Network Device Search Space Determination for Carrier Scheduling
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Solution Overview
Problem
Current Coordinated Multiple Points Transmission/Reception (CoMP) technologies in LTE systems face inefficiencies and unreliability due to limited transmission of physical downlink control channels (PDCCHs) per subframe and delays in scheduling, leading to outdated channel state information and reduced information transmission efficiency.
Innovation Solution
A method to determine and utilize multiple downlink control channels across a single carrier, allowing for coordinated scheduling and transmission of PDCCHs by multiple base stations, enabling improved resource allocation and reliability through precise determination of search spaces and resource configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If only one PDCCH on one carrier is scheduled for a UE in one subframe, then the system maintains simple scheduling structure, but transmission efficiency becomes low
Solution Approach 1:
The patent divides the scheduling function into multiple PDCCH channels across different carriers. Instead of using a single PDCCH on one carrier, the system segments the control channel transmissions across multiple carriers (e.g., PDCCH on carrier 1, PDCCH on carrier 2), allowing parallel scheduling operations that improve transmission efficiency while maintaining manageable complexity through structured resource allocation.
Solution Approach 2:
The patent transitions from a single-dimension scheduling approach (one PDCCH on one carrier) to a multi-dimensional approach by introducing carrier frequency as an additional dimension. Multiple PDCCHs can now be scheduled across different carriers (frequency dimension) within the same subframe (time dimension), effectively utilizing the frequency-time resource space to improve transmission efficiency.
2Reliability
If multiple base stations perform independent scheduling with single PDCCH, then scheduling flexibility is maintained, but delay increases causing channel state information to become invalid
Solution Approach 1:
The patent implements preliminary action by enabling multiple base stations to prepare and transmit PDCCH scheduling information in advance across multiple carriers before the actual data transmission. This allows the UE to receive multiple scheduling opportunities, ensuring that up-to-date channel state information is available and reducing the time loss associated with waiting for a single scheduling decision.
Solution Approach 2:
The patent ensures continuity of useful action by allowing multiple PDCCH transmissions across multiple carriers within the same subframe. Instead of a single discrete scheduling event that may be delayed, the system provides continuous scheduling opportunities through multiple parallel PDCCH channels, ensuring that channel state information remains valid and up-to-date throughout the transmission process.
3Productivity
If multiple PDCCHs are transmitted across different carriers for one UE, then information transmission efficiency improves, but blind detection overhead increases
Solution Approach 1:
The patent applies local quality by optimizing the blind detection process for each carrier individually. Instead of uniformly increasing blind detection across all carriers, the system allows each carrier to have its own PDCCH transmission with localized detection parameters. This enables efficient blind detection by concentrating detection efforts on carriers where PDCCH transmissions are actually present, reducing overall detection overhead while maintaining high transmission efficiency.
Data Source
AI summary
Example channel transmission methods and apparatus are described. One example method includes determining search spaces of at least two downlink control channels by a first network device. The first network device separately determines in the search spaces resources occupied by the at least two downlink control channels. Resource scheduled by the at least two downlink control channels belong to one carrier. The first network device obtains the at least two downlink control channels by using the resources. With the embodiments of the present invention, data on one carrier can be scheduled through a plurality of downlink control channels.