RANDOM ACCESS BURST TRANSMISSION SCHEME
An apparatus for transmitting and receiving signals in a wireless telecommunication system and to a method for transmitting random access bursts in such an apparatus. The apparatus includes a transmitter for transmitting random access bursts, a receiver for receiving acknowledgement information confirming a successful transmission of a random access burst, a decision unit for deciding if acknowledgement information has been received, and a control unit for randomly choosing a time point for an attempt to retransmit said random access burst from an interval if no acknowledgement information has been received after a random access burst had been transmitted.
1 . An apparatus for transmitting and receiving signals in a wireless telecommunication system, the apparatus comprising:
a transmitter configured to transmit a random access burst;
a receiver configured to receive acknowledgement information confirming a successful transmission of said random access burst;
a decision unit configured to decide if acknowledgement information has been received; and
a controller configured to randomly choose a timepoint for an attempt to retransmit said random access burst from an interval if no acknowledgement information has been received after said random access burst has been transmitted, wherein the controller is configured to set a length of said interval depending on a number of unsuccessful attempts to transmit said random access burst.
2 . The apparatus of claim 1 , wherein said interval length is set longer when the number of unsuccessful attempts increases.
3 . The apparatus of claim 2 , wherein said interval length depends exponentially on the number of unsuccessful attempts.
4 . The apparatus of claim 1 , wherein the controller is configured to randomly choose said timepoint for a retransmission attempt after a predetermined offset time has elapsed.
5 . The apparatus of claim 1 , wherein said controller is configured to choose a timepoint for a retransmission attempt if it is determined that the number of unsuccessful attempts is lower than a predetermined maximum number of unsuccessful attempts.
6 . The apparatus of claim 1 , wherein said interval length is set depending on a priority class of the random access burst.
7 . The apparatus of claim 6 , wherein said interval length is set shorter for higher priority classes.
8 . The apparatus of claim 1 , wherein said interval is represented by a series of numbers representing time slots in the wireless telecommunication system.
9 . A method for transmitting random access bursts in an apparatus for transmitting and receiving signals in a wireless telecommunication system, the method comprising:
transmitting a random access burst;
deciding if acknowledgement information confirming a successful transmission of said random access burst has been received; and
randomly choosing a timepoint for an attempt to retransmit said random access burst from an interval if no acknowledgement information has been received, wherein a length of said interval is set depending on a number of unsuccessful attempts to transmit said random access burst.
10 . The method of claim 9 , wherein said interval length is set longer when the number of unsuccessful attempts increases.
11 . The method of claim 10 , wherein said interval length depends exponentially on the number of unsuccessful attempts.
12 . The method of claim 9 , wherein said timepoint for a retransmission attempt is randomly chosen after a predetermined offset time has elapsed.
13 . The method of claim 9 , wherein said timepoint for a retransmission attempt is only chosen if it is determined that the number of unsuccessful attempts is lower than a predetermined maximum number of unsuccessful attempts.
14 . The method of claim 9 , wherein said interval length is set depending on a priority class of the random access burst.
15 . The method of claim 14 , wherein said interval is set shorter for higher priority classes.
16 . The method of claim 9 , wherein said interval is represented by a series of numbers representing time slots in the wireless telecommunication system.
17 . An apparatus for transmitting and receiving signals in a wireless telecommunication system, the apparatus comprising:
transmitting means for transmitting a random access burst;
receiving means for receiving acknowledgement information confirming a successful transmission of said random access burst;
decision means for deciding if acknowledgement information has been received; and
control means for randomly choosing a timepoint for an attempt to retransmit said random access burst from an interval if no acknowledgement information has been received after said random access burst has been transmitted, wherein the control means sets a length of said interval depending on a number of unsuccessful attempts to transmit said random access burst.