[Object] To provide a communication device and a communication method which are capable of achieving both an improvement in reliability of communication in which a frame is transmitted to a plurality of destinations and effective use of wireless communication resources. [Solution] The communication device includes: a communication unit configured to perform communication of a frame. The communication unit transmits a transmission acknowledgment request frame for a transmission acknowledgment response frame including frequency allocation information specifying a transmission frequency of the transmission acknowledgment response frame, and receives the transmission acknowledgment response frame which has undergone frequency division multiplexing, on the basis of the frequency allocation information.

There is provided a communication control system that receives monitoring information from a plurality of wireless terminals, the monitoring information indicating reception powers at each of the plurality of wireless terminals in a case that packets transmitted from other of the plurality of wireless terminals are received at each of the plurality of wireless terminals; and determines a representative wireless terminal from the plurality of wireless terminals based on the collected monitoring information.

The invention relates to an improved transmission protocol for uplink data packet transmission in a communication system. A receiver of a user equipment receives a Fast Retransmission Indicator, referred to as FRI. The FRI indicates whether or not a base station requests a retransmission of a previously transmitted data packet. A transmitter of the user equipment retransmits the data packet using the same redundancy version as already used for the previous transmission of the data packet.

[Object] To provide a mechanism capable of improving the efficiency of wireless communication even in a case in which the sequence numbers of received data units are non-sequential.

[Solution] A wireless communication device including: a processing unit that generates a protocol data unit (PDU) that has sequence information with which a sequence number of a data unit that is determined as being to be resent is specified; and a communication unit that transmits the PDU generated by the processing unit. A wireless communication device including: a communication unit that receives a protocol data unit (PDU) that has sequence information with which a sequence number of a data unit that is determined as being to be resent is specified; and an acquisition unit that acquires the sequence information from the PDU received by the communication unit.

Embodiments of the present invention relate to the communications field, and provide a multicast sending apparatus, a multicast receiving apparatus, and a multicast transmission determining method. The method includes: sending at least one multicast frame to multiple stations in a multicast manner; generating a multicast indication request frame, where the multicast request indication frame includes an identifier of the at least one multicast frame, the multicast indication request frame is used to instruct the multiple stations to send an indication frame within a specified timeslot in a unicast and contention-based manner, and the indication frame includes an identifier of a to-be-retransmitted multicast frame; and sending the multicast indication request frame to the multiple stations in a multicast manner.

A method for managing outbound communications for a contact center includes: detecting, by a processor associated with the contact center, a trigger for transmitting outbound messages to a customer of the contact center, determining, by the processor, a notification strategy for the customer in response to the detected trigger, identifying, by the processor, a contact group designated for the customer, initiating, by the processor, first and second conversations with respectively first and second contacts in the contact group for transmitting first and second outbound communications according to the notification strategy, monitoring, by the processor, progress of the first and second conversations, and modifying, by the processor, a state of the second conversation with the second contact based on the progress of the first conversation with the first contact.

The subject technology provides for block acknowledgment requests and block acknowledgment frames that can be used in conjunction with multicast transmissions that include multiple concurrent streams. Thus, the subject technology reduces the overhead associated with multicast transmissions that include multiple concurrent streams by aggregating the acknowledgments across multiple streams into a block acknowledgment, thereby increasing the effective throughput of such transmissions and overall network efficiency.

The invention relates to a method for communicating messages between a plurality of pieces of user equipment of a set of user equipment via a communication network. The method includes, when a transmitter determines that a last payload message of a series received by a receiver, for which all payload messages preceding it in the series have also been received, is different from the last payload message of the series, rebroadcasting by the sender of the payload messages of the series following the last payload message received by the receiver.

Multicast transmissions do not allow for individual receivers to acknowledge that data was received by each receiver in the network. This is not acceptable for isochronous systems that require specific levels of QoS for each device. A multimedia communications protocol supports using multicast transmissions (one-to-many) in multimedia isochronous systems. A transmitter establishes a Multi-ACKed Multicast protocol within which a group of receiving devices can acknowledge the multicast transmission during a multi-acknowledgment period.

Multicast messaging may be managed in a machine-to-machine/Internet of things context, such as a CoAP network, via the inclusion of server selection criterion in multicast request messages and/or resource directory registration management. Server selection criteria may be explicit or implicit. An explicit criterion may be expressed, for example, as an IP address, a server identifier relative to a group context, or a Bloom filter. An implicit criterion may, for example, relate to the context of the request or the requestor, and include such information as data accuracy, data type, application, operating system, network location, geolocation, resource creation time, and resource update time. Server selection criteria may be maintained by a resource directory and/or via a user interface.