Pilot Symbol Position Determination for Uplink sTTI

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication technologies face high bit overhead in Downlink Control Information (DCI) when determining pilot symbol positions, particularly in scenarios requiring shorter time delays for applications like online games and virtual reality, due to the need to indicate relative distances between pilot symbols and shortened Transmission Time Intervals (sTTIs).

Innovation Solution

A method is introduced to determine pilot symbol positions by establishing a pattern of candidate positions pre-agreed between user equipment (UE) and base station, where the base station transmits an uplink grant with position indication information, allowing the UE to select suitable pilot symbol positions without needing to indicate relative distances, thereby reducing DCI bit overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the base station indicates the relative distance between pilot symbol and sTTI in DCI, then the UE can determine pilot symbol position, but the bit overhead of DCI becomes large

Engineering Contradiction:

Improvepilot symbol position determinationVSAvoidDCI bit overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent applies preliminary action by pre-defining multiple candidate pilot symbol position patterns before actual transmission. The UE and base station agree on these patterns in advance, so when the UE needs to determine pilot position, it only needs to receive a compact pattern index and sTTI position indication rather than full position details, significantly reducing DCI bit overhead while maintaining accurate position determination

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of the base station directly indicating the absolute pilot symbol position in DCI (which would require many bits), the patent inverts the approach by having the base station indicate a compact pattern index that refers to pre-agreed position patterns. This inversion transforms a high-bit overhead solution into a low-bit overhead solution while achieving the same position determination function

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS10237033B2Method for determining pilot symbol position, user equipment and base station

Publication Date: 2019.03.19 BEIJING SPREADTRUM HI TECH COMM TECH CO LTD

AI summary

A method for determining pilot symbol position, a user equipment and a base station, the method includes: determining a pattern of candidate pilot symbol positions for an uplink sTTI (shortened Transmission Time Interval) transmission in an uplink sub-frame; receiving an uplink grant from a base station, where the uplink grant is used to schedule the uplink sTTI transmission; and determining at least one pilot symbol position for an uplink sTTI based on the pattern of candidate pilot symbol positions and position indication information in the uplink grant. Technical solutions of the present disclosure can reduce bit overhead in a process of determining pilot symbol position.