Base Station Response Information Group Arrangement
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Solution Overview
Problem
In wireless communication systems, mobile station devices limited to specific subbands may not receive HARQ indicator channels when they are arranged in subbands they cannot use, and devices capable of using multiple subbands may not know where the HARQ indicator channels are located.
Innovation Solution
A wireless communication system where the base station allocates subbands for both uplink and downlink and transmits response information, using a control unit to manage the arrangement of response information groups and a multiplexing unit to configure these groups for transmission in allocated subbands, allowing mobile stations to recognize and decode the response information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station transmits HARQ indicator channels in all downlink subbands, then the response information coverage is improved, but the device complexity and resource overhead increase
Solution Approach 1:
The downlink frequency band is divided into multiple subbands, and HARQ indicator channels are selectively transmitted only in subbands that correspond to uplink subbands allocated to mobile stations. This segmentation approach ensures that each mobile station receives response information in subbands it can properly decode, improving reliability without requiring devices to monitor all downlink subbands, thus reducing device complexity.
2Productivity
If the base station allocates multiple subbands to a mobile station, then the communication capacity is improved, but the difficulty of detecting and measuring response information increases
Solution Approach 1:
The base station transmits HARQ indicator channels with specific local quality characteristics in subbands that match the mobile station's uplink subband allocations. Mobile stations only need to detect and measure response information in their allocated subbands, where the signal quality is optimized for their reception capabilities. This local quality approach allows multiple subband allocation for high capacity while keeping detection difficulty manageable by limiting the search space to relevant subbands only.
Data Source
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AI summary
A base station device, which allocates one or more subbands of each of an uplink and a downlink to a mobile station device and transmits response information, which indicates whether or not uplink data from the mobile station device has been properly received, to the mobile station device, the base station device includes: a control unit (11) which controls an arrangement of a response information group including multiple pieces of response information directed to a downlink subband allocated to the mobile station device; and a multiplexing unit (160) which collects the same type of multiple pieces of response information to configure the response information group, and arranges the configured response information group in the downlink subband based on the control of the control unit.