DCI Format Validity Indication Bits Overhead
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Solution Overview
Problem
The efficiency of using overhead resources for transmitting control information in LTE systems is low due to improper utilization of control bits in the DCI format, particularly in scenarios involving two codewords, leading to unnecessary resource overhead and reduced spectral efficiency.
Innovation Solution
The method involves modifying the DCI format by introducing validity indication bits to indicate the validity of transmission control for each transmission block, allowing for dynamic allocation of bits and reducing redundant information, thereby optimizing the use of resource overhead and supporting multiple transmission schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the DCI format includes fixed control bits for two codeword transmission, then the control information structure is simple and easy to decode, but the overhead efficiency is low when only one codeword is transmitted
Solution Approach 1:
The patent applies dynamics by making the control bit fields configurable rather than fixed. The network side device can dynamically adjust the DCI format to include only the necessary control bits for the actual transmission scenario (one or two codewords), allowing the overhead structure to adapt to changing transmission requirements while maintaining decoding simplicity through standardized configuration procedures
Solution Approach 2:
The patent changes the parameters of the DCI format by allowing the network to configure the presence and size of control bit fields (such as TB-to-CW swap flag, transmission block indicators) based on the actual transmission mode. This parameter flexibility enables the system to optimize overhead efficiency for single-codeword transmissions while preserving the capability for two-codeword transmissions when needed
2Adaptability or versatility
If redundant control bits are included in the DCI format to support multiple transmission modes, then the system has high adaptability to different transmission schemes, but the overhead for transmitting control information increases
Solution Approach 1:
The patent implements universality by designing a configurable DCI format that can serve multiple transmission modes (single-codeword and two-codeword transmissions) through a unified structure. The same DCI format template can be adapted to different scenarios by selectively enabling or disabling specific control bit fields, eliminating the need for separate specialized formats and reducing overall overhead while maintaining full adaptability
Solution Approach 2:
The patent segments the control information into modular fields (e.g., transmission block indicators, codeword swap flags, redundancy version bits) that can be independently configured. This segmentation allows the network to include only the necessary segments for the current transmission mode, reducing overhead while preserving the ability to include additional segments when multiple transmission schemes are required
Data Source
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AI summary
The present invention provides a method for sending and receiving control information, an apparatus and a communication system. The method for sending control information includes: setting respective control bits in a downlink control information (DCI) format to generate control information applied by a network side to a terminal, where the control bits include validity indication bits and transmission control bits, indication information indicating whether transmission control exercised by the network side on a transmission block is valid relative to the terminal is written into the validity indication bits, and the validity indication bits are located outside the transmission control bits; and sending the generated control information to the terminal. In the embodiments of the present invention, a network side device extends or changes functions of some control bits in the DCI format of the control information, so as to improve efficiency of using a resource overhead occupied by the control bits in the DCI format of the control information, and improve efficiency of using an overhead required for transmitting the control information.