systemoverviewofhiperlantype2

systemoverviewofhiperlantype2内容摘要：

st CONTROL information concerning the whole radio cell, . broadcast RLC message, MAC ID in the association process, encryption seed, etc. – DCCH (Dedicated Control Channel): used in downlink, direct link and uplink conveying RLC messages – LCCH (Link Control CHannel): used bidirectional to transmit ARQ and discard messages between peer error control functions – UDCH (User Data CHannel): used bidirectional to transmit user data doc.: IEEE Submission July 2020 Jamshid KhunJush, Ericsson Slide 16 MAC Frame Channels: Transport Channel • Logical channels are mapped onto different transport channels which describe the basic message format and are the basic elements for constructing message sequence of each user – BCH (Broadcast CHannel): carries BCCH transmitted once per MAC frame per sector antenna – FCH (Frame CHannel): used in downlink for carring FCCH with variable amount of data – ACH (Access feedback CHannel): used in downlink for transporting RFCH – LCH (Long Transport CHannel): used for transporting user data and control information – SCH (Short CHannel): used for transporting short control information – RCH (Random CHannel): used in uplink for transmitting resource request or association request doc.: IEEE Submission July 2020 Jamshid KhunJush, Ericsson Slide 17 Mapping between Logical and Transport Channels BC C H FCC H R F C H L C CH R BC H D C CH U D C H UB C HU M CHBC H F C H A C H S C H LCHL CH• Downlink UD C H DC C H L C C H A S C H L C H S C H R C H• Uplink doc.: IEEE Submission July 2020 Jamshid KhunJush, Ericsson Slide 18 Basic MAC Frame Structure • A single sector system • A multiple sectors system MAC F ra m e MAC F ra m e MAC F ra m e MAC F ra m eBC H 1 BC H 2 BC H N F C H 1 F C H 2 F C H 2 UL 1 UL 2 UL nBC H n q RCHs 1DL pAC 1 F C H n DL 1AC H nD i L 1 D i L 2 D i L m i f D i L i s p re s e n tRCHs 2 RCHs nB CH FCH DL ph ase UL ph ase RCHsM A CF ram e M A CF ram e M A CF ram eA CHSC H SC H LCH LCH SC H LCHDL t o on e M TOne D LC con n ecti o nOne P D U tra i n (to be m ap pe d on o n e P H Y bu rs t)doc.: IEEE Submission July 2020 Jamshid KhunJush, Ericsson Slide 19 DLC: Error Control • Scaleable Error Control: three EC modes – Acknowledged mode for reliable transmission by using ARQ – Repetition mode for reliable transmission by repeating LCHs – Unacknowledged mode for transmissions with low latency • SRARQ with partial bitmap – retransmission efficiency as conventional SR – Optimized overhead and delay for acknowledgements • acknowledgements are sent not for every erroneous packet but a bitmap for several ones • Dynamical management of bitmap packets • Cumulative Acknowledgement and Flow Control possible – Discarding capability • efficient for real time applications • Short MAC frame (2 ms) allows retransmission even for voice doc.: IEEE Submission July 2020 Jamshid KhunJush, Ericsson Slide 20 Partial Bitmap Basics • Numbering of PDU from 0 to 1023 (Sequence Number) • Grouping 8 PDUs into 1 Block, totally 127 Blocks • ACK of a PDU: BitMap Block (BMB) amp。 BitMap Number (BMN) • In the ARQ CPDU: 3 BMBs amp。 3 BMNs • BMN1=Block_Id1, BMN2=Block_Id1 Block_Id2, BMN3=Block_Id3 Block_Id2 SN = 0Bl o ck _ I d0SN =5 1 2Bl o ck _ I d 6 4SN =7 6 8Bl o ck _ I d 9 6BMN 1 = 3 3BMN 2 = 8SN =2 5 6Bl o ck 3 2BMB2=1 0 1 1 1 1 1 1BMB1=1 1 0 1 1 1 1 1BMN 3 = 3 0BMB3=1 1 1 0 1 1 1 1SN =5 7 1SN =3 3 0SN =2 6 5ARQ Mes s age Format ( Upl i nk )8 7 6 5 4 3 2。