Uplink Allocation Map for Dual Connectivity Power Control
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Solution Overview
Problem
In dual connectivity wireless communication systems, the simultaneous transmission of a User Equipment (UE) to two connected base stations exceeds the UE's maximum allowed transmit power, leading to inefficient power utilization and potential reliability issues due to independent scheduling by each base station without considering the other's resource allocation.
Innovation Solution
A method and apparatus that involve the UE generating and transmitting an uplink allocation map to prevent simultaneous subframe allocation by both base stations, allowing for coordinated resource allocation and power distribution across subframes, thereby preventing simultaneous transmission and ensuring the UE's power is managed efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent scheduling is performed by each base station without coordination, then resource allocation flexibility is improved, but simultaneous transmission occurs causing power control issues
Solution Approach 1:
The patent introduces an uplink allocation map as an intermediary information element that mediates between independent base station scheduling and coordinated resource allocation. This map conveys uplink resource allocation information from one base station to another, enabling coordinated scheduling decisions while preserving individual base station autonomy. The intermediary mechanism resolves the contradiction by allowing flexible independent scheduling to coexist with reliable power control through information sharing.
Solution Approach 2:
The patent implements a feedback mechanism where uplink allocation information is transmitted from one base station to another via the UE or directly, creating a closed-loop system. This feedback allows base stations to adjust their scheduling decisions based on the other base station's resource allocations, preventing simultaneous transmission while maintaining scheduling flexibility. The feedback loop ensures power control reliability without sacrificing adaptability.
2Productivity
If simultaneous transmission to two base stations is allowed, then data transmission rate is improved, but UE transmit power exceeds maximum allowed level
Solution Approach 1:
The patent applies preliminary action by having base stations exchange uplink allocation map information before performing resource allocation. This advance knowledge allows each base station to proactively avoid allocating resources that would cause simultaneous transmission, rather than reacting after the fact. The preliminary exchange of allocation information enables high data rates to be achieved within power constraints by preventing overlapping allocations before they occur.
Solution Approach 2:
The patent introduces dynamic resource allocation where the uplink allocation map is updated and re-exchanged based on changing channel conditions and traffic demands. This dynamic approach allows the system to adaptively adjust resource allocations to maximize data transmission rate while continuously maintaining power constraints. The dynamic nature enables the system to exploit available capacity without exceeding UE power limits.
3Reliability
If uplink allocation map information is exchanged between base stations, then simultaneous transmission is avoided, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential uplink allocation information needed for simultaneous transmission avoidance from the complete scheduling data. Rather than exchanging entire scheduling messages, the system extracts and transmits only the critical allocation map elements (such as resource block assignments and time slot information). This extraction approach maintains reliable simultaneous transmission avoidance while minimizing signaling overhead by transmitting only the necessary information.
4Use of energy by moving object
If resource allocation is coordinated between base stations, then power utilization is optimized, but scheduling complexity increases
Solution Approach 1:
The patent segments the scheduling function into independent base station decisions augmented by allocation map exchange. Each base station maintains its own scheduling logic and only incorporates information from the other base station through the standardized allocation map mechanism. This segmentation allows power utilization optimization through coordination while keeping individual base station scheduling complexity manageable by preserving modular, independent decision-making processes.
Data Source
AI summary
A pre-5th-Generation (5G) or 5G communication system is provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). Further, a simultaneous transmission avoidance method and apparatus of a terminal is provided for use in a wireless communication system supporting the dual connectivity. The Buffer Status Report (BSR) method of a terminal connected to a first and a second base station in a wireless communication system supporting a dual connectivity according to the present disclosure includes receiving an uplink resource allocation information from the first base station, generating an uplink allocation map information of the first base station based on the uplink resource allocation information, and transmitting, when BSR for the second base station is triggered, the uplink allocation map information of the first base station and the BSR for the second base station to the second base station.