Frequency Hopping for Downlink Control Information in Wireless Systems
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Solution Overview
Problem
In wireless communications, the process of blindly decoding downlink control information (DCI) by user equipment (UE) increases power consumption, and existing methods do not effectively mitigate signal loss due to fading or interference in downlink control channels.
Innovation Solution
Implementing frequency hopping for DCI over downlink shared channels, where the base station transmits DCI on a set of symbols that change frequencies within or across PDSCH occasions, allowing the UE to determine a frequency hopping configuration and monitor these changes based on a control message, thereby reducing power consumption and improving communication reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE blindly decodes PDCCH transmissions to receive DCI, then the UE can obtain downlink control information, but power consumption increases
Solution Approach 1:
The patent changes the transmission parameter of DCI from PDCCH to PDSCH, and introduces frequency hopping parameter changes to improve reliability while controlling power consumption through selective monitoring based on control messages
2Reliability
If DCI is transmitted on PDCCH, then control information can be delivered, but signal loss due to fading or interference cannot be effectively mitigated
Solution Approach 1:
The patent introduces dynamic frequency hopping for DCI transmission on PDSCH, where the frequency location changes across different PDSCH occasions or within a PDSCH occasion, providing adaptability to combat fading and interference
Solution Approach 2:
The patent changes the transmission channel parameter from PDCCH to PDSCH and introduces frequency hopping parameters to mitigate the harmful effects of fading and interference
3Reliability
If frequency hopping is implemented for DCI over PDSCH, then frequency diversity increases and communication reliability improves, but system complexity increases
Solution Approach 1:
The patent segments the frequency hopping configuration into different types (intra-occasion and inter-occasion hopping) with different complexity levels, allowing selective application based on service requirements
Solution Approach 2:
The patent makes the frequency hopping configuration dynamic through control messages that can activate or deactivate hopping, and adjust hopping parameters adaptively
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive at least one control message including an indication that frequency hopping for downlink control information (DCI) is activated for physical downlink shared channel (PDSCH). The UE may determine a frequency hopping configuration (e.g., a frequency hopping pattern) for the DCI, which may be applied for PDSCH occasions, for a group of PDSCH occasions, or until changed by another indication from the network. The UE may also receive a downlink reference according to the frequency hopping configuration. For example, if intra-occasion frequency hopping is activated, demodulation reference signals (DMRS) may be received in each hop of the DCI within a PDSCH occasion, and if inter-occasion frequency hopping is activated, DMRS may be received once per PDSCH occasion.