LTE Terminal HARQ Resource Allocation via Subframe Configuration
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Solution Overview
Problem
The limitation of the PDCCH being transmitted in association with the cell-specific reference signal restricts the common search space to a single subframe, leading to inefficient control information notification and reduced transmission efficiency in LTE communication systems.
Innovation Solution
A terminal and base station communication system that determines specific subframes for transmitting HARQ response information using arithmetic operations based on initial and higher-layer set values for uplink control channels, allowing flexible resource allocation and subframe configuration to improve transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PDCCH is transmitted in association with the cell-specific reference signal, then the control information can be notified to the terminal, but the common search space is limited to a single subframe, reducing transmission efficiency
Solution Approach 1:
The patent segments the control information notification across multiple subframes by introducing a first search space that can be configured in multiple downlink subframes, rather than being limited to a single subframe. This allows the PDCCH to be transmitted in association with cell-specific reference signals across multiple subframes, improving transmission efficiency while maintaining reliable control information delivery.
Solution Approach 2:
The patent makes the search space configuration dynamic by allowing the base station to configure the first search space to be present in multiple downlink subframes based on higher layer signaling. This dynamic configuration enables flexible adaptation to different transmission scenarios, improving transmission efficiency without compromising control information reliability.
2Device complexity
If the common search space is limited to a single subframe, then the structure is simple, but the transmission efficiency deteriorates significantly
Solution Approach 1:
The patent applies preliminary action by configuring the first search space in multiple downlink subframes in advance through higher layer signaling, allowing the terminal to prepare for receiving control information across multiple subframes. This pre-configuration enables efficient multi-subframe operation without significantly increasing terminal complexity.
Solution Approach 2:
The patent changes the parameter of search space configuration from a single subframe limitation to multiple subframes by introducing configurable parameters that allow the base station to specify which downlink subframes contain the first search space. This parameter change enables flexible expansion of search space coverage while maintaining manageable system complexity.
3Reliability
If the PDCCH is transmitted only in association with cell-specific reference signal, then the association is clear, but the resource allocation flexibility is reduced
Solution Approach 1:
The patent applies universality by making the first search space serve multiple functions: it can be configured in different downlink subframes, and the base station can control its presence through higher layer signaling. This multi-functional design allows the same search space mechanism to adapt to various resource allocation scenarios while maintaining clear association with cell-specific reference signals.
Solution Approach 2:
The patent introduces higher layer signaling as an intermediary mechanism that enables flexible control of the first search space configuration. This intermediary allows the base station to dynamically adjust resource allocation by controlling whether the first search space is present in specific downlink subframes, while maintaining the clear association between PDCCH and cell-specific reference signals.
Data Source
AI summary
A terminal includes a transmission unit which transmits HARQ response information to transmission of a downlink-shared channel in one or more predetermined subframes based on resources of one or more uplink control channels. When a certain subframe in the predetermined subframes is a first subframe, a resource of an uplink control channel is given by an arithmetic operation using at least an initial value of a control channel element for use in transmitting a physical downlink control channel in the certain subframe and a first value configured by a higher layer. When a certain subframe in the predetermined subframes is a second subframe, a resource of an uplink control channel is given by an arithmetic operation using at least an initial value of a control channel element for use in transmitting a physical downlink control channel in the certain subframe and a second value configured by a higher layer.