MAC-CE Duplication via Cross-Carrier ID Signaling
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Solution Overview
Problem
Conventional MAC-CE duplication techniques in wireless communication networks are inefficient, particularly in 5G NR systems, as they do not include CC IDs in duplicated MAC-CEs, leading to increased latency and reduced throughput, especially in transmitting periodic data across multiple component carriers.
Innovation Solution
The described techniques enable cross carrier repetition by signaling CC IDs for duplicated MAC-CEs, allowing devices to combine signals more quickly and reliably, using configuration messages that include fixed or unique intended CC IDs, facilitating operations in ultra-reliable low latency communication modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional per-CC based MAC-CE techniques are used without CC ID signaling, then device complexity is reduced, but latency increases and throughput decreases due to multiple processing cycles
Solution Approach 1:
The patent applies preliminary action by pre-configuring CC ID mappings through RRC signaling before MAC-CE transmission. The UE receives RRC configuration messages that establish fixed or unique intended CC IDs for duplicated MAC-CEs, allowing the UE to immediately identify and combine corresponding MAC-CEs and TBs without requiring complex real-time analysis, thus reducing latency while maintaining manageable complexity
Solution Approach 2:
The patent introduces an intermediary mechanism by using RRC configuration messages as a mediator between the gNB and UE. This intermediary layer pre-establishes the mapping relationships between duplicated MAC-CEs and their target CCs, enabling efficient identification and combination operations without requiring complex real-time processing at the MAC layer
2Reliability
If MAC-CE duplication is performed without CC ID inclusion, then signaling overhead is reduced, but reliability decreases due to inability to identify target CC for combination
Solution Approach 1:
The patent uses preliminary action by pre-establishing CC ID mappings through RRC configuration before MAC-CE duplication occurs. The gNB configures the UE with fixed or unique intended CC IDs that are associated with specific MAC-CE duplicates, enabling the UE to reliably identify which CC each duplicated MAC-CE targets without requiring CC ID fields in every MAC-CE transmission
Solution Approach 2:
The RRC configuration acts as an intermediary that bridges the gap between MAC-CE duplication and CC identification. By pre-configuring the mapping relationships, the intermediary RRC layer enables reliable CC identification without adding information overhead to the MAC-CE layer itself
3Productivity
If multiple cycles are used to process duplicated MAC-CEs and TBs, then processing accuracy is improved, but productivity decreases due to extended processing time
Solution Approach 1:
The patent applies preliminary action by pre-configuring all necessary CC ID mappings and duplication parameters through RRC signaling before data transmission begins. This allows the UE to process duplicated MAC-CEs and TBs in a single cycle with high accuracy, as all identification rules are predetermined, thereby improving throughput without sacrificing matching precision
Data Source
AI summary
Aspects for MAC-CE duplication for packet repetition in uplink and downlink are disclosed. In one particular aspect a method of wireless communication includes receiving, by a user equipment (UE), a message including a component carrier (CC) identifier (ID) for a particular Medium Access Control (MAC) control element (MAC-CE). The method also includes receiving, by the UE, a first MAC-CE via a first CC of a plurality of CCs, and receiving, by the UE, a second MAC-CE via a second CC of the plurality of CCs. The CC ID included in the message corresponds to a CC ID for the second MAC-CE. The method further includes combining, by the UE based on the CC ID for the second MAC-CE, a first signal corresponding to the first MAC-CE and a second signal corresponding to the second MAC-CE to generate a combined signal for decoding.