OFDMA Shared Control Channel Message Format for Antenna Diversity
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Solution Overview
Problem
The conventional shared control channel message format in OFDMA wireless communication systems is not suitable for supporting various antenna technologies, including precoding, as it lacks information on the precoding used for data transmission, especially in systems using common pilots, and fails to detect technologies like SISO and STTD when precoding is not applied.
Innovation Solution
A method and apparatus for transmitting and receiving a shared control channel message that includes determining whether to apply precoding and transmitting control information using a TD-FLAM message type, which identifies the specific transmit diversity technologies used, such as SISO or STTD, allowing the receiver to demodulate data accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conventional shared control channel message format is used, then the system maintains simplicity in message structure, but it cannot support various antenna technologies including precoding and fails to detect SISO and STTD technologies
Solution Approach 1:
The control information is segmented into multiple fields including a transmit diversity field and a precoding field. The transmit diversity field specifically identifies the transmit diversity technology (SISO, STTD, etc.) while the precoding field indicates precoding application status. This segmentation allows the message format to support multiple antenna technologies through structured field division.
Solution Approach 2:
The message format is designed to be dynamic by including fields that can indicate different transmission modes. The transmit diversity field and precoding field can take different values to represent various antenna technologies and their application states, making the message format adaptable to different transmission scenarios without requiring multiple fixed formats.
2Productivity
If precoding is applied for data transmission, then transmission efficiency is improved, but the conventional message format cannot convey information about the precoding used
Solution Approach 1:
The message format includes a precoding field that provides feedback information about the precoding applied to data transmission. This field conveys information about whether precoding is used and which precoding technology is applied, enabling the receiver to properly process the transmitted data and maintain the benefits of precoding-based transmission efficiency.
3Measurement precision
If the message format includes detailed information on transmit diversity and precoding, then accurate detection of antenna technologies is achieved, but the message overhead increases
Solution Approach 1:
The patent extracts only the essential information needed for antenna technology detection into dedicated fields. The transmit diversity field extracts information about the transmit diversity technology type, and the precoding field extracts information about precoding application. This extraction approach provides accurate detection capability while keeping the message overhead minimal by including only necessary information.
Data Source
AI summary
A method and apparatus for transmitting/receiving a shared control channel message in an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system are provided. The message transmission apparatus receives feedback information from a terminal; determines whether to transmit data by applying preceding; and transmits, in the shared control channel message, control information whose message type is differently set according to the application of the preceding. The message reception apparatus receives the shared control channel message from a base station; determines a message type of the shared control channel message; and if the message type is a Transmit Diversity (TD)-Forward Link Assignment Message (FLAM), demodulates data by at least one of Single Input Single Output (SISO) and Spatial Time Transmit Diversity (STTD) as indicated by the TD-FLAM.