Base Station Control Information Size Adjustment for MIMO
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Solution Overview
Problem
In 3GPP LTE-advanced systems, the frequent need for blind detection of multiple assignment control information formats and the inefficiency of zero-padding in adjusting control information sizes lead to increased circuit complexity and power loss, especially with MIMO and discontinuous allocation in uplink communication.
Innovation Solution
A configuration that adjusts the information size of downlink and uplink assignment control information based on the number of antenna ports and bandwidths in both the base station and terminal, allowing for single-blind detection and reducing unnecessary signal power, thereby preventing quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If zero-padding is performed to adjust the information size of assignment control information, then the size of downlink and uplink assignment control information becomes equal, but power is lost due to adding unnecessary zero information
Solution Approach 1:
The patent changes the information size parameter of assignment control information dynamically based on bandwidth configuration. Instead of using fixed-size formats with zero-padding, the system adjusts the information size to match the actual bandwidth requirements, eliminating unnecessary zero information and reducing power loss while maintaining size equality when needed.
2Adaptability or versatility
If multiple assignment control information formats are supported, then compatibility with different communication schemes is improved, but the number of blind detection times increases
Solution Approach 1:
The patent creates a universal assignment control information format that can adapt to different communication schemes (MIMO, discontinuous allocation, etc.) through parameter configuration rather than requiring separate formats. The base station configures the information size according to the active communication scheme, allowing the terminal to use a single blind detection process while maintaining compatibility with multiple schemes.
3Manufacturing precision
If information size of assignment control information is adjusted frequently, then size equality is maintained, but terminal circuit complexity increases
Solution Approach 1:
The patent performs size adjustment in advance through base station configuration messages rather than adjusting frequently during operation. The base station informs the terminal of the appropriate information size based on the configured bandwidth and communication scheme, allowing the terminal to prepare its reception parameters beforehand and reducing the need for complex real-time adjustment circuits.
Data Source
AI summary
Disclosed are a wireless base station, wireless terminal, and channel signal formation method that can prevent the quality of downstream assignment control data from degrading, while preventing the number of blind determinations from increasing on the wireless terminal on the receiving side of the downstream control channel signal. In a base station (100), a control unit (101) and a data size regulation unit (103) control the data size of downstream assignment control data and upstream assignment control data contained in the PDCCH signal based on the communication format used between the base station (100) and a terminal (200), the number of antennas (M) (nonnegative number) on the base station (100), the number of antennas (N) (nonnegative number) on the terminal (200), the bandwidth of the downstream band, and the bandwidth of the upstream band. Specifically, the control unit (101) determines it is unnecessary to adjust the aforementioned data size when the selected communication format is first established between multiple antennas and when where there are multiple for one of M and N and only one for the other.