Variable CC Identification Bits for Wireless Control Overhead
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Solution Overview
Problem
In wireless communication systems using multiple Component Carriers (CCs), existing methods face challenges in efficiently transmitting and receiving control information, such as downlink assignment and uplink grant, due to the need for additional bits to identify the correct CC, leading to increased overhead and compatibility issues with existing systems.
Innovation Solution
The proposed solution involves generating identification information using 0 to m bits to indicate the corresponding CC for control information, which is then added to the control channel, allowing for efficient transmission and reception of control information across multiple CCs, with the option to reduce additional bits to 0, 1, or 2 bits to minimize overhead and maintain backward compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional bits are added to control information to identify the correct Component Carrier, then the ability to transmit control information across multiple CCs is improved, but the overhead of the control channel increases
Solution Approach 1:
The patent applies dynamics by making the number of identification bits variable rather than fixed. The system dynamically adjusts the number of bits (0 to m bits) based on the specific CC identification requirements, allowing flexibility in adapting to different scenarios while minimizing overhead when full identification capability is not needed.
Solution Approach 2:
The patent changes the parameter of identification bit length from a fixed value to a variable parameter ranging from 0 to m bits. This parameter change enables the system to optimize between identification capability and overhead by selecting the appropriate bit length for each control information transmission scenario.
2Device complexity
If a fixed number of bits is used for CC identification, then the system structure is simplified, but compatibility with systems using different numbers of CCs is reduced
Solution Approach 1:
The patent achieves universality by designing a control information structure that can function across multiple CC configurations. By allowing the identification field to vary from 0 to m bits, the same basic structure can accommodate systems with different numbers of Component Carriers, making it compatible with both existing and future system configurations.
Solution Approach 2:
The patent uses dynamics to resolve the contradiction between simplified structure and compatibility. Rather than fixing the bit length, the system dynamically adapts the identification field size based on the number of CCs being used, maintaining structural simplicity while achieving broad compatibility through flexible parameter adjustment.
Data Source
AI summary
Disclosed are apparatuses and methods for transmitting and receiving control information, such as downlink assignment and uplink grant, to each CC through a DCI format of a PDCCH in a wireless communication system using a plurality of CCs. Exemplary embodiments include configuration and transmission of a CC indicator for the DCI format, in order to identify a CC to which the control information transferred by each DCI format corresponds from among the CCs.