Preemption Indicators for Dynamic TDD Control Channel Decoding
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting and receiving downlink control channels, particularly in dynamic TDD systems where the allocation of OFDM symbols for uplink and downlink varies based on traffic direction, requiring improved methods for resource management.
Innovation Solution
A preemption indicator is introduced to indicate preempted resources, dividing OFDM symbols into groups and classifying them as uplink, downlink, or flexible symbols, allowing terminals to efficiently decode data based on these indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD is used to vary the number of OFDM symbols for uplink/downlink based on traffic direction, then spectral efficiency is improved, but device complexity increases due to the need for dynamic resource allocation and preemption indication
Solution Approach 1:
The patent segments the downlink control channel into multiple parts: a first downlink control channel transmitted in a first time-frequency resource, and a second downlink control channel transmitted in a second time-frequency resource. This segmentation allows the system to dynamically allocate resources for different control channels, improving spectral efficiency while managing device complexity by dividing the control channel transmission into manageable segments with different priority levels and resource allocation strategies.
2Reliability
If preemption indication is transmitted to inform terminals of preempted resources, then reliability of resource allocation is improved, but loss of information increases due to additional signaling overhead
Solution Approach 1:
The patent extracts the preemption indication information from the general downlink control channel and transmits it separately through a specific second downlink control channel in a second time-frequency resource. This extraction approach improves reliability by ensuring that preemption information is clearly communicated to terminals without being lost in general control channel traffic, while managing signaling overhead by using a dedicated resource for this specific function rather than adding to the general control channel burden.
3Adaptability or versatility
If multiple downlink control channels are transmitted in different time-frequency resources, then adaptability of resource allocation is improved, but device complexity increases due to more complex terminal processing requirements
Solution Approach 1:
The patent applies local quality by assigning different properties to different parts of the downlink control channel transmission. The first downlink control channel in the first time-frequency resource has different characteristics (e.g., higher priority, different modulation and coding scheme) compared to the second downlink control channel in the second time-frequency resource. This allows the system to adapt resource allocation to different traffic requirements while providing clear differentiation that helps terminals process the channels more efficiently by knowing which resource to monitor for which type of control information.
Data Source
AI summary
A base station of a wireless communication system is disclosed. The base station of the wireless communication includes a communication module, and a processor. The processor generates a preemption indicator indicating a preempted resource. In this case, the resource indicated by the preemption indicator does not include an orthogonal frequency divisional multiplexing (OFDM) symbol configured as an uplink (UL) symbol by a radio resource control (RRC) signal. The processor is configured to transmit the preemption indicator to a user equipment of the wireless system based on a predetermined period.