Decoupling Uplink Downlink Cell Selection Logic
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Solution Overview
Problem
In heterogeneous wireless communication networks, controlling transmission power is challenging due to differences in path loss between primary and secondary cells, leading to interference and network capacity reduction, especially when user equipment is close to pico cells, and existing solutions like cell selection bias cannot guarantee reliable downlink control signaling.
Innovation Solution
The method involves configuring user equipment to receive and transmit information based on logical cell values decoupled from physical cell IDs, using downlink control information grant messages to set transmission power levels, and associating logical cells with carrier resources like time, frequency, or spatial coding, allowing for independent optimization of uplink and downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If user equipment uses the same cell ID for both downlink reception and uplink transmission, then the configuration is simple, but interference occurs when user equipment is close to pico cells and network capacity is reduced
Solution Approach 1:
The patent segments the cell identification function into two separate logical cell values: one for downlink reception and another for uplink transmission. This allows the user equipment to independently select optimal cells for each direction, preventing interference by ensuring uplink transmission to the appropriate cell (pico or macro) based on actual signal conditions rather than using a single cell ID for both directions.
2Productivity
If cell selection bias is increased to optimize uplink transmission, then uplink capacity improves, but downlink signal quality degrades and control signaling reliability cannot be guaranteed
Solution Approach 1:
The patent introduces separate logical cell values for downlink and uplink, allowing independent optimization without the need for cell selection bias. The user equipment can select the cell with the best downlink signal for receiving control signaling while simultaneously selecting the appropriate cell for uplink transmission based on uplink signal conditions, thus maintaining both downlink reliability and uplink capacity without compromise.
3Quantity of substance
If the same carrier is used for both primary and secondary cells, then resource utilization is efficient, but the user equipment must use incorrect power settings leading to interference
Solution Approach 1:
The patent segments the power control function by introducing separate logical cell values for downlink and uplink. This enables the user equipment to calculate and apply correct transmit power settings for uplink transmission to the secondary cell based on the specific path loss to that cell, while maintaining efficient carrier resource utilization by allowing both cells to operate on the same carrier frequency.
Data Source
AI summary
A method includes receiving information at a user equipment from a first apparatus, the information indicating to the user equipment is to communicate with a second apparatus.