Uplink Power Control Update Latency Reduction in LTE
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Solution Overview
Problem
The current mechanism for updating uplink transmission direction power control system information in LTE is inefficient, leading to prolonged use of outdated parameters, which results in severe performance degradation due to the long duration between network decision and information usage.
Innovation Solution
Optimizing the notification and update process by introducing cell-specific paging occasions within a BCCH modification period, using a new information element systemInfoModificationUL-PC in paging messages to indicate uplink power control changes, and transmitting updated system information on DL-SCH/PDSCH according to scheduling information, allowing UEs to acquire and apply new parameters within a shorter latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the current BCCH modification period mechanism is used for updating system information, then the system maintains stability and compatibility with existing LTE protocols, but the update latency becomes excessively long causing severe performance degradation in uplink transmission
Solution Approach 1:
The patent segments the system information update process into two distinct parts: (1) downlink power control parameters updated via paging messages with fast notification, and (2) other system information updated via traditional BCCH modification periods. This segmentation allows critical uplink power control parameters to be updated independently with reduced latency, while maintaining the stability of the overall system through the traditional mechanism for other parameters.
Solution Approach 2:
The patent implements preliminary notification through paging messages that inform UEs about upcoming system information changes before the actual update occurs. The paging message includes a systemInfoModificationUL-PC indicator that alerts UEs to prepare for updated uplink power control parameters, allowing the network to proactively manage the update timing and reduce latency without disrupting ongoing transmissions.
2Reliability
If the network frequently updates system information to maintain optimal uplink power control, then uplink transmission performance is maintained, but the complexity of system information management and notification increases
Solution Approach 1:
The patent divides system information into categories with different update mechanisms: uplink power control parameters use fast paging-based updates, while other parameters use traditional BCCH modification periods. This segmentation reduces the management complexity for each category by applying the most appropriate update frequency and method, avoiding the need to frequently update all system information parameters.
Solution Approach 2:
The patent introduces an intermediary paging message mechanism that acts as a bridge between the network's decision to update parameters and the actual parameter transmission. The paging message with systemInfoModificationUL-PC indicator serves as an intermediary notification layer that coordinates updates without requiring complete system information retransmission, simplifying the overall management process.
3Adaptability or versatility
If the traditional system information update mechanism is used, then all system information parameters are updated uniformly, but uplink power control parameters cannot be updated independently leading to performance degradation
Solution Approach 1:
The patent segments system information update capabilities to allow independent updating of uplink power control parameters through paging messages, while other system information parameters continue to use the traditional BCCH modification period mechanism. This enables selective, independent updates of critical parameters without waiting for uniform system-wide update cycles.
Solution Approach 2:
The patent implements dynamic update mechanisms where the network can flexibly choose between fast paging-based updates for uplink power control parameters and traditional BCCH modification periods for other parameters. This dynamic approach allows the system to adapt update frequencies and methods based on the specific parameter type and current network conditions, optimizing both responsiveness and resource usage.
Data Source
AI summary
In an embodiment, a method for controlling an uplink signal transmission power in a communication device is provided. The method may include receiving a first message in a control channel modification time period, the first message including scheduling information about the timing of the transmission of a second message, the second message including an uplink signal transmission power related information, which will be transmitted by another communication device in the same control channel modification time period, controlling the communication device to receive the second message in accordance with the scheduling information, and controlling the uplink signal transmission power, which is used by the communication device for transmitting signals, depending on the uplink signal transmission power related information.