ACK/NACK Resource Reservation for Uplink Control Channel Reliability
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Solution Overview
Problem
In LTE systems, there is a lack of specific methods for uplink control channel resource reservation and indication, which affects the reliability and efficiency of ACK/NACK feedback, especially for UE using transmit diversity.
Innovation Solution
The method involves configuring and notifying usable uplink control channel resources for ACK/NACK transmission, supporting transmit diversity, and improving the reliability of uplink control channel transmission by using ACK/NACK multiplexing or bundling with transmit diversity, and determining channel resource indexes based on CCE aggregation levels and RRC signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ACK/NACK feedback is transmitted using existing LTE Rel-8 methods with single PUCCH channel resource, then uplink single-carrier characteristic is maintained, but transmission reliability is insufficient for UE using transmit diversity
Solution Approach 1:
The patent segments the single PUCCH channel resource into multiple PUCCH channel resources, where each resource corresponds to a specific antenna port. This allows UE to transmit ACK/NACK feedback through multiple channels simultaneously, enhancing reliability for transmit diversity while maintaining clear resource mapping relationships.
Solution Approach 2:
The patent creates a universal resource configuration mechanism that works for both single-antenna and multi-antenna (transmit diversity) scenarios. The base station can configure multiple PUCCH resources based on CCE aggregation levels, making the system adaptable to different antenna configurations without requiring separate mechanisms.
2Reliability
If multiple PUCCH channel resources are configured for transmit diversity, then transmission reliability is improved, but resource configuration complexity increases
Solution Approach 1:
The base station performs preliminary configuration of multiple PUCCH channel resources before ACK/NACK transmission, associating each resource with specific CCE aggregation levels and antenna ports. This pre-configuration approach simplifies the actual transmission process, as UE only needs to select the appropriate pre-configured resource based on the scheduled CCE aggregation level.
Solution Approach 2:
The patent changes the parameter of PUCCH resource indexing by introducing a mapping relationship between CCE aggregation levels and PUCCH resource indices. Instead of complex multi-dimensional configuration, the system uses the CCE aggregation level as a key parameter to directly determine the PUCCH resource, simplifying configuration and selection.
3Reliability
If PUCCH resources are dynamically determined without reservation, then resource flexibility is maintained, but transmission reliability for ACK/NACK feedback is insufficient
Solution Approach 1:
The patent implements preliminary reservation of PUCCH channel resources by the base station, where resources are pre-configured and associated with specific CCE aggregation levels and antenna ports. This reservation mechanism ensures that reliable transmission resources are available before ACK/NACK feedback is generated, while maintaining operational simplicity through deterministic resource selection.
Data Source
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AI summary
A method, a system and an apparatus for ACK/NACK resource reservation are provided. The method includes: a base station configures and notifies usable uplink control channel resources to a user terminal using transmit diversity for ACK/NACK transmission, said base station receives the ACK/NACK transmitted by the said user terminal on the configured channel resources. The reservation of channel resource that is used in ACK/NACK feedback is realized, and the method for resource reservation supports transmit diversity, and improves the reliability of uplink control channel transmission, and the method is simple and easy to implement.