Uplink Control Information Sorting for Carrier Activation
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Solution Overview
Problem
In LTE-A systems, the existing method for transmitting uplink control information causes the eNB to incorrectly decode jointly coded UCI due to inconsistent understanding between the UE and eNB regarding the total number of original information bits of UCI joint coding across multiple downlink carriers.
Innovation Solution
The UE sorts and transmits UCI for multiple downlink carriers based on a preset sorting rule, updating the activated carrier set according to carrier activation or deactivation commands, and performs channel coding based on the number of bits after channel coding, ensuring consistent understanding with the eNB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits UCI for multiple downlink carriers using joint channel coding, then the transmission efficiency is improved, but the eNB cannot correctly decode the UCI due to inconsistent understanding of the total number of original information bits
Solution Approach 1:
The patent applies preliminary action by having the UE sort the UCI pieces in a predetermined order before transmission. This sorting is done in advance based on carrier indices, ensuring that both the UE and eNB can independently determine the correct mapping between sorted UCI positions and corresponding carriers without requiring additional signaling about the total bit count.
Solution Approach 2:
The patent implements feedback by establishing a deterministic sorting rule that both the UE and eNB can independently apply. The eNB uses the same sorting criterion (carrier index order) to reconstruct the original UCI sequence, creating a feedback loop where the sorting rule itself serves as the synchronization mechanism without requiring explicit feedback about bit counts.
2Adaptability or versatility
If the UE updates the activated carrier set dynamically according to carrier activation/deactivation commands, then the system adaptability is improved, but the consistency between UE and eNB understanding of UCI bit count deteriorates
Solution Approach 1:
The patent applies preliminary action by establishing a predetermined sorting rule based on carrier indices before dynamic carrier activation/deactivation occurs. This pre-defined ordering mechanism remains valid regardless of which carriers are currently activated, allowing the UE to sort UCI pieces consistently even as the carrier set changes dynamically.
Solution Approach 2:
The patent uses parameter changes by allowing the activated carrier set to change dynamically while maintaining the same sorting criterion (carrier index order). The sorting rule adapts to the current activated carriers by selecting only those carriers that are currently activated, but the fundamental sorting mechanism remains unchanged, preserving consistency between UE and eNB.
Data Source
AI summary
The disclosure discloses a method for transmitting uplink control information. The method includes: receiving, by a user equipment, a carrier activation command or a carrier deactivation command in a downlink subframe n; updating a first downlink activated carrier set according to the received carrier activation command or the carrier deactivation command into a second downlink activated carrier set; taking the second downlink activated carrier set as a current downlink activated carrier set corresponding to a first uplink subframe which belongs to a subframe set of an uplink subframe n+k and uplink subframe(s) after the uplink subframe n+k; sorting X piece(s) of Uplink Control Information (UCI) corresponding to X downlink carrier(s) according to a sorting rule, and transmitting the sorted X pieces of UCI to a base station in the first uplink subframe.