Uplink Resource Block Limiting for Intra-band Non-contiguous Carrier Aggregation
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Solution Overview
Problem
In 3GPP LTE systems, carrier aggregation can lead to a lowering of reference sensitivity due to transmission leakage, particularly in intra-band non-contiguous uplink carrier aggregation, which affects the reception quality.
Innovation Solution
The method involves limiting the number of resource blocks (RBs) in the primary component carrier to 10 when the channel bandwidth of the primary and secondary component carriers is within specific ranges, and the gap between sub-blocks meets predetermined criteria, to maintain reference sensitivity on the secondary component carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used to increase channel bandwidth, then data transmission capacity is improved, but reference sensitivity deteriorates due to transmission leakage
Solution Approach 1:
The patent changes the parameter of resource block allocation by limiting the number of RBs in the primary component carrier to 10 when specific conditions are met (channel bandwidth of 25/50/75/100 RBs and gap between sub-blocks within predetermined range). This parameter change reduces transmission leakage power while maintaining the carrier aggregation functionality, thereby preserving reference sensitivity requirements.
2Productivity
If the number of resource blocks in primary component carrier is increased to maximize bandwidth utilization, then transmission efficiency is improved, but transmission leakage increases causing reference sensitivity to drop
Solution Approach 1:
The patent applies parameter changes by setting a specific limit (10 RBs) on the number of resource blocks that can be allocated in the primary component carrier under certain conditions. This directly controls the transmission leakage level while allowing efficient bandwidth utilization through carrier aggregation, resolving the contradiction between transmission efficiency and harmful leakage effects.
Solution Approach 2:
The patent implements a feedback mechanism where the base station determines whether to limit RB allocation based on evaluating current transmission conditions including channel bandwidth configuration and gap between sub-blocks. This feedback control allows dynamic adjustment of RB limits to maintain reference sensitivity while optimizing transmission efficiency for different operating scenarios.
Data Source
AI summary
There is provided a method of transmitting an uplink for reference sensitivity test for intra-band non-contiguous CA in LTE-A system. The method may comprise: if a carrier aggregation (CA) is configured, if the configured CA corresponds to an intra-band CA, and if the configured CA corresponds to non-contiguous CA, transmitting an uplink on a primary component carrier using allocated resource blocks (RBs). if a channel bandwidth by an aggregation of the primary component carrier and a secondary component carrier is at least one of 25 RBs, 50 RBs, 75 RBs and 100 RBs and if a gap between two sub-blocks corresponds to a predetermined range, the number of the allocated resource block (RB) in the primary component carrier may be limited to 10 to meet a requirement for a reference sensitivity on a downlink of the secondary component carrier.