OFDM based wireless communication using flexible resources
A method of transmitting data by a communications device to a wireless communications network comprising determining, by the communications device, from granted uplink communications resources, OFDM symbols of one or more time slots which are designated for transmitting uplink data, and transmitting the uplink data in the OFDM symbols determined as designated for uplink transmission. The determining the OFDM symbols of the one or more time slots which are designated for transmitting uplink data includes identifying one or more F-symbols of the one or more time slots designated for transmitting the uplink data based on information received with an indication of the communications resources of the uplink.
1. A method of transmitting data by a communications device to a wireless communications network, the method comprising:
receiving by the communications device an uplink grant including an indication of communications resources in one or more time-slots of a wireless access interface provided by the wireless communications network for transmitting uplink data, the one or more time-slots each including communications resources comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols designated as uplink symbols for the communications device to transmit the uplink data, downlink symbols in which an infrastructure equipment transmits signals and the communications device does not transmit the uplink data or flexible symbols which are configurable as either designated as corresponding to the uplink symbols or corresponding to the downlink symbols,
determining, by the communications device, from the indication of the communications resources, OFDM symbols of the one or more time-slots which are designated for transmitting the uplink data, and
transmitting the uplink data in the OFDM symbols determined as designated for uplink transmission,
wherein the determining the OFDM symbols of the one or more time slots which are designated for transmitting uplink data includes identifying one or more of the flexible symbols of the one or more time-slots which are usable for transmitting the uplink data based on information received in the indication of the communications resources for transmitting the uplink data, the information including an explicit indicator indicating the one or more flexible symbols of the one or more time-slots which are usable for transmitting the uplink data, the explicit indicator being in addition to a slot format indicator (SFI).
2. The method of transmitting according to claim 1 , wherein the indication of the communications resources received by the communications device for transmitting the uplink data is one of a configured grant of semi-statically configured resources or a dynamic grant of communications resources provided by a downlink control information message providing the uplink grant.
3. The method of transmitting according to claim 2 , wherein the uplink grant includes a downlink control information message providing a dynamic grant of communication resources in the uplink for the communications device to transmit the uplink data, and the identifying the one or more of the flexible symbols of the one or more time-slots which are usable for transmitting the uplink data is based on information received in the downlink control message.
4. The method of transmitting according to claim 3 , wherein the information received in the downlink control information message granting the communications resources of the uplink includes a slot format combination identifier providing an explicit indication of the one or more flexible symbols which are designated as uplink symbols.
5. The method of transmitting according to claim 3 , wherein the information received in the downlink control information message granting the communications resources of the uplink comprises a bitmap indicating which of the flexible symbols are designated as uplink symbols and which are designated as downlink symbols.
6. The method of transmitting according to claim 3 , wherein the information received in the downlink control information message granting the communications resources of the uplink comprises a bit indicating that all of the flexible symbols of the one or more time-slots are designated as uplink symbols or downlink symbols.
7. The method of transmitting according to claim 3 , wherein the information received in the downlink control information message granting the communications resources of the uplink comprises a bit indicating whether or not any of the flexible symbols of the one or more time-slots of the granted communications resources of the uplink that are usable as uplink symbols or downlink symbols.
8. The method of transmitting according to claim 7 , comprising not transmitting the uplink data in the granted communications resources if the information bit indicates that the flexible symbols is not usable for uplink transmission.
9. The method of transmitting according to claim 3 , wherein the information received in the downlink control information message granting the communications resources of the uplink comprises a bit indicating that implicitly indicates to the communications device that one or more of the flexible symbols are designated as uplink symbols implicitly from communications parameters provided with the uplink grant.
10. The method of transmitting according to claim 3 , wherein the downlink control information message providing the uplink grant of communications resources for transmitting the uplink data includes one or more communications parameters for transmitting the uplink data, and the determining the OFDM symbols of the one or more time slots which are designated for transmitting uplink data comprises determining whether one or more of the flexible symbols are designated for transmitting the uplink data implicitly from the one or more communications parameters.
11. The method of transmitting according to claim 10 , wherein the one or more communications parameters includes an indication of a number of repetitions that the uplink data is to be transmitted in the granted uplink communications resources, and the determining whether one or more of the flexible symbols are designated for transmitting the uplink data comprises comparing the number of repetitions with a predetermined threshold and determining whether the one or more of the flexible symbols are designated for transmitting the uplink data based on the comparison.
12. The method of transmitting according to claim 11 , wherein the predetermined threshold is a first long threshold and the determining whether the one or more of the flexible symbols are designated for transmitting the uplink data in response to the comparison comprises determining that the one or more flexible symbols are designated for transmitting the uplink data if the number of repetitions is greater than the first long threshold.
13. The method of transmitting according to claim 11 , wherein the predetermined threshold is a second short threshold and the determining whether the one or more of the flexible symbols are designated for transmitting the uplink data in response to the comparison comprises determining that the one or more flexible symbols are designated for transmitting the uplink data if the number of repetitions is less than the second short threshold.
14. The method of transmitting according to claim 10 , wherein the one or more communications parameters includes an indication of a number of one or more repetitions that the uplink data is to be transmitted in the granted uplink communications resources and an indication of the number of the OFDM symbols which are to be used for each transmission of the uplink data, and the determining whether one or more of the flexible symbols are designated for transmitting the uplink data comprises determining a total length of time for transmitting all of the repetitions based on a length of each transmission in the one or more time slots of the granted uplink communications resources and comparing the total length of time with a length threshold and determining whether the one or more of the flexible symbols are designated for transmitting the uplink data based on the comparison.
15. The method of transmitting according to claim 14 , wherein a length of time for transmitting the uplink data is a total formed by multiplying the number of repetitions with the number of OFDM symbols for each transmission.
16. The method of transmitting according to claim 14 , wherein a length of time for transmitting the uplink data is a time between a first OFDM symbol of a first transmission and a last OFDM symbol of a last repetition including splitting a repetition to form a plurality of segments to avoid down-link symbols, flexible symbols or a boundary between time slots.
17. The method of transmitting according to claim 1 , wherein the indication of the communications resources received by the communications device for transmitting the uplink data includes one or more communications parameters for transmitting the uplink data, and the determining the OFDM symbols of the one or more time slots which are designated for transmitting uplink data comprises determining whether one or more of the flexible symbols are designated for transmitting the uplink data implicitly from the one or more communications parameters.
18. The method of transmitting according to claim 1 , wherein the uplink grant includes an indication of a configuration of a plurality of the one or more time-slots of the wireless access interface, the time-slots each including communications resources comprising a plurality of OFDM symbols and the configuration of the time-slots designates each of the OFDM symbols as either uplink symbols for the communications device to transmit uplink data, downlink symbols in which transmit signals are transmittable by an infrastructure equipment and uplink data is not transmittable by the communications device or flexible symbols which are configurable by a slot format indicator as either designated as uplink symbols or downlink symbols.
19. A communications device configured to transmit uplink data to a wireless communications network, the communications device comprising:
transmitter circuitry configured to transmit signals representing the uplink data via a wireless access interface provided by the wireless communications network,
receiver circuitry configured to receive signals from the wireless access interface, and
controller circuitry configured to control the transmitter circuitry and the receiver circuitry
to receive an uplink grant including an indication of communications resources in one or more time-slots of a wireless access interface provided by the wireless communications network for transmitting the uplink data, the time-slots each including communications resources comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols designated as uplink symbols for the communications device to transmit uplink data, downlink symbols in which an infrastructure equipment transmit signals and the communications device does not transmit the uplink data or flexible symbols which are configurable as either corresponding to the uplink symbols or corresponding to the downlink symbols,
to determine from the indication of the communications resources, OFDM symbols of the one or more of the time-slots which are designated for transmitting the uplink data, and
to transmit the uplink data in the OFDM symbols determined as designated for uplink transmission,
wherein the determining the OFDM symbols of the one or more of the time slots which are designated for transmitting uplink data includes identifying one or more of the flexible symbols of the one or more of the time-slots which are usable for transmitting the uplink data based on information received in the indication of the communications resources for transmitting the uplink data, the information including an explicit indicator indicating the one or more flexible symbols of the one or more time-slots which are usable for transmitting the uplink data, the explicit indicator being in addition to a slot format indicator (SFI).
20. A method of operating an infrastructure equipment of a wireless communications network to receive uplink data from a communications device, the method comprising:
transmitting to the communications device an uplink grant including an indication of communications resources in one or more time-slots of a wireless access interface provided by the wireless communications network for the communications device to transmit the uplink data, the time-slots each including communications resources comprising a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols designated as uplink symbols for the communications device to transmit uplink data, downlink symbols in which an infrastructure equipment transmits signals and the communications device does not transmit the uplink data or flexible symbols which are configurable as either designated as uplink symbols or downlink symbols, and
receiving the uplink data in the OFDM symbols determined as designated for uplink transmission,
wherein one or more of the flexible symbols of the one or more of the time-slots are indicated as being for use for transmitting the uplink data in the transmitted indication of the communications resources for transmitting the uplink data, and
the transmitted indication includes an explicit indicator indicating the one or more flexible symbols of the one or more time-slots as being used for transmitting the uplink data, the explicit indicator being in addition to a slot format indicator (SFI).