Dedicated Pilot Resource Allocation for Channel Estimation

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Solution Overview

Problem

In wireless communication systems, users in poor channel status experience degraded channel estimation performance due to low pilot Signal-to-Interference and Noise Ratio (SINR), which affects system reception performance despite increased data SINR from using low Modulation and Coding Schemes (MCS) levels.

Innovation Solution

The method involves controlling the transmission and reception of dedicated pilots, where the amount of resources for dedicated pilots is determined in inverse proportion to the MCS level, allowing these pilots to be mapped to part of the resources allocated to the data channel, thereby improving channel estimation performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If low MCS level is used to increase data SINR for users in poor channel status, then data transmission reliability is improved, but channel estimation performance deteriorates due to low pilot SINR

Engineering Contradiction:
Improvedata transmission reliabilityVSAvoidchannel estimation performance
Core Design Contradiction:
ReliabilityVSMeasurement precision

Solution Approach 1:

The patent applies local quality by differentiating pilot resource allocation based on user-specific channel conditions and MCS levels. Users in poor channel status with low MCS levels receive enhanced dedicated pilot resources, while users in good channel status use standard common pilot allocation. This localized adaptation resolves the contradiction by improving channel estimation quality specifically where needed without affecting overall system efficiency.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent implements dynamic pilot resource allocation where the amount of dedicated pilot resources is adjusted according to the MCS level. When MCS level is low (indicating poor channel status), more pilot resources are allocated; when MCS level is high, standard allocation suffices. This dynamic adjustment allows the system to adaptively resolve the contradiction between data reliability and channel estimation performance based on real-time channel conditions.

Inventive Principle:
Principle #15Dynamics

2Measurement precision

If more resources are allocated to dedicated pilots for low MCS level users, then channel estimation performance is improved, but data transmission resources are reduced

Engineering Contradiction:
Improvechannel estimation performanceVSAvoiddata transmission rate
Core Design Contradiction:
Measurement precisionVSProductivity

Solution Approach 1:

The patent changes the parameter of pilot resource allocation based on the MCS level parameter. By establishing a relationship where pilot resources are adjusted according to MCS level, the system optimizes the trade-off between channel estimation accuracy and data transmission capacity. Low MCS users receive more pilots to improve their channel estimation, while high MCS users maintain standard allocation to preserve data rate, thus resolving the contradiction through parameter-based adaptation.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent applies local quality by providing enhanced pilot resources only to specific users with low MCS levels rather than uniformly increasing pilot allocation for all users. This selective approach improves channel estimation performance where needed while minimizing the impact on overall system productivity, as only a subset of users experiences resource reallocation.

Inventive Principle:
Principle #3Local quality

3Device complexity

If common pilots are used for all users, then system complexity is reduced, but channel estimation accuracy deteriorates for users in poor channel status

Engineering Contradiction:
Improvepilot allocation complexityVSAvoidchannel estimation accuracy
Core Design Contradiction:
Device complexityVSMeasurement precision

Solution Approach 1:

The patent segments the pilot allocation mechanism into two parts: common pilots for all users and dedicated pilots for specific users with low MCS levels. This segmentation allows the system to maintain simple common pilot allocation for most users while providing enhanced dedicated pilots only where needed, thus resolving the contradiction between system complexity and channel estimation accuracy through differentiated allocation strategies.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentUS8705496B2Method and apparatus for controlling transmission and reception of dedicated pilots according to MCS level in a wireless communication system
Publication Date: 2014.04.22 SAMSUNG ELECTRONICS CO LTD
  • US8705496B2 patent drawing
  • US8705496B2 patent drawing
  • US8705496B2 patent drawing

AI summary

A method and apparatus for controlling transmission and reception of dedicated pilots according to an MCS level in a wireless communication system are provided, in which an MCS level is determined for a data channel, the amount of resources for sending dedicated pilots is determined in inverse proportion to the MCS level, a pilot channel signal including basic pilots mapped to resources allocated to a pilot channel, a control channel signal including control information mapped to resources allocated to a control channel, and a data channel signal including the dedicated pilots mapped to the determined amount of resources being part of resources allocated to the data channel and data mapped to the remaining of the resources allocated to the data channel are generated, and the pilot channel signal, the control channel signal, and the data channel signal are multiplexed and sent in the mapped resources.