Closed Loop Transmit Diversity Weight Vector Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, such as UMTS networks, face challenges in optimizing signal transmission diversity in continuous packet connectivity mode, particularly in managing weight vectors for transmit diversity across multiple slots and antennas, which affects network performance and resource utilization.
Innovation Solution
The method involves receiving and holding a weight vector for closed loop transmit diversity across multiple slots, applying it to subsequent transmission bursts in discontinuous transmit mode, and using it for coherent combination of signals over multiple antennas to improve signal quality and resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If weight vectors are continuously updated and applied in every slot, then transmit diversity performance is improved, but network resources and device power consumption increase
Solution Approach 1:
The patent implements periodic action by applying weight vectors only during active transmission bursts rather than continuously in every slot. The device determines weight vectors for upcoming transmission bursts based on feedback from previous bursts, then applies them periodically when transmissions occur. This allows the system to maintain transmit diversity performance while avoiding continuous processing and power consumption during idle slots, directly resolving the contradiction between reliability improvement and energy consumption reduction.
2Reliability
If weight vectors are calculated and applied for every transmission slot, then signal quality is improved, but network resource utilization deteriorates
Solution Approach 1:
The patent applies preliminary action by determining weight vectors in advance for upcoming transmission bursts based on feedback from previous bursts. The base station provides feedback information containing weight vector components after receiving uplink signals, and the device uses this feedback to pre-calculate weight vectors before the next transmission burst occurs. This allows the system to maintain high signal quality through accurate weight vectors while reducing network resource utilization by avoiding continuous real-time calculations during every slot.
3Use of energy by moving object
If discontinuous transmission is implemented to conserve resources, then power consumption is reduced, but maintaining transmit diversity becomes more complex
Solution Approach 1:
The patent implements self-service by having the device autonomously determine weight vectors for discontinuous transmission bursts using feedback information from the base station. The device stores weight vector components received in feedback and automatically retrieves and applies the appropriate weight vectors when transmission bursts occur, without requiring continuous network control or complex coordination. This self-service mechanism reduces power consumption through discontinuous operation while managing complexity through automated local decision-making based on stored feedback data.
Data Source
AI summary
Apparatus and methods for communicating in a wireless network include receiving a weight vector in a slot for providing closed loop transmit diversity to signals in a next slot, holding the weight vector over a plurality of slots following a transmission burst, and applying the weight vector to signals in at least one slot of a subsequent transmission burst in discontinuous transmit. Additional apparatus and methods for communicating in a wireless network include determining a weight vector based on signals received from a device to provide closed loop transmit diversity feedback to the device, holding the weight vector over a plurality of slots following receiving a transmission burst, and applying the weight vector for signals received in at least one slot of a subsequent transmission burst from the device.