Phase Shifted Channel Bursts for Wireless Handover
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Solution Overview
Problem
Wireless terminals experience interruptions and data packet loss during handovers between base stations in wireless broadcast systems due to variable time delays and signal fading, especially in unidirectional networks without an uplink channel, leading to imperfect reception and lost information.
Innovation Solution
Implementing a wireless system with multiple base stations that transmit data packets in channel bursts with specific phase shifts, allowing wireless terminals to receive seamless data flow by synchronizing with neighboring cells' frequency and phase shift parameters, thereby reducing packet loss during handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If base stations transmit data packets independently without coordination, then system complexity is reduced and ease of operation is improved, but packet loss increases during handover and data flow continuity deteriorates
Solution Approach 1:
The patent applies preliminary action by having base stations transmit data packets in advance with predetermined phase shifts before handover occurs. Each base station is configured to transmit packets at specific time offsets relative to others, so that when a wireless terminal moves between base stations, the packets are already positioned in the transmission timeline to continue seamlessly without interruption or loss.
2Device complexity
If base stations transmit data packets simultaneously without phase shift coordination, then device complexity is reduced, but data flow continuity deteriorates and packet loss increases during handover
Solution Approach 1:
The patent applies parameter changes by introducing predetermined phase shift parameters to the base station transmissions. Each base station is assigned a specific phase shift value (e.g., 0 degrees, 120 degrees, 240 degrees) that modifies the timing of packet transmission. This parameter adjustment ensures that packets from different base stations are distributed in a coordinated manner, maintaining continuous data flow during handover while requiring only simple configuration at each base station.
3Adaptability or versatility
If wireless terminals receive data from multiple base stations without phase shift alignment, then adaptability is improved, but information loss increases during handover
Solution Approach 1:
The patent applies feedback mechanisms where wireless terminals receive and process feedback information about the phase shift configurations from multiple base stations. The terminal uses this feedback to properly synchronize its reception timing and interpret packets correctly from different base stations with different phase shifts, ensuring accurate data reconstruction without information loss during handover between cells.
Data Source
AI summary
The present invention provides methods and apparatus for a wireless system broadcasting a plurality of data packets to at least one wireless terminal. The wireless system comprises a plurality of base stations that interfaces to a backbone network in order to receive the plurality of data packets from a service source. Data packets are sent to a wireless terminal by a first base station transmitting a first channel burst and by a second base station transmitting a second channel burst, in which corresponding time offsets of the channel bursts, as characterized by amounts phase shifts, are different. Consequently, when the wireless terminal executes a handover from the first base station to the second base station, a probability that some of the data packets are lost, as result of practical network considerations, is reduced.