Reverse Link Channel Allocation for Control Information
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Solution Overview
Problem
Current wireless communication systems face challenges in ensuring high reliability and efficient transmission of control information bits, particularly ACK/NACK signals, over multiple physical channels in orthogonal frequency division multiple access (OFDMA) and single carrier frequency division multiple access (SC-FDMA) systems, due to limitations in channel allocation and peak-to-average power ratio (PAPR) management.
Innovation Solution
The system allows for the selection and use of multiple allocated channels for transmitting control information bits, using a combination of coherent and non-coherent communication methods, where log2(M) information bits select one of M physical channels, and the remaining bits determine the modulation symbol for the selected channel, thereby optimizing channel utilization and reducing PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple physical channels are allocated for control information transmission, then transmission reliability is improved, but peak-to-average power ratio increases
Solution Approach 1:
The control information bits are segmented into two groups: log2(M) bits for channel selection and remaining bits for modulation symbols. This segmentation allows the system to distribute information across multiple channels while controlling PAPR by separating the channel selection function from the data transmission function.
Solution Approach 2:
The system dynamically selects which physical channel to use based on the control information bits, rather than statically assigning channels. This dynamic channel selection allows flexible adaptation to different transmission conditions while managing PAPR through the structured bit allocation scheme.
2Productivity
If channel allocation is made flexible for different control information, then transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal channel allocation mechanism that can handle different types of control information (ACK/NACK, CQI, SRI) using the same structured approach. The log2(M) bits for channel selection and remaining bits for modulation works consistently across different control information types, reducing the need for separate handling procedures.
Solution Approach 2:
The system changes parameters (channel selection, modulation type) based on the control information bits in a systematic way. By using the first log2(M) bits to select channels and the remaining bits to determine modulation symbols, the system efficiently adapts transmission parameters without requiring complex decision logic.
Data Source
AI summary
A transmission of information from a secondary to a primary node occurs in a plurality of N logical time durations. The transmission from the secondary to primary node in a wireless network is performed by first receiving an allocation of M>1 reverse link channels for transmission of N>0 information elements. N information elements are produced. A group of K (possibly only one) reverse link channels is selected from the M allocated reverse link channels, using at least one of the N produced information elements, wherein the group of K reverse link channels comprises at least one channel, such that 0<K<M. A signal is produced using the produced information elements and the produced signal is transmitted on the selected group of K reverse link channels. Embodiments of the invention apply to transmission of ACKNAK and SRI.