Patent ID: 8730924
Filing Date: 2014-05-20
Classification: H04L

Abstract:
1. A method, performed in a radio base station operating in a cellular radio communication network, for sending reserved sub-carriers to reduce a peak to average power ratio (PAPR) of a transmitted signal to ensure a sufficient quality of a modulated signal to achieve a high data rate, the method comprising the steps of: selecting a modulation scheme for a Transmission Time Interval (TTI) level; sending information associated with the dynamic activation and de-activation of one or more reserved sub-carriers on a common channel, wherein the common channel is readable by user equipment (UEs) operating in one of an idle and a connected mode; dynamically activating transmission of the reserved sub-carriers in a cell when high modulation quality is to be maintained in a particular TTI; dynamically de-activating transmission of the reserved sub-carriers in a cell when high modulation quality is not required in a particular TTI, such that a bandwidth comprising the reserved sub-carriers can be used to transmit data when the reserved sub-carriers are not needed; wherein sending information associated with the dynamic activation and de-activation of one or more reserved sub-carriers comprises sending a first set of information comprising one or more patterns of the reserved sub-carriers to be used in a cell wherein system information is broadcast on a Broadcast Channel (BCH); and sending a second set of information to user equipment using a downlink shared control channel that carries at least one of physical layer signaling information and Media Access Control (MAC) layer signaling information, the second set of information indicating to the UE whether, in a current TTI, a particular reserved sub-carrier pattern is activated or not activated.