Selective Multicast Retransmission Decoding via Control Channel Indication
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Solution Overview
Problem
In wireless communications, multicast retransmissions in wireless systems often result in unnecessary baseband processing and power consumption for UEs that have already successfully decoded the initial multicast transmission, as they decode the entire retransmitted data despite only needing to verify if it is a retransmission or new data.
Innovation Solution
The implementation of an indication mechanism in the downlink control channel, using a group radio network temporary identifier (G-RNTI) or a layer two retransmission indicator bit, allows UEs to selectively decode multicast transmissions, refraining from processing retransmissions if they were successfully received initially, thereby conserving power and processing resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs decode all multicast retransmissions to verify if they are new data, then data reception reliability is improved, but baseband processing overhead and power consumption increase
Solution Approach 1:
The patent extracts the retransmission identification function from the data decoding process by introducing a separate indication field in the downlink control channel. This allows UEs to identify retransmissions without performing full data decoding, thereby separating the verification function from the main data reception flow and reducing processing overhead.
Solution Approach 2:
The patent applies preliminary action by providing retransmission indication information before the actual data transmission in the downlink control channel. UEs can check this indication in advance to determine whether to proceed with full data decoding, preventing unnecessary processing before it occurs.
2Reliability
If UEs decode all multicast retransmissions to verify if they are new data, then data reception reliability is improved, but power consumption increases
Solution Approach 1:
The patent extracts the retransmission identification function from the data decoding process by introducing a separate indication field in the downlink control channel. This allows UEs to identify retransmissions without performing full data decoding, thereby separating the verification function from the main data reception flow and reducing processing overhead.
Solution Approach 2:
The patent applies preliminary action by providing retransmission indication information before the actual data transmission in the downlink control channel. UEs can check this indication in advance to determine whether to proceed with full data decoding, preventing unnecessary processing before it occurs.
3Productivity
If indication mechanism is added to identify retransmissions, then processing efficiency is improved, but downlink control channel overhead increases
Solution Approach 1:
The patent applies partial action by implementing different indication mechanisms with varying levels of overhead. The network can select between a simple New Data Indicator (NDI) toggle bit (1 bit) or a more explicit retransmission indication field, allowing partial implementation based on specific system requirements and trade-offs between overhead and processing efficiency.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may selectively determine to decode a downlink shared channel multicast transmission based on whether the downlink shared channel includes a retransmission of an initial multicast transmission. A base station may transmit a message in a downlink control channel to indicate if the downlink shared channel is carrying the retransmission of the initial multicast transmission. For example, the base station may transmit a group random network temporary identifier, downlink control information with a retransmission indicator bit, or both to indicate if the downlink shared channel is carrying the retransmission. In some cases, the message in the downlink control channel may be received at a layer one (L1) of the UE, and the downlink shared channel transmission may be decoded at L1 of the UE and sent to a layer two (L2) of the UE for processing.