Method and arrangement in a telecommunication system for handling status information of data units

A receiving side of an Acknowledgement Mode (AM) Radio Link Control (RLC) entity for handling status information of RLC Data Protocol Data Units (PDUs) transmitted from a peer AM RLC entity to the AM RLC entity over a radio link, each RLC Data PDU having a respective Sequence Number (SN), the AM RLC entity comprising at least one processor;

• at least one memory including computer program code which, when executed by the processor, causes the AM RLC entity to:
• determine that a number of RLC Data PDUs transmitted by the peer AM RLC entity are missing at the AM RLC entity;
• generate a STATUS PDU comprising negative acknowledgments for a first part of the missing RLC Data PDUs and omitting negative acknowledgments for the rest of the missing RLC Data PDUs;
• set an ACK_SN field of the STATUS PDU to the SN of the first missing RLC Data PDU for which a negative acknowledgement is omitted from the STATUS PDU;
• and
• send the STATUS PDU from the AM RLC entity to the peer AM RLC entity over the radio link.

A method in a transmitting side of an Acknowledgement Mode (AM) Radio Link Control (RLC) entity for handling status information of RLC Data Protocol Data Units (PDUs) transmitted from the AM RLC entity to a peer AM RLC entity over a radio link, the method comprising:

• transmitting a stream of RLC Data PDUs over the radio link to the peer AM RLC entity, the peer AM RLC entity correctly receiving some of the RLC Data PDUs but missing a number of RLC Data PDUs, each RLC Data PDU having a respective Sequence Number SN);
• receiving a STATUS PDU from the peer AM RLC entity over the radio link, wherein an ACK_SN field of the STATUS PDU is set to the SN of the first missing RLC Data PDU for which a negative acknowledgement is omitted from the STATUS PDU;
• and
• interpreting the STATUS PDU as comprising negative acknowledgments for a first part of the missing RLC Data PDUs, and omitted negative acknowledgments for the rest of the missing RLC Data PDUs.

A transmitting side of an Acknowledgement Mode (AM) Radio Link Control (RLC) entity for handling status information of RLC Data Protocol Data Units (PDUs) transmitted from the AM RLC entity to the peer AM RLC entity over a radio link, the AM RLC entity comprising at least one processor;

• at least one memory including computer program code which, when executed by the processor, causes the AM RLC entity to:
• transmit a stream of RLC Data PDUs over the radio link to the peer AM RLC entity, the peer AM RLC entity correctly receiving some of the RLC Data PDUs but missing a number of the RLC Data PDUs, each RLC Data PDU having a respective Sequence Number (SN);
• receive a STATUS PDU from the peer AM RLC entity over the radio link, wherein an ACK_SN field of the STATUS PDU is set to the SN of the first missing RLC Data PDU for which a negative acknowledgement is omitted from the STATUS PDU;
• and
• interpret the STATUS PDU as comprising negative acknowledgments for a first part of the missing RLC Data PDUs, and omitted negative acknowledgments for the rest of the missing RLC Data PDUs.