Uplink Relay Coverage with Pathloss-Based Terminal Power Selection
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Solution Overview
Problem
In communication systems with uplink relay nodes, terminal devices face issues with excessive uplink transmit power, leading to interference when uplink coverage is enhanced, causing imbalance between uplink and downlink coverage.
Innovation Solution
The terminal device determines uplink transmit power based on downlink quality and pathloss delta, using information from the network device to accurately identify its location within the coverage area of either the primary or secondary network device, adjusting power levels to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If uplink relay node is deployed to enhance uplink coverage, then uplink coverage is improved, but uplink transmit power becomes excessively high causing interference to other uplink services
Solution Approach 1:
The patent applies local quality by differentiating between two coverage areas: a first coverage area served by the network device and a second coverage area served by the uplink relay node. The terminal device determines its location and selects the appropriate network device for uplink transmission based on this spatial differentiation, ensuring that each area uses the optimal transmission path without causing interference.
Solution Approach 2:
The patent introduces an intermediary mechanism where the terminal device acts as a mediator to determine its own location and select the appropriate network device. The terminal device receives first information from the network device, determines whether it is in the first or second coverage area, and selects the corresponding network device for uplink transmission, thereby preventing excessive transmit power and interference.
2Ease of operation
If terminal device uses downlink quality for uplink scheduling, then scheduling simplicity is maintained, but uplink transmit power becomes excessively high
Solution Approach 1:
The patent implements feedback by having the terminal device receive first information from the network device that includes quality threshold and pathloss delta. The terminal device uses this feedback information to determine its location and select the appropriate network device for uplink transmission, thereby controlling uplink transmit power while maintaining scheduling simplicity.
Solution Approach 2:
The patent applies parameter changes by introducing quality threshold and pathloss delta as new parameters for uplink power control. The terminal device uses these parameters to determine whether to transmit to the network device or uplink relay node, thereby controlling transmit power levels while maintaining ease of operation.
3Stability of the object's composition
If additional uplink frequency is set to balance coverage, then coverage balance is improved, but network deployment cost increases
Solution Approach 1:
The patent applies universality by making the uplink relay node serve multiple functions: it provides uplink coverage enhancement for terminals in the second coverage area, and also serves as a reference for pathloss calculation for terminals in the first coverage area. This multi-functionality achieves coverage balance without requiring additional uplink frequency, thereby reducing deployment cost.
Solution Approach 2:
The patent uses copying by having the uplink relay node replicate the network device's function in the uplink direction. The uplink relay node receives uplink signals from terminals and forwards them to the network device, effectively copying the network device's transmission function for terminals that cannot directly reach it, thereby achieving coverage balance without additional frequency resources.
Data Source
AI summary
This application relates to the field of communication technologies, and discloses a communication method and apparatus. The terminal device receives first information from a first network device, where the first information includes a quality threshold and a pathloss delta, obtains downlink quality and a downlink pathloss of a first path, and determines uplink transmit power of a second path based on the downlink pathloss and the pathloss delta when determining that the downlink quality is lower than the quality threshold.