Uplink Resource Indication Signaling in TDD Systems
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Solution Overview
Problem
In TDD systems, when the number of uplink subframes exceeds downlink subframes, uplink resource indication signals are transmitted in a single downlink subframe, causing mutual interference among users due to shared resource allocation, which affects system performance.
Innovation Solution
A method where a base station transmits uplink resource indication signaling and an uplink subframe indication signaling in a downlink subframe, using 1 or 2 bits to differentiate the uplink subframes, allowing users to transmit data in specific uplink subframes, thereby avoiding interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink resource indication signals for multiple uplink subframes are transmitted in one downlink subframe, then signaling efficiency is improved, but users of different uplink subframes transmit data at the same resource causing mutual interference
Solution Approach 1:
The patent segments the uplink resource indication signaling by introducing an uplink subframe indication signaling that divides the indication into separate parts: one part identifies the uplink subframe, and another part identifies the resource within that subframe. This segmentation allows multiple uplink subframes to be indicated in a single downlink subframe without causing interference, as each user can correctly identify which subframe their resource indication applies to.
Solution Approach 2:
The patent introduces an intermediary element called 'uplink subframe indication signaling' that acts as a mediator between the downlink resource indication and the actual uplink transmission. This intermediary provides the necessary context (which uplink subframe the resource indication refers to) without requiring separate downlink subframes for each uplink subframe, thus maintaining signaling efficiency while preventing interference.
2Quantity of substance
If uplink resource indication signaling is transmitted without uplink subframe indication, then signaling overhead is reduced, but users cannot determine the correct uplink subframe for data transmission
Solution Approach 1:
The patent merges the uplink resource indication signaling and the uplink subframe indication signaling into a single transmitted message from the base station. This combination allows the terminal to receive both pieces of information simultaneously without requiring separate transmissions, thereby maintaining low signaling overhead while ensuring complete information delivery for correct uplink subframe identification.
Solution Approach 2:
The patent applies preliminary action by providing the uplink subframe indication signaling together with the resource indication before the terminal needs to transmit data. This allows the terminal to pre-determine the correct uplink subframe and resource allocation, avoiding any ambiguity or information loss when the actual transmission occurs.
Data Source
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AI summary
A method for indicating an uplink resource is provided, including that: when a base station side transmits an uplink resource indication signaling in a downlink subframe, an uplink subframe indication signaling corresponding to the uplink resource indication signaling being transmitted together; and the uplink subframe indication signaling is used for indicating an uplink subframe used by a user side to transmit data according to the uplink resource indication signaling. A system for implementing the method is also provided, which can distinguish a resource indication signaling corresponding to different uplink subframes in the same downlink subframe, and avoid that all the users of different uplink subframes transmit the data in the same resource of the same uplink frame, thereby avoiding mutual interference between the users of the uplink subframes, ensuring system performance and resulting in less signaling overhead.