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).

A method of conducting bit error rate testing of an electronic device under test using a bit error rate tester (BERT) includes configuring the BERT with one or more of jitter, noise, and timing settings to derive a desired receiver stressed eye diagram; connecting the electronic device under test to the BERT via an inter-symbol interference channel that introduces delays for creation of the desired receiver stressed eye diagram at the electronic device under test; the BERT placing the electronic device under test into a loopback mode whereby data transmitted to the electronic device under test by the BERT is transmitted back to the BERT for comparison to the data transmitted to the electronic device under test; the BERT transmitting a data pattern into the electronic device under test; and the BERT comparing the data pattern transmitted to the electronic device under test by the BERT to data received back from the electronic device under test during the loopback mode to detect a bit error rate.

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.

This disclosure provides methods and apparatuses for repeated transmissions. One method includes: determining, by a terminal device, a plurality of receive beams to be used by a terminal device for receiving at least two transmissions of a transport block; and receiving, by the terminal device, the at least two transmissions of the transport block by using the plurality of receive beams determined by the terminal device.

This application provides a channel state information transmission method, an access network device, and a terminal device. The method includes: receiving, by an access network device, CSI reported by a terminal device, where the CSI includes a first PMI and a second PMI; and determining, by the access network device based on the first PMI and the second PMI, a precoding matrix W whose rank is greater than or equal to 2, where W meets W=W.sub.1W.sub.2, and the second PMI is used to indicate some column vectors in W.sub.2. According to the method in the embodiment, overheads of feeding back the CSI by the terminal device are effectively reduced.

A method is provided in a receiving node for handling status information of data units transmitted from a sending node to the receiving node over a radio link. The receiving node establishes that a number of data units that has been transmitted by the sending node are missing. The receiving node sends a reduced status message to the sending node over the radio link, which message is reduced such that it comprises the negative acknowledgement for a first part of missing data units and omits negative acknowledgements for the rest of the missing data units. The omitted negative acknowledgement for the rest of the missing data units will not erroneously be interpreted as correctly received data units by the sending node.

A method is provided in a receiving node for handling status information of data units transmitted from a sending node to the receiving node over a radio link. The receiving node establishes that a number of data units that has been transmitted by the sending node are missing. The receiving node sends a reduced status message to the sending node over the radio link, which message is reduced such that it comprises the negative acknowledgement for a first part of missing data units and omits negative acknowledgements for the rest of the missing data units. The omitted negative acknowledgement for the rest of the missing data units will not erroneously be interpreted as correctly received data units by the sending node.

Aspects of the disclosure relate to wireless communication devices configured to encode information blocks to produce code blocks and interleave the code blocks utilizing an interleaver including a plurality of rows and a plurality of columns, where the number of columns of the interleaver varies between the rows. In some examples, the interleaver includes a right isosceles triangle-shaped matrix of rows and columns. In other examples, the interleaver includes a trapezoid-shaped matrix of rows and columns.

A wireless device and an Access and Mobility Management Function (AMF) and methods performed by a wireless device and an AMF, respectively.