Enhanced Control Channel Resource Allocation for ACK/NACK Transmission
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Solution Overview
Problem
In wireless communication systems, especially in next-generation systems supporting high data rates, the existing control channels such as PDCCH and PHICH face challenges with resource insufficiency and interference due to increased terminal support and carrier aggregation, making it difficult to efficiently transmit ACK/NACK signals.
Innovation Solution
The introduction of enhanced control channels like E-PDCCH and E-PHICH, which can be configured in data regions and utilize specific search spaces, allowing for more flexible resource allocation and interference management, enabling effective ACK/NACK transmission across multiple cells and carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional control channels (PDCCH, PHICH) are used for ACK/NACK transmission, then the system can maintain compatibility with legacy terminals, but the radio resource becomes insufficient and interference increases when supporting more terminals and carrier aggregation
Solution Approach 1:
The patent divides the control channel resources into separate logical channels: PDCCH for downlink control information and a separate uplink control channel for ACK/NACK transmission. This segmentation allows independent resource allocation and management, preventing resource contention and interference between different control functions while supporting multiple terminals and carriers.
Solution Approach 2:
The patent introduces enhanced control channels (E-PDCCH, E-PHICH) that operate in additional frequency and time dimensions through carrier aggregation. By aggregating multiple component carriers, the system expands the control channel resource space beyond the single-carrier limitation, enabling sufficient ACK/NACK transmission capacity for large numbers of terminals without increasing interference on existing channels.
2Adaptability or versatility
If more terminals are supported by one base station through techniques like MTC and MU-MIMO, then terminal support capacity increases, but control channel resource insufficiency and interference worsen
Solution Approach 1:
The patent introduces enhanced control channels as intermediary structures that mediate between the increasing terminal support requirements and the limited control channel resources. These enhanced channels provide dedicated ACK/NACK transmission paths that isolate control signals from data channels and other control signals, reducing mutual interference while supporting expanded terminal capacity through MTC and MU-MIMO techniques.
3Productivity
If carrier aggregation is implemented to expand bandwidth to 20 MHz or higher, then data rate capability improves, but the complexity of determining ACK/NACK transmission resources increases
Solution Approach 1:
The patent changes the resource allocation parameters by defining specific mapping rules that relate ACK/NACK resources to uplink data channel resources. By establishing deterministic relationships between PUSCH resource allocations and corresponding ACK/NACK channel resources, the system simplifies resource determination in carrier aggregation scenarios, allowing terminals to automatically derive ACK/NACK transmission parameters from their uplink data allocations without complex network signaling.
Data Source
AI summary
The present invention provides a method for receiving acknowledgement/not-acknowledgement (ACK/NACK) of a terminal in a wireless communication system. The method transmits uplink data through an uplink data channel and receives ACK/NACK for the uplink data. The uplink data channel is transmitted through aggregated carriers and the aggregated carriers include a first band recognizable to first and second type terminals and a second band recognizable only to the second type terminal.