SRS Resource Region Overlap in Multi-Connectivity Wireless Systems
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Solution Overview
Problem
In a multi-connectivity mode where a user equipment (UE) is connected to two or more small cells, there is a challenge in transmitting sounding reference signals (SRS) due to overlapping resource regions and non-ideal backhaul connections, leading to difficulties in sharing data and scheduling information.
Innovation Solution
The method involves a UE receiving control signals for aperiodic SRS transmission, checking for overlaps between SRS resource regions of different small cells, and selecting one SRS transmission based on predetermined conditions, such as physical cell identifiers, to prevent collisions and optimize power ratio, while pre-assigning resource regions for SRS transmission to avoid overlaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a UE transmits SRS to multiple small cells simultaneously in multi-connectivity mode, then channel quality measurement capability is improved, but resource region overlap and transmission collision occur
Solution Approach 1:
The patent segments SRS resource regions by associating each resource with a specific small cell identifier. When a UE is connected to multiple small cells, each cell is assigned distinct SRS resource regions, preventing overlap and collision while enabling separate channel quality measurements for each cell connection.
2Adaptability or versatility
If SRS resource regions are dynamically allocated for each small cell, then transmission flexibility is improved, but resource region overlap and collision increase
Solution Approach 1:
The patent applies preliminary action by pre-assigning distinct SRS resource regions to each small cell before the UE performs SRS transmission. This advance allocation ensures that resource regions do not overlap, eliminating collision issues while maintaining the flexibility to serve multiple small cells simultaneously.
Data Source
AI summary
The present invention provides methods for transmitting a sounding reference signal (SRS) in a wireless access system supporting a multiple connection mode, in which user equipment is connected to two or more small cells, and devices for supporting same. According to one embodiment of the present invention, the method for the user equipment transmitting the SRS in the wireless access system supporting the multiple connection mode, comprises the steps of: receiving, from a first small cell in the multiple connection mode, a control signal requesting an aperiodic SRS transmission; and confirming whether a first SRS resource region for the aperiodic SRS transmission to the first small cell and a second SRS resource region for a periodic SRS transmission to a second small cell in the multiple connection mode overlap, wherein the user equipment in the multiple connection mode maintains multiple connections with the two or more small cells, including the first small cell and the second small cell, and wherein the first small cell and the second small cell can be mutually connected through a non-ideal backhaul link.