PUSCH Transport Block Building to Reduce Carrier-Aggregation CRC Failures
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in power allocation for Physical Uplink Shared CHannel (PUSCH) component carriers under carrier aggregation, leading to potential cyclic redundancy check failures due to limited UE transmit power and prioritization rules that can result in some carriers being allocated little or no power.
Innovation Solution
A user equipment (UE) receives uplink grants for multiple PUSCH component carriers, ranks logical channels, and builds transport blocks on higher ordered carriers, optimizing power allocation to ensure successful transmission across all carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing power allocation rules are used for PUSCH component carriers, then the transmission process is simple, but cyclic redundancy check failures occur due to insufficient power allocation
Solution Approach 1:
The UE performs preliminary actions by ranking logical channels and ordering component carriers before power allocation occurs. The UE determines the set of logical channels to be transmitted, ranks them based on priorities, and orders component carriers based on their power capabilities and channel rankings. This preliminary organization ensures that when power is allocated, the highest priority channels receive power from the most capable carriers, preventing CRC failures before they occur.
Solution Approach 2:
The invention changes the parameters of power allocation by introducing dynamic ordering of component carriers based on both power capability and logical channel ranking. Instead of static or random power allocation, the system adjusts the allocation strategy by changing the order in which carriers are processed and assigning power based on the combined criteria of carrier power capability and channel priority, thereby improving transmission reliability.
2Reliability
If higher priority logical channels are allocated power first, then transmission reliability improves, but the complexity of managing power allocation increases
Solution Approach 1:
The system performs preliminary ranking of logical channels and ordering of component carriers before power allocation begins. By pre-establishing the priority order of channels and the ordered sequence of carriers based on power capability and channel ranking, the power allocation process becomes a systematic iteration through predetermined lists rather than complex real-time decision-making, maintaining ease of operation while ensuring reliable transmission of high-priority channels.
3Productivity
If carrier aggregation is used to increase bandwidth, then data transmission capacity increases, but power allocation inefficiency increases leading to CRC failures
Solution Approach 1:
The invention segments the power allocation process by handling each component carrier individually in a systematic order. Instead of allocating power uniformly across all carriers or treating them as a single pool, the system processes carriers one at a time in a predetermined order, assigning power to each carrier's highest priority logical channels. This segmentation ensures that power is efficiently distributed across the aggregated carriers without causing CRC failures, maintaining both high capacity and reliability.
Data Source
AI summary
A UE employing carrier aggregation receives an uplink grant from a wireless communication system base station for each of a plurality of Physical Uplink Shared CHannel (PUSCH) component carriers. The UE orders each PUSCH component carrier for transmission based at least in part on the uplink grant. The UE ranks logical channels for uplink transmission; and then builds transport blocks comprising data of higher ranked logical channels on higher ordered component carriers. The UE can then transmit the transport blocks across the component carriers to the base station.