CQI Multiplexing with Uplink Data in LTE
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Solution Overview
Problem
In LTE systems, the current method of transmitting Channel Quality Indicator (CQI) information is inefficient, as it often results in resource waste due to periodic transmission, even when there is no uplink data, and requires significant signaling overhead, especially for large amounts of CQI information.
Innovation Solution
A method is introduced to determine CQI transmission times based on the presence or absence of uplink data, using a CQI transmission-available interval, allowing CQI to be multiplexed with uplink data only when necessary, and transmitted or received accordingly, reducing resource allocation and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CQI is transmitted periodically regardless of uplink data presence, then channel quality information is continuously updated, but resource waste increases and signaling overhead increases
Solution Approach 1:
The patent applies dynamics by changing the CQI transmission pattern from static periodic transmission to dynamic transmission based on uplink data presence. The terminal determines whether to transmit CQI based on whether uplink data is transmitted in the current sub-frame, making the transmission behavior adaptive and flexible rather than fixed and rigid.
Solution Approach 2:
The patent uses periodic action by establishing a periodic CQI transmission opportunity based on the uplink data transmission periodicity. The CQI is transmitted periodically in sub-frames where uplink data is transmitted, maintaining the periodic nature of communication while optimizing resource utilization based on actual data traffic conditions.
2Ease of operation
If CQI is transmitted using dedicated control channel resources, then CQI can be transmitted independently, but resource allocation increases and signaling overhead increases
Solution Approach 1:
The patent applies merging by combining CQI transmission with uplink data transmission in the same physical uplink shared channel (PUSCH). Instead of using separate dedicated resources for CQI, the system merges control information (CQI) and data transmission, thereby reducing resource allocation requirements and signaling overhead while maintaining independent transmission capability.
Solution Approach 2:
The patent applies universality by making the PUSCH serve multiple functions: both data transmission and CQI transmission occur in the same channel. This multi-functional approach allows the system to reduce dedicated control channel resources while maintaining the ability to transmit CQI independently when needed.
3Loss of energy
If CQI is transmitted only when uplink data exists, then resource waste is reduced, but CQI transmission timing becomes dependent on data transmission
Solution Approach 1:
The patent applies dynamics by enabling the terminal to dynamically determine CQI transmission based on actual uplink data presence. The terminal has the flexibility to transmit CQI in sub-frames where uplink data is transmitted, while having the option to skip CQI transmission when no data is present, making the system adaptable to varying traffic conditions.
Data Source
AI summary
A method and apparatus for transmitting/receiving a Channel Quality Indicator (CQI) in a communication system are provided. It is determined whether there is any uplink data to transmit, when a CQI transmission time arrives according to a predetermined CQI transmission period. If there is uplink data to transmit, a part of the uplink data is punctured to insert the CQI therein, and the inserted CQI is multiplexed with the uplink data before transmission. It is determined whether there is any uplink data to receive from a terminal, when a CQI reception time arrives according to a predetermined CQI transmission period. If there is uplink data to receive, the uplink data is received from the terminal, and the received uplink data is demultiplexed to extract the CQI.