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US 9,544,859 B2Granted
Method and apparatus for reference symbol transmission
AssigneeSony Corporation
InventorYuichi Morioka
Life of this patent
Estimating the term…
Abstract
To facilitate a selective transmission power boost in a narrowband subsystem of a wideband host carrier, wherein the narrowband subsystem is preferentially allocated to reduced capability communications devices, both data symbols and dedicated reference symbols are transmitted at a higher power within the narrowband. Where the benefits of inserting dedicated reference symbols are outweighed by the loss of data capacity, no dedicated reference symbols are inserted.
Claims16
A method for communicating with a communications device from an infrastructure equipment forming part of a wireless communications network, the method comprising:
- transmitting data to communications devices via a wireless access interface, the wireless access interface providing a plurality of communications resource elements across a system bandwidth, which are divided in time into a plurality of time divided radio frames,
- providing, within the system bandwidth, a first section of communications resource elements within a first frequency bandwidth for allocation preferably to reduced capability communications devices to receive signals representing the data transmitted by the infrastructure equipment within the first frequency bandwidth forming a virtual carrier, the reduced capability communications devices each having a receiver bandwidth which is greater than or equal to the first frequency bandwidth but less than the system bandwidth,
- wherein transmitting data to the communications resources includes
- transmitting data symbols on a first subset of the resource elements in one or more of the radio frames, and
- transmitting common reference symbols on a second subset of the resource elements in each radio frame at a first transmission power;
- and
- wherein the data symbols in said virtual carrier are transmitted on the first subset of resource elements at a second transmission power;
- and the method further comprises
- determining a difference in transmission power between the second transmission power and the first transmission power, and
- if the difference in transmission power substantially exceeds a set threshold, generating specific reference symbols and inserting said specific reference symbols within the virtual carrier in place of one or more of the data symbols, said specific reference symbols having a third transmission power, the third transmission power being greater than the first transmission power.
7 more elements
Infrastructure equipment for communicating with a communications device, said equipment forming part of a wireless communications network and comprising:
- a transmitter configured to transmit data to communications devices via a wireless access interface, the wireless access interface providing a plurality of communications resource elements across a system bandwidth, which are divided in time to form a plurality of time divided radio frames, and
- circuitry configured to control the transmitter to provide, within the system bandwidth, a first section of communications resource elements within a first frequency bandwidth for allocation preferably to reduced capability communications devices to receive signals representing the data transmitted by the transmitter within the first frequency bandwidth forming a virtual carrier, the reduced capability communications devices each having a receiver bandwidth which is greater than or equal to the first frequency bandwidth but less than the system bandwidth, wherein the circuitry in combination with the transmitter are configured
- to transmit data symbols using a first subset of the resource elements in one or more of the radio frames, and
- to transmit common reference symbols via a second subset of the resource elements in each radio frame at a first transmission power;
- wherein the transmitter is configured to transmit the data symbols in said virtual carrier with a second transmission power;
- and the circuitry is configured to determine a difference in transmission power between the second transmission power and the first transmission power, and, if the difference in transmission power substantially exceeds a set threshold, to generate specific reference symbols and to insert said specific reference symbols within the virtual carrier in place of data symbols, said specific reference symbols having a third transmission power, the third transmission power being greater than the first transmission power.
3 more elements
Dependencies are inferred from the claim text.