Relay apparatus and method for relaying a data packet

Abstract

A relay apparatus for relaying a data packet to be transmitted from a first partner transceiver to a second partner transceiver having a receive unit for receiving the data packet and for receiving an acknowledgement packet to be transmitted from the second partner transceiver to the first partner transceiver when the second partner transceiver has successfully received the data packet. The relayapparatus further having a help detector for providing a help indicator if a help necessitated situation is detected and a transmit unit for transmitting the data packet in response to the help indicator. The help necessitated situation is detected based on whether a first communication link between the relay apparatus and the second partner transceiver is better than a second communication link between the first and second partner transceivers, the second communication link being evaluated by an information being available from the data packet.

Description

technical field [0001] The present invention relates to the field of wireless networks, where networks are considered to have a fixed infrastructure, ad hoc or multi-hop networks, and hybrids thereof, also known as wireless local area networks, wireless mesh networks or wireless multi-hop networks. Background technique [0002] Reliable and fast communication between terminals and their associated Access Points (APs) is one of the key issues in any Wireless Local Area Network (WLAN), in order to avoid wasting power on retransmissions and will share radio channels traffic is reduced to a minimum. In fact, multiple retransmissions are a waste of valuable energy usually provided by the battery on the terminal, and retransmissions also make the use of radio resources inefficient and cause Communication blocked. Transmitters in WLANs based on the IEEE 802.11 specification adjust their modulation schemes and coding rates to suit the current channel conditions to maximize throug...

AI Technical Summary

Problems solved by technology

Reasons for unsuccessful calculation of the frame check sequence at the access point AP are, for example: poor channel conditions, i.e. generated bit errors; or packet collisions by two or more terminals transmitting simultaneously

Another point of failure is the calculation of the acknowledged frame check sequence at terminal S1, which may also fail due to poor channel conditions and resulting bit errors, or due to colliding transmissions. select

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