This base station is provided with: a control circuit which determines information to be set in a signal for notifying a number of data allocations in a retransmission process, on the basis of a setting relating to feedback for the retransmission process; and a transmission circuit for transmitting the information in the signal.

Methods and systems are provided for allocating resources including VoIP (voice over Internet Protocol) and Non-VoIP resources. In some embodiments, multiplexing schemes are provided for use with OFDMA (orthogonal frequency division multiplexing access) systems, for example for use in transmitting VoIP traffic. In some embodiments, various HARQ (Hybrid Automatic request) techniques are provided for use with OFDMA systems. In various embodiments, there are provided methods and systems for dealing with issues such as Handling non-full rate vocoder frames, VoIP packet jitter handling, VoIP capacity increasing schemes, persistent and non-persistent assignment of resources in OFDMA systems.

Methods and systems are provided for allocating resources including VoIP (voice over Internet Protocol) and Non-VoIP resources. In some embodiments, multiplexing schemes are provided for use with OFDMA (orthogonal frequency division multiplexing access) systems, for example for use in transmitting VoIP traffic. In some embodiments, various HARQ (Hybrid Automatic request) techniques are provided for use with OFDMA systems. In various embodiments, there are provided methods and systems for dealing with issues such as Handling non-full rate vocoder frames, VoIP packet jitter handling, VoIP capacity increasing schemes, persistent and non-persistent assignment of resources in OFDMA systems.

An object of the present invention is to increase speed of retransmission. A communication device has a transmission unit, a reception unit, a comparison unit, and a retransmission control unit. The transmission unit transmits first data toward a communication party. The reception unit receives second data as the first data received and returned by the communication party. The comparison unit is a process unit in a data link layer and compares the transmitted first data with the received second data. The retransmission control unit is a process unit in the data link layer and, when the transmission first data and the received second data do not match as a result of the comparison by the comparison unit, controls retransmission of the first data.

An object of the present invention is to increase speed of retransmission. A communication device has a transmission unit, a reception unit, a comparison unit, and a retransmission control unit. The transmission unit transmits first data toward a communication party. The reception unit receives second data as the first data received and returned by the communication party. The comparison unit is a process unit in a data link layer and compares the transmitted first data with the received second data. The retransmission control unit is a process unit in the data link layer and, when the transmission first data and the received second data do not match as a result of the comparison by the comparison unit, controls retransmission of the first data.

An embodiment of the invention relates to a method of operating a communication system (10) that comprises at least four communication nodes (A, B, C, D). The communication system is operated in a time-division multiplexing technique wherein the communication is carried out in consecutive time frames which are divided into slots. At least one slot is allocated to each of the communication nodes. Each of the slots comprises, or preferably consists of, at least two consecutive sub-slots, hereinafter referred to as transmission sub-slot (TSS1-TSS4) and echo sub-slot (ESS1-ESS4). Echo signals (E (DS1)-E (DS4)) are transmitted during echo sub-slots (ESS1-ESS4).

An embodiment of the invention relates to a method of operating a communication system (10) that comprises at least four communication nodes (A, B, C, D). The communication system is operated in a time-division multiplexing technique wherein the communication is carried out in consecutive time frames which are divided into slots. At least one slot is allocated to each of the communication nodes. Each of the slots comprises, or preferably consists of, at least two consecutive sub-slots, hereinafter referred to as transmission sub-slot (TSS1-TSS4) and echo sub-slot (ESS1-ESS4). Echo signals (E (DS1)-E (DS4)) are transmitted during echo sub-slots (ESS1-ESS4).

The present application relates to a base station, user equipment, and an adaptive retransmission method. The base station includes a sending unit, configured to send a data packet to user equipment by using a radio resource on a first frequency band, The base station also includes a receiving unit, configured to receive feedback information sent by the user equipment, where the feedback information is used to indicate whether the data packet is successfully sent. The sending unit is further configured to, if the feedback information indicates that the data packet fails to be sent, send the data packet to the user equipment by using a radio resource on a second frequency band. The first frequency band and the second frequency band have an overlapping coverage area, and the user equipment is within the overlapping coverage area.

The present application relates to a base station, user equipment, and an adaptive retransmission method. The base station includes a sending unit, configured to send a data packet to user equipment by using a radio resource on a first frequency band, The base station also includes a receiving unit, configured to receive feedback information sent by the user equipment, where the feedback information is used to indicate whether the data packet is successfully sent. The sending unit is further configured to, if the feedback information indicates that the data packet fails to be sent, send the data packet to the user equipment by using a radio resource on a second frequency band. The first frequency band and the second frequency band have an overlapping coverage area, and the user equipment is within the overlapping coverage area.

A fault tolerant communication protocol transmits information across a communication channel from a transmitting device to a receiving device. The receiving device echoes back a copy of the transmitted information to the transmitting device. The transmitting device sends a first valid signal across the communication channel if the echoed information matches the transmitted information. The receiving device sends a second valid signal across the communication channel responsive to the first valid signal. The transmitting device stops sending of the first valid signal responsive to the second valid signal and the receiving device stops sending the second valid signal responsive to determining the first device has stopped sending the first valid signal. The receiving device can then update its state based on a successful transfer.