METHOD AND APPARATUS FOR REFERENCE SYMBOL RECEPTION
First Claim
Patent Images
1. A method of receiving data at a communications device from a wireless communications network, the method comprising:
- receiving data symbols transmitted from the wireless communications network at the communications device 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,the wireless access interface 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 receiving the data symbols comprisesreceiving the data symbols from a first subset of resource elements in one or more of the radio frames, andreceiving common reference symbols from a second subset of resource elements in each radio frame, the common reference symbols having been transmitted with a first transmission power and the data symbols having been transmitted via the virtual carrier with a second transmission power, and wherein the method further comprisesreceiving specific reference symbols which have been transmitted via the resource elements of said virtual carrier at the second transmission power;
determining a difference in power between the second transmission power and the first transmission power, andif the difference in power substantially exceeds a threshold, generating channel estimates using only the specific reference symbols received from the virtual carrier.
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Abstract
To facilitate a selective transmission power boost in a narrowband subsystem of a wideband host carrier, where 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. It is further determined whether to use the dedicated symbols exclusively or in addition to common reference symbols to generate channel estimates.
10 Citations
7 Claims
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1. A method of receiving data at a communications device from a wireless communications network, the method comprising:
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receiving data symbols transmitted from the wireless communications network at the communications device 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, the wireless access interface 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 receiving the data symbols comprises receiving the data symbols from a first subset of resource elements in one or more of the radio frames, and receiving common reference symbols from a second subset of resource elements in each radio frame, the common reference symbols having been transmitted with a first transmission power and the data symbols having been transmitted via the virtual carrier with a second transmission power, and wherein the method further comprises receiving specific reference symbols which have been transmitted via the resource elements of said virtual carrier at the second transmission power; determining a difference in power between the second transmission power and the first transmission power, and if the difference in power substantially exceeds a threshold, generating channel estimates using only the specific reference symbols received from the virtual carrier. - View Dependent Claims (2, 3, 4, 5)
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6. A communications device for generating channel estimates from data received from an infrastructure equipment forming part of a wireless communications network, the device comprising:
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a receiver unit which operates to receive data 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 a controller configured to control the receiver unit to receive, 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 the controller in combination with the receiver unit are configured to receive data symbols in a first subset of the resource elements in one or more of the radio frames, and to receive common reference symbols in a second subset of the resource elements in each radio frame, said second subset having a first transmission power; and wherein the data symbols in the virtual carrier have been transmitted at a second transmission power, wherein the controller in combination with the receiver unit are further configured to receive specific reference symbols that are transmitted at the second transmission power in the resource elements of the virtual carrier; and wherein the controller is further configured to determine a difference in power between the second transmission power and the first transmission power, and, if the difference in power substantially exceeds a threshold, to generate channel estimates for frequencies within the first section using only the specific reference symbols.
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7-8. -8. (canceled)
Specification