Uplink-Only Cell Switch via Physical Layer Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face inefficiencies in performing inter-cell mobility operations, particularly when triggered by maximum permissible exposure conditions, leading to resource wastage and potential interference, especially in scenarios where only the uplink or downlink requires a cell switch.
Innovation Solution
Implementing a method for an uplink-only cell switch based on physical-layer or medium-access-control layer inter-cell mobility operations, where the user equipment determines and requests a switch only for the uplink, allowing separate beam training and communication to comply with exposure limits while maintaining optimal downlink performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cell switch is performed for both uplink and downlink when only one direction requires it, then exposure limits are satisfied, but computing and communication resources are wasted
Solution Approach 1:
The patent segments the cell switch operation into separate uplink and downlink components. When a maximum permissible exposure condition is detected, the system performs an uplink-only cell switch rather than switching both uplink and downlink simultaneously. This segmentation allows the downlink to continue using the original cell while only the uplink switches to a different cell, thereby satisfying exposure limits while conserving computing and communication resources that would otherwise be wasted on unnecessary downlink switching operations.
2Reliability
If a full cell switch is performed, then exposure conditions are met, but inter-cell interference increases
Solution Approach 1:
The patent applies segmentation by dividing the cell switch operation into uplink-specific and downlink-specific components. When exposure conditions require a cell switch, only the uplink performs the switch to a different cell while the downlink maintains its connection to the original cell. This reduces the number of cells simultaneously switching and thereby decreases inter-cell interference compared to a full bilateral cell switch.
Solution Approach 2:
The patent implements local quality by applying different cell configurations to different directions (uplink vs. downlink). The uplink uses a first cell while the downlink uses a second cell, allowing each direction to be optimized independently. This local differentiation reduces interference by preventing simultaneous switching in both directions, thereby maintaining better overall network quality while still meeting exposure requirements.
3Productivity
If separate beam training is performed for uplink and downlink, then optimal performance is achieved, but signaling overhead increases
Solution Approach 1:
The patent segments the beam training process into separate uplink beam training and downlink beam training operations. This allows each direction to undergo independent beam training optimized for its specific requirements. The uplink beam training focuses on optimizing uplink transmission beams while downlink beam training optimizes downlink reception beams, achieving optimal performance for each direction without requiring redundant joint training procedures.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may transmit, to a base station, a request for a cell switch based at least in part on a trigger condition associated with an uplink-only cell switch being satisfied; and perform the uplink-only cell switch based at least in part on a physical-layer or medium-access-control layer inter-cell mobility operation with the base station based at least in part on transmitting the request. Numerous other aspects are provided.