TVWS Power saving (TVWSPS) This subclause defines a scalable and symmetrical power saving model for a wide range of LR-WPAN applications operating in TVWS. A TVWS device may be either an initiating device or a responding device. A responding device switches on its receiver during periodic listening periods each with listening macTVWSPSListeningInterval duration macTVWSPSListeningDuration. In between listening periods, the responding device may be in sleep mode with the receiver disabled. To poll the responding device, an initiating device transmits frames containing a TVWS power saving (TVWSPS) IE followed by a channel listening period at for total duration or until receiving an macTVWSPSPollingInterval, macTVWSPSPollingDuration acknowledgement frame, whichever occurs first. The value of macTVWSPSPollingInterval should be less than or equal to macTVWSPSListeningDuration and macTVWSPSPollingDuration should be more than or equals to macTVWSPSListeningInterval. The TVWSPS IE may be included in an enhanced beacon, data or multi-purpose frame. An initiating or responding device may also indicate the required time for completing the transaction in the transaction duration field of the generated TVWSPS IE. When generating the TVWSPS ID, the Rendezvous time field shall be set to the value of macTVWSPSRendezvousTime and the Transaction duration field shall be set to the value of macTVWSPSTransDuration. Upon receiving a with a TVWSPS IE, the responding device switches on an ad-hoc listening period to receive the data from the initiating device at the Rendezvous time indicated in the received TVWS IE, and transmits the data requested by the initiating device at indicated rendezvous time. Two illustrative examples of the TVWSPS protocol is given in Figure 12. In the first example the initiating device 1 has pending data to transmit to the responding device. In the second, Initiating device 2 is requesting data from the responding device. Figure : TVWS Power Saving Example MAC frame formats Format of individual frame types Beacon frame format 5.2.2.1.1a Information elements (IEs) field
TVWS Power saving (TVWSPS) This subclause defines a scalable and symmetrical power saving model for a wide range of LR-WPAN applications operating in TVWS. A TVWS device may be either an initiating device or a responding device. A responding device switches on its receiver during periodic listening periods macTVWSPSListeningInterval each with listening duration macTVWSPSListeningDuration. In between listening periods, the responding device may be in sleep mode with the receiver disabled. To poll the responding device, an initiating device transmits frames containing a TVWS power saving (TVWSPS) IE followed by a channel listening period at macTVWSPSPollingInterval, for total duration macTVWSPSPollingDuration or until receiving an acknowledgement frame, whichever occurs first. The value of macTVWSPSPollingInterval should be less than or equal to macTVWSPSListeningDuration and macTVWSPSPollingDuration should be more than or equals to macTVWSPSListeningInterval. The TVWSPS IE may be included in an enhanced beacon, data or multi-purpose frame. An initiating or responding device may also indicate the required time for completing the transaction in the transaction duration field of the generated TVWSPS IE. When generating the TVWSPS ID, the Rendezvous time field shall be set to the value of macTVWSPSRendezvousTime and the Transaction duration field shall be set to the value of macTVWSPSTransDuration. Upon receiving a with a TVWSPS IE, the responding device switches on an ad-hoc listening period to receive the data from the initiating device at the Rendezvous time indicated in the received TVWS IE, and transmits the data requested by the initiating device at indicated rendezvous time. Two illustrative examples of the TVWSPS protocol is given in Figure 12. In the first example the initiating device 1 has pending data to transmit to the responding device. In the second, Initiating device 2 is requesting data from the responding device. Figure : TVWS Power Saving Example MAC frame formats Format of individual frame types Beacon frame format 5.2.2.1.1a Information elements (IEs) field