspond to an SRS transmission occasion. The MAC CE may include at least four bits indicating the number of slots. The DCI may include at least one field indicating the number of slots.