NB-IoT UE Channel Quality Information Transmission via NPUSCH
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting and receiving downlink channel quality information, particularly in random access procedures and radio resource control connected states, which affects resource allocation and energy efficiency.
Innovation Solution
A method and apparatus for efficiently transmitting channel quality information by a user equipment (UE) in a wireless communication system supporting NB-IoT, involving the transmission of a random access preamble, receiving a random access response, and transmitting channel quality information through a narrowband physical uplink shared channel, based on a narrowband physical downlink control channel order, using a UE-specific search space configured in the RRC connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel quality information is transmitted using traditional methods in random access procedures, then the transmission can be performed, but the resource allocation efficiency is low and energy consumption is high
Solution Approach 1:
The patent combines channel quality information transmission with the random access procedure by multiplexing the CQI report on the NPUSCH along with the message 3 transmission. This merging eliminates separate CQI reporting steps, improving resource allocation efficiency while reducing energy consumption through consolidated transmissions.
Solution Approach 2:
The NPUSCH channel is made multi-functional by allowing it to carry both uplink data (message 3) and channel quality information simultaneously. This universal usage of the same physical channel for multiple purposes optimizes resource utilization and reduces the need for dedicated CQI reporting resources.
2Measurement precision
If channel quality information is transmitted frequently to ensure accurate feedback, then the accuracy of channel state information is improved, but the signaling overhead and resource consumption increase
Solution Approach 1:
The patent merges CQI reporting with existing uplink data transmissions (message 3) in the random access procedure. By combining these signaling functions into a single NPUSCH transmission, the patent maintains accurate channel state feedback while minimizing additional signaling overhead.
3Reliability
If a dedicated physical channel is allocated for CQI reporting, then the channel quality information transmission is reliable, but the system complexity and resource overhead increase
Solution Approach 1:
The patent makes the NPUSCH channel universal by enabling it to carry both uplink data and CQI reporting functions. This eliminates the need for dedicated CQI reporting channels, reducing system complexity while maintaining transmission reliability through the established NPUSCH framework.
Solution Approach 2:
The existing NPUSCH infrastructure is made to serve dual purposes (data transmission and CQI reporting) without requiring additional dedicated channels. The system leverages its own existing channel capabilities to handle CQI reporting, avoiding the complexity of implementing separate dedicated reporting mechanisms.
Data Source
AI summary
The present invention relates to a method for transmitting and receiving channel quality information in a wireless communication system for supporting a Narrowband Internet of Things (NB-IoT) and a device therefor and, more particularly, the method comprising: transmitting and receiving a random access preamble; transmitting and receiving a random access response on the basis of the random access preamble; and transmitting and receiving channel quality information via a narrowband physical uplink shared channel (NPUSCH) on the basis of the random access response, wherein when the random access preamble is transmitted and received on the basis of a narrowband physical downlink control channel (NPDCCH) order in a radio resource control (RRC) connected state, the channel quality information is measured on the basis of a UE-specific search space (USS) set in the RRC connected state.