Low-rate data transmission in LTE based satellite ratio interface
AssigneeElectronics and Telecommunications Research Instit
InventorHee Wook Kim
Life of this patent
Estimating the term…
Abstract
Disclosed is a low-rate data transmission method in an LTE based satellite radio interface, which can secure a large number of low-rate data channels which can simultaneously access and increase frequency efficiency while providing compatibility with the existing LTE radio interface through a transmission technique which can secure more link margins in communication between portable terminals (handheld type terminals) without changing a basic LTE transmission frame structure in a satellite system requiring high transmission power.
Claims13
A low-rate data transmission method in a radio interface, the method comprising:
- allocating transmission data to resource elements of a basic transport block to which a spreading code is applied, to be shared by a plurality of target UEs;
- and
- transmitting data based on the spreading code through the basic transport block for signal transmission,
- wherein the plurality of target UEs share the same basic transport block to transmit data by using the corresponding spreading code,
- wherein the allocating includes:
- coding the transmission data with the MN/L (M represents the number of the resource elements (REs) of the basic transport block, L represents the length of the spreading code, and N represents the number of bits per symbol depending on the modulation method) coding size;
- dividing the coded data into an I axis and a Q axis and modulating the divided data by a predetermined modulation method;
- applying the spreading code to the I axis and the Q axis of the modulated data;
- and
- allocating the I axis and Q axis data to which the spreading code is applied, to the respective resource elements.
A low-rate data transmission method in a radio interface, the method comprising:
- allocating transmission data to resource elements of a basic transport block to which a spreading code is applied, to be shared by a plurality of target UEs;
- and
- transmitting data based on the spreading code through the basic transport block for signal transmission,
- wherein the plurality of target UEs share the same basic transport block to transmit data by using the corresponding spreading code
- wherein the method further comprises:
- determining, by a base station, whether a corresponding UE is a UE which is able to transmit a signal by sharing the basic transport block based on the spreading code;
- and
- allocating, by the base station, the existing LTE transport resource block to UEs which are not able to transmit the signal based on the spreading code and allocating the basic transport block for transmitting the signal based on the spreading code to UEs which are able to transmit the signal based on the spreading code to share the basic transport block to allow the plurality of target UEs to transmit data by sharing the basic transport block.
A low-rate data transmission method in a radio interface, the method comprising:
- generating a reference signal for demodulation;
- allocating the reference signal generated to have orthogonality to each other with respect to a plurality of target UEs to resource elements of a basic transport block;
- and
- transmitting the reference signal through the basic transport block for signal transmission,
- in order to transmit data based on the spreading code by allocating transmission data to the resource elements of the basic transport block, coding the transmission data with the MN/L (M represents the number of the resource elements (REs) of the basic transport block, L represents the length of the spreading code, and N represents the number of bits per symbol depending on the modulation method) coding size;
- dividing the coded data into an I axis and a Q axis and modulating the divided data by a predetermined modulation method;
- applying the spreading code to the I axis and the Q axis of the modulated data, and
- allocating the I axis and Q axis to which the spreading code is applied, to the respective resource element,
- wherein the plurality of target UEs share the same basic transport block to transmit data by using a corresponding spreading code.
Dependencies are inferred from the claim text.