A method for adjusting the timing of uplink transmission
A technology for sending timing and timing adjustment, applied in the field of communication, can solve the problems of high resource overhead, difficult receiving timing, and large time uncertainty, and achieve the effect of improving the utilization rate of uplink resources and reducing the timing complexity
Active Publication Date: 2022-04-15
SOUTHEAST UNIV
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Problems solved by technology
On the one hand, this guard time causes quite high resource overhead (the uplink burst is 1 time slot, which corresponds to about 30% overhead), on the other hand, the time uncertainty of the control station receiving the uplink burst is very large, which also makes it difficult to receive the timing
In addition, if the mobile station cannot obtain the network slot time for some reason, the current mechanism cannot support the uplink transmission of the mobile station
Method used
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[0029] Below in conjunction with accompanying drawing and specific embodiment, take VDE-SAT system as example to further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art Modifications of various equivalent forms of the present invention by personnel fall within the scope defined by the appended claims of the present application.
[0030] UTC is the abbreviation of Coordinated Universal Time. The full name is Coordinated Universal Time, also known as Universal Time, Universal Standard Time, and International Coordinated Time. Control stations are also called base stations, central nodes, space stations, satellites, shore stations, etc. Mobile stations can be wireless sensors, ships, VHF band communication equipment and other terminal equipment that can receive VDES signals. ...
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The invention discloses an uplink sending timing adjustment method, in which a control station sends a downlink burst relative to the network time slot time; if the mobile station can obtain the network time slot time, the mobile station is ahead of the network time slot time by an estimated path propagation delay direction The control station sends an uplink PRACH burst; if the mobile station cannot obtain the network time slot time, the mobile station first calculates the current network time slot time, and then sends an uplink PRACH to the control station in advance of the estimated path propagation delay relative to the calculated network time slot time Burst: The mobile station updates the estimated path propagation delay and current network slot time based on the uplink timing error notified by the control station, and sends an uplink burst to the control station with the latest estimated propagation delay ahead of the current network slot time , the present invention not only has a high utilization rate of uplink resources, but also has a small complexity in the timing of uplink burst reception of the control station.
Description
technical field [0001] The present invention relates to the communication field, and more specifically, to a method for adjusting uplink transmission timing. Background technique [0002] VHF (Very High Frequency) Data Exchange System (VDES, VHF Data Exchange System) is a communication system for realizing E-navigation (e-Navigation) services. The minimum transmission unit length of the VDES system is 1 time slot, and the time is 80 / 3ms. In VDES, there are ground communication VDE-TER for ground shore station and mobile station communication, which adopts centralized resource scheduling communication mode, and satellite communication VDE-SAT for satellite and mobile station communication. [0003] Multiple mobile stations in VDE-TER and VDE-SAT share the uplink channel in a time-division multiplexing manner. In the current design, the mobile station sends uplink bursts to the control station according to the network slot time. Because the path propagation delay δ∈[δ MIN ...
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IPC IPC(8): H04W56/00H04W74/08
CPCH04W56/0045H04W56/0065H04W74/0833
Inventor 尤肖虎汪茂张菁菁
Owner SOUTHEAST UNIV