Uplink Preamble DPCCH Transmission for Power Control
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Solution Overview
Problem
In the context of mobile communications, particularly in UMTS networks, base stations face challenges in controlling uplink transmission power when they do not receive DPCCH signals for an extended period, leading to difficulties in maintaining power control and link synchronization.
Innovation Solution
A method where a terminal sends a preamble including DPCCH control information to the network-side device when the uplink transmission gap exceeds a predetermined threshold, allowing the base station to regain control over uplink transmission power by sending a dedicated physical control channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE sends DPCCH periodically during discontinuous transmission to maintain power control and link synchronization, then power control and synchronization are maintained, but uplink interference increases and energy is wasted
Solution Approach 1:
The patent implements periodic DPCCH transmission during discontinuous transmission periods to maintain power control and link synchronization. The UE sends DPCCH at periodic intervals rather than continuously, which maintains the necessary control functions while reducing overall transmission time and associated interference.
Solution Approach 2:
The patent extracts the essential control function from continuous transmission by sending only DPCCH (dedicated physical control channel) during discontinuous periods, separating the control signaling from data transmission. This allows power control and synchronization to be maintained without transmitting unnecessary data, thereby reducing uplink interference.
2Object-generated harmful factors
If the UE does not send DPCCH periodically during discontinuous transmission to reduce uplink interference, then uplink interference is reduced, but the base station cannot control uplink transmission power
Solution Approach 1:
The patent applies preliminary action by having the UE send a preamble containing DPCCH control information before initiating uplink data transmission after a discontinuous transmission period. This preliminary DPCCH transmission allows the base station to establish power control parameters in advance, ensuring that when data transmission begins, the base station can immediately control uplink transmission power effectively.
Solution Approach 2:
The patent introduces a preamble as an intermediary element between the discontinuous transmission period and data transmission. This preamble carries DPCCH control information that serves as a mediator, enabling the base station to regain power control capability without requiring continuous DPCCH transmission during the entire discontinuous period.
3Ease of operation
If the UE sends a preamble with DPCCH control information before uplink transmission after a long gap, then the base station can control uplink transmission power, but transmission delay increases
Solution Approach 1:
The patent applies partial action by sending a condensed preamble containing only essential DPCCH control information rather than a full continuous transmission. This partial transmission provides just enough control signaling for the base station to establish power control, minimizing the time overhead while achieving the necessary control function.
Solution Approach 2:
The patent changes the transmission parameters by switching from periodic DPCCH transmission during discontinuous mode to a single preamble transmission with DPCCH control information before data transmission. This parameter change optimizes the balance between power control capability and transmission delay by adapting the transmission pattern to the specific operational state.
Data Source
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AI summary
The present invention discloses a preamble Preamble sending method, including: acquiring a first uplink transmission gap, where the first uplink transmission gap is a time interval between initiation, by a terminal, of current uplink transmission and termination of the most recent uplink transmission; and when the first uplink transmission gap is greater than or equal to at least one time threshold in a first preset time threshold, sending a Preamble that includes a DPCCH to a network side. In the preamble Preamble sending method disclosed in the present invention, when a terminal initiates uplink transmission, the terminal first acquires a time interval between initiation, by the terminal, of current uplink transmission and termination of the most recent uplink transmission; and when the time interval is greater than or equal to at least one time threshold in a preset time threshold, the terminal sends a Preamble that includes a DPCCH to a network side, so that a network-side device located at a base station can control uplink transmission power of the terminal according to a sent DPCCH pulse.