Dynamic Feedback Sequence Length for LTE Carrier Aggregation
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Solution Overview
Problem
In LTE carrier aggregation systems, the existing methods determine the length of ACK/NACK feedback information based on the number of configured component carriers, leading to redundant information transmission, which consumes higher power and resources, degrading transmission performance and resource utilization.
Innovation Solution
A method where a User Equipment (UE) receives an indicator from the network to determine the length of feedback information, allowing it to transmit a sequence of feedback information in a Physical Uplink Control Channel (PUCCH) with reduced redundancy, using a format with the least capacity to improve demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the length of feedback information sequence is determined according to the number of configured component carriers, then the eNB can maintain a consistent understanding of feedback information length, but there will be a large amount of redundant information transmitted when fewer carriers are actually activated or scheduled
Solution Approach 1:
The patent applies dynamics by making the feedback information sequence length adjustable rather than fixed. The network device dynamically configures the feedback information sequence length parameter to match the actual number of activated carriers, allowing the system to adapt between maintaining consistency (when all carriers are active) and reducing redundancy (when fewer carriers are active), thus resolving the contradiction between reliability and energy loss
Solution Approach 2:
The patent changes the parameter of feedback information sequence length from a fixed value based on configured carriers to a configurable value that reflects actual activated carriers. By introducing a configurable parameter that the network device can adjust, the system optimizes the balance between maintaining consistent understanding (reliability) and minimizing redundant transmission (energy consumption)
2Device complexity
If the length of feedback information sequence is determined according to the number of configured component carriers, then the feedback information structure remains simple and consistent, but physical resources and transmit power are wasted due to redundant information
Solution Approach 1:
The patent makes the feedback information structure dynamically configurable by introducing a configurable sequence length parameter. This allows the structure to remain simple and consistent when needed (when all carriers are active) while reducing the quantity of transmitted information when fewer carriers are active, thus resolving the contradiction between structural simplicity and resource consumption
Solution Approach 2:
The patent changes the feedback information structure parameter from fixed to configurable, allowing the network device to adjust the sequence length to match actual transmission needs. This parameter change enables the system to maintain structural simplicity when appropriate while minimizing physical resource consumption by eliminating redundant feedback information
3Adaptability or versatility
If a large number of component carriers are configured but only a small number are activated or scheduled, then the system supports high carrier aggregation capability, but the amount of redundant feedback information increases significantly
Solution Approach 1:
The patent extracts only the necessary feedback information corresponding to actually activated and scheduled carriers, rather than transmitting feedback for all configured carriers. By separating and transmitting only the relevant feedback bits, the system maintains high carrier aggregation capability while eliminating redundant information transmission
Solution Approach 2:
The patent changes the feedback information length parameter to reflect only the number of activated carriers rather than configured carriers. This parameter adjustment allows the system to support high carrier aggregation capability (when needed) while minimizing redundant information transmission by matching the feedback length to actual transmission requirements
Data Source
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AI summary
Disclosed are a method and device for sending and controlling feedback information, which are used to reduce redundant information in a feedback information sequence so as to decrease transmit power required for feedback information, save required physical resources, improve transmission performance of the feedback information and increase the resource utilization rate of the entire system. A method for sending feedback information provided in the present application comprises: a user equipment (UE) receives indication information sent by a network side and used for indicating a feedback information sequence length; the UE determines a feedback information sequence according to the feedback information sequence length indicated in the indication information; and the UE sends the determined feedback information sequence to the network side.