Subframe Bundle PDCCH Transmission for Wireless Resource Efficiency
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Solution Overview
Problem
The increasing number of user equipments (UEs) and the corresponding data and control information in wireless communication systems pose a challenge due to limited resources, necessitating an efficient method for transmitting and receiving uplink/downlink data and control information using limited radio resources.
Innovation Solution
A method and apparatus for a user equipment (UE) to repetitively receive and transmit a physical downlink control channel (PDCCH) during a first subframe bundle, with the transmission of a physical downlink shared channel (PDSCH) starting from a subframe n+k, where k is an integer greater than 0, and information about the transmission period and bundle size being communicated to the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of user equipments (UEs) and data/control information increases, then the communication service quality improves, but the limited radio resources become insufficient
Solution Approach 1:
The patent combines multiple subframes into a subframe bundle for joint PDCCH transmission. Instead of transmitting control channels in individual subframes, the base station aggregates control information across multiple subframes (e.g., 2-4 subframes) and transmits them together, thereby reducing the frequency of control channel transmissions and conserving radio resources while maintaining service quality for multiple UEs.
Solution Approach 2:
The patent implements periodic PDCCH transmission within subframe bundles. The base station transmits PDCCH at regular intervals (e.g., every other subframe or at specific positions within a bundle) rather than continuously in every subframe. This periodic approach reduces control channel overhead and allows more efficient utilization of limited radio resources while ensuring timely delivery of control information.
2Reliability
If PDCCH is transmitted frequently to ensure reliable control information delivery, then the reliability improves, but the loss of radio resources increases
Solution Approach 1:
The patent merges PDCCH transmissions across multiple subframes into unified subframe bundles. By combining control information that would otherwise be transmitted separately in each subframe, the system achieves reliable control delivery through redundancy and diversity while reducing the total number of transmissions required, thereby conserving radio energy and resources.
Solution Approach 2:
The patent uses copying of control information across multiple subframes within a bundle. The same or redundant control information is transmitted in different subframes, providing reliability through multiple copies. This approach ensures that UEs can reliably receive control information even if some transmissions are lost, while the bundled structure optimizes resource usage compared to independent transmissions.
3Productivity
If subframe bundling is implemented to reduce control channel overhead, then the resource efficiency improves, but the device complexity increases
Solution Approach 1:
The patent segments the downlink transmission into distinct subframe bundles with clear boundaries and structures. Each bundle contains a specific number of subframes with defined PDCCH transmission positions. This segmentation approach simplifies the complexity by creating manageable, standardized units that UEs can process systematically, rather than requiring complex continuous processing of individual subframes.
Solution Approach 2:
The patent introduces dynamic parameters for subframe bundling, such as configurable bundle sizes, transmission periods, and offsets that can be adapted to different traffic conditions and UE requirements. This dynamic configuration allows the system to optimize resource efficiency while providing flexibility in complexity management, enabling UEs to adjust their processing based on actual transmission patterns rather than requiring maximum complexity in all cases.
Data Source
AI summary
The present invention provides: a base station for repeatedly transmitting a physical downlink control channel (PDCCH) during a first subframe bundle comprising a plurality of subframes, and transmitting a PDSCH related to the PDCCH; and user equipment for receiving the PDCCH and the PDSCH. The PDSCH can be transmitted to the user equipment starting from subframe n+k, which is the kth subframe after the last subframe n−1 in the first subframe bundle, wherein k is an integer bigger than 0. The first subframe bundle may begin from a predetermined or fixed position.