Uplink Power Control via Segmented TPC Command Groups
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Solution Overview
Problem
Current uplink power control methods in wireless communication systems supporting carrier aggregation are inefficient, as they rely on a common control region for both carrier aggregation (CA) and non-CA user equipment (UE), leading to increased signaling overhead and reduced system performance.
Innovation Solution
The implementation of a method where a base station configures and transmits separate Transmit Power Control (TPC) commands for primary and secondary serving cells within a single TPC command group, allowing for independent power control of uplink control channels on both primary and secondary serving cells, thereby reducing signaling overhead and enhancing system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common control region is used for both CA and non-CA UE, then device complexity is reduced, but signaling overhead increases and system performance deteriorates
Solution Approach 1:
The patent segments the control region into separate common control regions for CA-UE and non-CA UE, and introduces dedicated TPC command groups for PUCCH and PUSCH power control. This segmentation eliminates the need for complex common control region configuration while reducing signaling overhead by providing targeted control signals for each UE type and channel type.
2Measurement precision
If separate TPC commands are configured for primary and secondary serving cells, then power control precision is improved, but device complexity increases
Solution Approach 1:
The patent merges TPC commands for primary and secondary serving cells into unified TPC command groups that can be transmitted through the existing PCell. The base station configures TPC command groups that include power control information for multiple serving cells, allowing the UE to receive and apply separate TPC commands for PUCCH and PUSCH without requiring separate control signal transmission paths, thus maintaining precision while managing complexity.
3Reliability
If TPC commands are transmitted through PCell only, then reliability is improved, but adaptability to multi-cell configurations decreases
Solution Approach 1:
The patent makes the PCell serve multiple functions by enabling it to transmit TPC command groups that control power for both primary and secondary serving cells. The TPC command group structure is designed to be universal, accommodating different serving cell configurations (CA and non-CA UE) through a single transmission mechanism, thereby maintaining reliability while achieving adaptability to various multi-cell configurations.
Data Source
AI summary
A method of an apparatus controlling transmit power of uplink channels in a wireless communication system is provided. The method includes configuring, for a UE, a primary serving cell on which a first uplink control channel is transmitted from the UE; configuring, for the UE, a secondary serving cell on which a second uplink control channel is transmitted from the UE; configuring a first TPC command and a second TPC command in a single TPC command group, the first TPC command being associated with transmit power of the uplink control information of the primary serving cell, the second TPC command being associated with transmit power of the uplink control information of the secondary serving cell, scrambling downlink control information (DCI) based on an identifier associated with a TPC, the DCI comprising the single TPC command group; transmitting, to the UE, a downlink control channel comprising the scrambled DCI.