Wireless Control Signaling Overhead Reduction via Selective Retransmission
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Solution Overview
Problem
Current wireless communication systems face inefficiencies due to high overhead in shared data channel signaling, particularly in HSDPA, which affects performance for low-throughput and delay-sensitive applications, and does not consider issues related to continuous packet connectivity and UE battery life.
Innovation Solution
The system eliminates the transmission of control channel signaling for new data packets and only transmits it for retransmissions, and introduces a discontinuous reception mode for user equipment (UE) to reduce power consumption by allowing it to be powered down at predetermined intervals, using assigned parameters for data transmission on shared channels without HS-SCCH signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control channel signaling is transmitted for every data packet on the shared data channel, then the UE can accurately receive and process data, but the overhead on the shared channel increases significantly
Solution Approach 1:
The patent extracts control channel signaling from every data packet transmission and consolidates it only for retransmissions. The Node B transmits control signaling on the shared control channel specifically for retransmitted packets, while new packets are transmitted without accompanying control signaling on the shared data channel, thereby reducing overhead while maintaining reception accuracy through selective signaling.
Solution Approach 2:
The patent applies preliminary action by having the UE store previously received data packets and their associated control signaling information. When a retransmission occurs, the UE can retrieve the stored control signaling information and combine it with the retransmitted packet, eliminating the need to retransmit the same control signaling and thereby reducing overhead.
2Reliability
If the UE continuously monitors the shared control channel to determine data transmission, then data reception reliability is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic action through Discontinuous Reception (DRX) cycles, where the UE alternates between active monitoring periods and sleep periods. During DRX cycles, the UE monitors the shared control channel only at predetermined intervals rather than continuously, significantly reducing power consumption while maintaining the ability to detect data transmissions when they occur.
Solution Approach 2:
The patent uses feedback mechanisms where the UE sends acknowledgments (ACK/NACK) for received packets, and the Node B uses this feedback to determine whether retransmissions are needed. This feedback loop allows the system to maintain reliability with reduced monitoring by only activating full monitoring modes when feedback indicates potential transmission events.
3Quantity of substance
If control channel signaling is transmitted for retransmissions only, then overhead is reduced, but the UE must efficiently correlate retransmissions with original packets
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of packet identifiers and sequence numbers that act as mediators between the original packet and its retransmission. These identifiers are embedded in the data packets and used by the UE to correlate retransmitted packets with their original counterparts, simplifying the matching process without requiring complex processing of control signaling information.
Solution Approach 2:
The patent applies copying by having the UE store copies of previously received data packets and their associated control signaling information in a buffer. When retransmissions arrive, the UE can directly compare and combine the retransmitted data with the stored copies, eliminating the need for complex correlation algorithms and reducing processing complexity.
4Use of energy by moving object
If DRX cycles are implemented for power saving, then UE battery life is extended, but data transmission delay may increase
Solution Approach 1:
The patent implements dynamic adjustment of DRX cycle parameters based on traffic conditions and service requirements. The system can adaptively modify the length and frequency of DRX cycles, allowing shorter cycles for delay-sensitive services and longer cycles for non-critical traffic, thereby balancing power consumption with transmission delay requirements in different operational scenarios.
Data Source
AI summary
A method for wireless communications where a control packet is not transmitted for all transmissions of a new data packet. A control packet is only sent with a retransmission of a data packet where the previously transmitted data packet is not completely received. The control packet contains information related to a previously transmitted data packet. The previously transmitted data packet and the retransmission data packet are derived from common data. The common data is derived based on the information related to the previously transmitted data packet, wherein the previously transmitted data packet and the retransmission data packet are associated with a series of data packets.