Panasonic Corporation

Junya Yamazaki

Katsuyoshi Naka

Daichi Imamura

Masayuki Hoshino

Atsushi Sumasu

Pek Yew Tan

Tomohiro Imai

Ryohei Kimura

Hiroki Haga

Rahul Malik

Hidenori Kayama

A base station, a mobile station and a retransmission control method for enabling communication to be more efficiently performed. In a communication system comprising a base station () and a mobile station (), a time period required for the retransmission of a transport packet to complete is determined, and a retransmission control is performed, based on the required time period, to change the order of executing the retransmission of the transport packet and a handover. In this way, when it is estimated that the retransmission will complete soon, the retransmission is caused to complete in a handover source system, thereby avoiding waste of communication resources used in the preceding transmission and retransmission processes. When it is estimated that the retransmission will continue for a while, the communication resources used in the preceding transmission and retransmission processes are wasted, but a more appropriate MCS can be assigned, in a handover destination system, so as to perform a retransmission, thereby enabling communication to be efficiently performed.

Retransmission control method, base station and mobile station

An interleave apparatus and an interleave method for preventing an increase in the number of retransmissions to improve the throughput. In a wireless communication apparatus having the interleave apparatus, a data holding part () two-dimensionally arranges and holds bit sequences. A first index calculating part () sequentially calculates first indexes to be used for reading, in a column direction, the bit sequences arranged in a row direction. A second index calculating part () sequentially calculates second indexes to be used for reversing the order of the upper-order and lower-order bits to be read from the even-numbered columns when the bit sequences are read in accordance with the first indexes. A third index calculating part () sequentially calculates third indexes to be used for reading the bit sequences from a different start position in accordance with the number of retransmissions. A reading part () reads the bit sequences in the order that is in accordance with the third indexes. A mapping part () maps the read bit sequences to the respectively corresponding subcarriers.

Interleave apparatus and interleave method

The invention includes methods for achieving efficient channel access in a wireless communications system. The invention is embodied in a wireless network adapter that is present in all stations belonging to the network. The invention describes methods by which access overheads may be reduced by introducing the concept of context sensitive frame timing&#x2014;using which stations redefine and interpret frame timing depending on context and signaling. The result of realizing the invention is an improvement in medium utilization efficiency and consequently, an overall improvement in network throughput.

Method for reducing medium access overhead in a wireless network

Growing community of inventors

Kanagawa, Japan

Junya Yamazaki