ACK/NACK Resource Allocation via Orthogonal Sequences
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Solution Overview
Problem
Current mobile communication systems, such as LTE, face inefficiencies in resource utilization and reception performance for ACK/NACK transmission, particularly in scenarios where HARQ is applied, due to overhead in signaling resource information and interference from multiplexing multiple users.
Innovation Solution
The method involves defining a detailed mapping relation between control channels and resources for ACK/NACK transmission, using a combination of Zadoff-Chu sequences and orthogonal sequences, to minimize overhead and optimize resource allocation, allowing for efficient ACK/NACK signal transmission by fixing cyclic shift values and orthogonal sequence indexes, and dynamically adjusting resource allocation based on channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple users are multiplexed on the same physical uplink control channel, then channel resource utilization is improved, but interference between users increases and reception performance deteriorates
Solution Approach 1:
The physical uplink control channel resources are segmented into multiple orthogonal sequences with different sequence indices. Each user is assigned a specific orthogonal sequence index, which divides the shared channel into orthogonal sub-channels, allowing multiple users to transmit simultaneously without mutual interference while maintaining high resource utilization
Solution Approach 2:
The system changes the sequence index parameter of orthogonal sequences to differentiate between multiple users. By dynamically assigning different sequence indices based on user equipment identifiers and downlink resource allocation, the system enables multiple users to share the same physical channel while maintaining orthogonality and avoiding interference
2Measurement precision
If detailed resource information is signaled to user equipment for ACK/NACK transmission, then transmission accuracy is improved, but signaling overhead increases
Solution Approach 1:
The user equipment autonomously determines its ACK/NACK transmission resources by independently calculating the orthogonal sequence index based on its own identifier and the downlink resource allocation information it has already received. This eliminates the need for the base station to explicitly signal the sequence index, reducing overhead while maintaining precise resource allocation
Solution Approach 2:
The downlink control information serves multiple functions: it not only conveys scheduling information but also enables the user equipment to derive ACK/NACK transmission parameters through predefined mapping relationships. This multi-functionality reduces the need for separate signaling messages, lowering overhead while maintaining transmission accuracy
Data Source
AI summary
A method and apparatus are provided for receiving acknowledgement information by a base station in a wireless communication system. The method includes transmitting configuration information for transmission of the uplink control information, the configuration information including information for identifying a first resource block (RB) to be used for the transmission; and receiving the uplink control information on a physical uplink control channel based on the configuration information.