5G PDCCH Search Granularity Configuration for Power Reduction
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Solution Overview
Problem
In 5G New Radio (NR) systems, the increased flexibility in time domain location of the Physical Downlink Control Channel (PDCCH) for improved network resource allocation and reduced receiving delay leads to higher complexity and power consumption for terminal devices due to the need for blind detection across all symbols.
Innovation Solution
A method where a network device configures the terminal device with specific time domain configuration information to search for PDCCH, adjusting the search granularity based on service delay requirements, either increasing or decreasing the frequency of searches to optimize power consumption and complexity, using high-layer signaling or Downlink Control Information (DCI).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the terminal device searches for PDCCH on all symbols to improve flexibility and reduce receiving delay, then the receiving delay is reduced, but the complexity and power consumption of blind detection increase
Solution Approach 1:
The patent segments the time domain resources into multiple search spaces with different granularities. The terminal device is configured to search for PDCCH in specific symbols or symbol groups rather than all symbols, dividing the search space into manageable segments that reduce detection complexity while maintaining low delay performance.
Solution Approach 2:
The patent applies local quality by configuring different search granularities for different search spaces. Some search spaces may require finer granularity (more frequent searches) while others can use coarser granularity, allowing the terminal to optimize power consumption and complexity based on the specific requirements of different control channels.
2Loss of time
If the terminal device searches for PDCCH on all symbols to improve flexibility and reduce receiving delay, then the receiving delay is reduced, but the power consumption of blind detection increases
Solution Approach 1:
The patent segments the time domain resources into multiple search spaces with different granularities. The terminal device is configured to search for PDCCH in specific symbols or symbol groups rather than all symbols, dividing the search space into manageable segments that reduce detection complexity while maintaining low delay performance.
Solution Approach 2:
The patent implements periodic search actions with configurable granularities. The terminal device searches for PDCCH at predetermined intervals or in predetermined symbol groups rather than continuously, reducing power consumption while maintaining the ability to receive control information with minimal delay.
3Adaptability or versatility
If the network device increases the flexibility of time domain location of PDCCH, then the network resource allocation flexibility is improved, but the complexity of terminal device blind detection increases
Solution Approach 1:
The patent segments the time domain resources into multiple search spaces with different granularities. The terminal device is configured to search for PDCCH in specific symbols or symbol groups rather than all symbols, dividing the search space into manageable segments that reduce detection complexity while maintaining low delay performance.
Solution Approach 2:
The patent implements dynamic configuration of search spaces through higher layer signaling. The network device can dynamically adjust the search space configuration, including time domain location and granularity, based on current network conditions and service requirements, allowing flexible adaptation without requiring the terminal to continuously search all symbols.
Data Source
AI summary
A method for signal transmission, a network device and a terminal device are provided. The method includes: determining, by the network device, first configuration information, wherein the first configuration information is used for indicating a first time domain resource and a first time domain granularity corresponding to the first time domain resource, wherein the first time domain resource and the first time domain granularity are used for the terminal device to search for a downlink control channel on the first time domain resource by taking the first time domain granularity as a cycle; and transmitting, by the network device, the first configuration information to the terminal device.