HARQ-ACK Codebook Generation for Dormant Secondary Cells
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Solution Overview
Problem
In wireless communication systems, existing technologies face challenges in efficiently generating and managing HARQ-ACK codebooks, particularly when dealing with scenarios involving deactivated or dormant secondary cells and bandwidth parts.
Innovation Solution
A method and device for a user equipment (UE) and a base station to effectively generate and transmit HARQ-ACK codebooks, by receiving information associated with cells, triggering codebook transmission, and transmitting codebooks that include HARQ-ACK information for both deactivated and activated secondary cells, using parameters configured for a reference bandwidth part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK codebook includes both activated and deactivated SCells, then reliability of communication is improved, but device complexity increases
Solution Approach 1:
The codebook is segmented into multiple parts, each corresponding to different SCell states (activated, deactivated, dormant). This segmentation allows the UE to systematically manage HARQ-ACK information for each cell state separately, reducing the complexity of tracking and managing codebooks for multiple SCells with different states while ensuring reliable acknowledgment for all cells.
Solution Approach 2:
The network configures the UE with codebook generation rules and parameters in advance through RRC signaling. This preliminary configuration enables the UE to automatically determine which SCells to include in the codebook based on their current states, eliminating the need for complex real-time decisions about codebook composition and reducing signaling overhead.
2Reliability
If HARQ-ACK codebook is generated for all SCells including deactivated ones, then completeness of acknowledgment is improved, but signaling overhead increases
Solution Approach 1:
The codebook dynamically adapts its composition based on the current state of each SCell. The UE determines which SCells to include in the codebook based on their activation status and dormancy state, rather than including all configured SCells. This dynamic approach ensures complete acknowledgment for all active cells while avoiding unnecessary signaling for deactivated cells, thus reducing overhead while maintaining completeness.
Solution Approach 2:
The system uses state parameters (activation status, dormancy state) to control codebook generation. By monitoring changes in these parameters, the UE can adjust the codebook content accordingly - including SCells when activated and excluding them when deactivated - thereby achieving complete acknowledgment only when necessary and minimizing signaling overhead.
3Measurement precision
If UE monitors all configured SCells for codebook generation, then accuracy of HARQ-ACK information is improved, but power consumption increases
Solution Approach 1:
The UE dynamically adjusts its monitoring behavior based on SCell states. It actively monitors SCells that are in an activated state to ensure accurate HARQ-ACK information, while reducing or suspending monitoring of deactivated SCells. This dynamic monitoring strategy maintains measurement precision for relevant cells while significantly reducing power consumption by avoiding unnecessary monitoring of inactive cells.
Solution Approach 2:
The UE autonomously determines which SCells require monitoring based on their current states and the codebook generation requirements. By self-managing the monitoring process according to cell activation status, the UE ensures accurate HARQ-ACK information is obtained only when necessary, avoiding wasteful power consumption from monitoring all configured SCells regardless of their state.
Data Source
AI summary
The disclosure provides a method for establishing and receiving a downlink control channel in a wireless communication system. A method performed by a terminal comprises, receiving, from a base station, information with at least one cell associated with a hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook transmission of the UE; receiving, from the base station, information triggering the HARQ-ACK codebook transmission; and transmitting, to the base station, a HARQ-ACK codebook including HARQ-ACK information associated with the at least one cell, respectively, wherein, in case that the at least one cell includes at least one of a deactivated secondary cell (SCell) or an activated SCell including an activated dormant bandwidth part (BWP), HARQ-ACK information associated with the deactivated SCell and HARQ-ACK information associated with the activated SCell including the activated dormant BWP is generated based on a parameter associated with a HARQ-ACK information generation, which is configured for reference BWP.