Uplink ACK/NACK Transmission via Multi-Antenna Resource Mapping
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Solution Overview
Problem
In mobile communication systems using Orthogonal Frequency-Division Multiple Access (OFDMA), the efficiency of uplink resource allocation is compromised when multiple CCEs are allocated for Physical Downlink Control Channels (PDCCH), as only the first channel resource is utilized for ACK/NACK transmission, leading to resource wastage.
Innovation Solution
The method involves transmitting ACK/NACK information through a plurality of antennas, where channel resources are dynamically assigned to each slot, allowing multiple ACKCHs to be mapped to different CCEs, including those beyond the first CCE, thereby optimizing resource utilization by using Precoding Vector Switching (PVS) and antenna selection methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple CCEs are allocated for PDCCH, then control channel capacity is improved, but uplink resource utilization deteriorates because only the first channel resource is utilized for ACK/NACK transmission
Solution Approach 1:
The patent extends ACK/NACK transmission from a single channel resource (one-dimensional) to multiple channel resources corresponding to multiple CCEs (multi-dimensional). By mapping ACK/NACK information to multiple uplink channel resources associated with each allocated CCE, the system fully utilizes the control channel resources in the frequency domain, transforming the resource utilization pattern from scalar to vector-based allocation.
Solution Approach 2:
The patent segments the ACK/NACK transmission across multiple independent channel resources, each corresponding to a specific CCE. Instead of concentrating all ACK/NACK information in a single resource, the system divides the feedback information and transmits it through multiple segmented paths, allowing parallel utilization of all allocated control channel resources.
2Reliability
If multiple antennas are used for ACK/NACK transmission, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent makes the uplink transmission system multi-functional by enabling each antenna to handle multiple ACK/NACK information streams simultaneously. The system can dynamically assign different ACK/NACK feedbacks to different antennas based on channel conditions and resource availability, allowing the same physical infrastructure to serve multiple communication purposes without requiring dedicated transmission paths for each antenna.
Solution Approach 2:
The patent introduces dynamic resource allocation and antenna selection mechanisms that adapt to changing channel conditions. The system can dynamically determine which antennas to use for ACK/NACK transmission and how to map feedback information to specific antennas and channel resources, providing flexibility and adaptability without permanent structural modifications.
Data Source
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AI summary
A method for transmitting uplink acknowledgement information for a downlink data channel in a mobile communication system, the method comprising receiving a downlink control channel and a downlink data channel. Uplink acknowledgement information is generated for the received downlink data channel. At least two channel resources are identified for the uplink acknowledgement information. The uplink acknowledgement information is transmitted on the at least two channel resources through at least two transmission antennas. The at least two channel resources comprise a first channel resource and a second channel resource. The first channel resource for a first transmission antenna is identified based on a lowest CCE index of the downlink control channel, and the second channel resource for a second transmission antenna is identified based on a CCE index.