A method and system for determining inroute frame timing for a Very Small Aperture Terminal (VSAT) includes receiving an appointment to transmit, on an inroute, at a start of a slot X of a frame number M; establishing, at a VSAT, an arrival time of a super frame numbering packet (SFNP) including a satellite ephemeris vector and a frame number N; calculating, at the VSAT, a timing offset (T.sub.RO) to be applied to the arrival time to compensate for a time varying gateway-satellite-terminal propagation delay (T.sub.HS+T.sub.SR); setting a transmit instant as an end of the T.sub.RO after the arrival time; adding to the transmit instant a duration of X slots and a duration of (M-N) frames; and transmitting a burst, on the inroute from the VSAT, at the transmit instant. In the method, the calculating is based on computing T.sub.HS+T.sub.SR from the satellite ephemeris vector, a gateway transmits the SFNP and receives the burst in the slot X within the frame number M of the inroute, and N is greater than or equal to M. A method and system for using ephemeris data for inroute timing is disclosed.

A system and method are disclosed for providing single-hop communication sessions in a satellite network. A timing offset is selected based on a system timing reference, and used to establishing a common timing reference. A synchronization signal is transmitted from a gateway to a satellite based on time slots aligned with the common timing reference, and subsequently forwarded from the satellite to all terminals managed by the gateway. Communication sessions are initiated by terminals using the common timing reference, and downlink transmissions from the satellite to the terminals are aligned with the synchronization signal.

A method and an apparatus for processing a synchronization signal block, and a communications device are provided. The method includes: detecting a Synchronization Signal Block (SSB) at a preset frequency domain location to obtain a first SSB, where the first SSB includes at least one of the following: an SSB having a target Extended Cyclic Prefix (ECP) or a plurality of identical SSBs. The method further includes decoding the first SSB.

While suppressing a power consumption of an aerial-floating type communication relay apparatus, an interference in a multi-feeder link of a same frequency between the communication relay apparatus and plural gateway (GW) stations is suppressed. A relay communication station of the communication relay apparatus performs a first interference suppression process and a second interference suppression process by switching therebetween. The first interference suppression process suppresses an interference signal that causes an interference by a transmission signal transmitted from a gateway station and received with a directional beam corresponding to another gateway station, by using a propagation path response estimated with one frequency in a transmission signal band as an estimation frequency based on a reception result of a pilot signal without dividing a transmission signal band of a feeder link. The second interference suppression process divides a transmission signal band of a feeder link into plural divided frequency bands, and suppresses the interference signal by using a propagation path response estimated with one frequency in the divided frequency band as an estimation frequency based on a reception result of a pilot signal, for each of the divided frequency bands.

Devices, methods, and systems for uplink synchronization in time division multiple access (TDMA) satellite network. In one embodiment, an earth-based satellite terminal is configured to communicate with a satellite hub through a satellite using the TDMA communication protocol. The earth-based satellite terminal is configured to determine its own location, a location of the satellite, estimate a distance between the location of the terminal and the location of the satellite, determine a Coarse Timing Advance based on the distance that is estimated, and transmit data to the satellite based on the Coarse Timing Advance and the TDMA communication protocol. The Coarse Timing Advance may allow uplink TDMA communication without a preamble transmission on a random access channel, the preamble transmission being required in many conventional systems.

According to the present invention, a user equipment (UE) calculates its paging occasion based on a specific beam to monitor paging. In detail, the UE selects at least one beam among multiple beams, calculates a paging occasion consisting of the at least one beam, and monitors a paging in the paging occasion. When the paging occasion consists of the multiple beams including the at least one beam, the paging may be monitored in a part of the paging occasion where the at least one beam is transmitted. Alternatively, when the paging occasion only consists of the at least one beam, the paging may be monitored in all of the paging occasion where the at least one beam is transmitted.

A method and apparatus for providing half-duplex communications for a Very Small Aperture Terminal (VSAT) operating on a continuous received stream is disclosed. The method includes: decoding the continuous received stream to establish synchronization with the continuous received stream; locating, in the continuous received stream, a time plan including a receiving timeslot and a transmitting timeslot; demodulating the continuous received stream by adapting to a timing and frequency variation of the continuous received stream in the receiving timeslot, freewheeling the adapting of the continuous received stream during the transmitting timeslot, and resuming the adapting of the continuous received stream when the transmitting timeslot ends; stopping a receiving of the continuous received stream during the transmitting timeslot; and transmitting from the VSAT during the transmitting timeslot. The freewheeling includes saving a signal acquisition parameter at the start of the transmitting timeslot and restoring the saved signal acquisition parameter at the end of the transmitting timeslot.

A method for transmitting data from a population of devices to a relay station travelling with respect to one another. For transmitting the data to the relay station, each device includes at least one transmission slot resulting from a channel access method and a transmission window within which the relay station is to travel. The relay station is to broadcast an instruction to the population of devices before the data transmission, and, upon receiving the instruction, at least part of the population of devices is to set a modified transmission slot.

Various embodiments provide a relay transmission method, where a first node is a parent node of a second node. In those embodiments, a request message from the first node can be received by the second node, where the request message is configured to request the second node to become a parent node of the first node. Still in those embodiments, indication information can be sent, by the second node, to the first node, where the indication information is used to indicate that a downlink beam sent from the second node to the first node after the second node becomes the parent node is the same as or similar to an uplink beam sent from the second node to the first node when the first node is the parent node. The indication information may be carried in a response message for the request message.

Method and apparatus efficiently signal and use resources for wireless communications supporting circuit switched (CS) and packet switched sessions (PS). Signaling and interaction between the wireless transmit/receive unit (WTRU), and various network entities, such as the Mobility Management Entity (MME), the Visitor Location Register (VLR), and Base Stations (BS), are used to implement circuit switched fall back (CSFB) in a PS system.