TPC Command Buffering for Slot Boundary Alignment
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Solution Overview
Problem
In wireless communication systems, the misalignment of combining windows for Transmitter Power Control (TPC) command bits across different slots in a Radio Link Set (RLS) leads to reduced power control performance and system inefficiencies due to opposing polarity combinations during Soft Handover operations.
Innovation Solution
A method and apparatus that involve obtaining channel measurements for both slots within a radio frame, identifying the RLS size and TPC timing offset, and generating power control command information based on these parameters to ensure accurate and aligned TPC command bit combination, thereby preventing mixed-slot combining and enhancing power control performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TPC command bits are combined across different slots to handle propagation delays, then the system can accommodate network timing variations, but power control performance deteriorates due to combining TPC bits with opposing polarities
Solution Approach 1:
The patent segments the combining window into slot-specific boundaries, ensuring that TPC command bits are combined only within the same slot rather than across multiple slots. This segmentation prevents mixing TPC bits with opposing polarities that occur in different slots, thereby maintaining power control performance while still accommodating propagation delays through appropriate timing alignment.
Solution Approach 2:
The patent applies preliminary timing alignment to shift the TPC command bits so that they arrive within the correct slot boundaries before combining occurs. By pre-adjusting the timing of TPC commands based on expected propagation delays, the system ensures that all TPC bits being combined belong to the same slot and have consistent polarity, avoiding the performance degradation caused by mixing opposite polarities.
2Device complexity
If the combining window is misaligned with slot boundaries, then the system can simplify timing synchronization, but TPC command bits from different slots are incorrectly combined
Solution Approach 1:
The patent applies local quality by making the combining window properties slot-specific rather than uniform across all slots. Each slot has its own aligned combining window that is precisely positioned to match that slot's boundaries, ensuring accurate TPC command combination for each slot individually while maintaining overall system simplicity.
3Ease of operation
If TPC command generation is not aligned with slot boundaries, then the system can reduce processing constraints, but system throughput decreases due to incorrect TPC command application
Solution Approach 1:
The patent introduces dynamic timing alignment that adapts the TPC command generation timing based on the specific slot configuration and propagation conditions. The system dynamically adjusts the timing of TPC commands to ensure they are generated and combined at the appropriate slot boundaries, optimizing both processing efficiency and system throughput for varying conditions.
Data Source
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AI summary
Systems and methodologies are described that facilitate efficient power control command management in a wireless communication environment. As described herein, techniques can be utilized by a Node B and/or other network access point to compensate for differences between uplink slot boundaries and a power control command combining period associated with the uplink slot. For example, the timing of Transmitter Power Control (TPC) bit transmission can be altered as described herein such that, if a given cell or cell sector is associated with a radio link set of size 2 or greater and a TPC timing offset of size 2 or less, TPC command information can be buffered and/or otherwise delayed to a slot following the slot in which corresponding channel measurements are obtained in order to prevent efficiency loss associated with combining TPC bits of inverse polarity corresponding to multiple disparate slots.