RLC Bitmap Super Field (BITMAP-SUFI)
The BITMAP SUFI consists of the following fields: Type identifier field(BITMAP) LENGTH Filed First Sequence Number(FSN) Bitmap The BITMAP SUFI fields in the STATUS PDU are as follows: Type = BITMAP LENGTH FSN Bitmap LENGTH The LENGTH is a 4 bits long field. The LENGTH field signifies the size of bitmap in octets. The size of bitmap in octets = LENGTH + 1 So if, LENGTH = 0000 = 0 Size of bitmap = 0 + 1 = 1 octet FSN FSN is the sequence number of the first bit in the bitmap. FSN is 12 bits long. Bitmap In bitmap each bit position signifies whether FSN + bit_position is correctly received or not. bit_position can have two different values: 1 Sequence Number = (FSN + bit_position) has been correctly received. 0 Sequence Number = (FSN + bit_position) has not been correctly received. Example Suppose the receiver needs to send [...]
Categories: RLC Tags:
Flexible RLC PDU Size (Release 7)
Flexible RLC PDU Size was interdicted in Release 7 in order to decrease RLC protocol overhead and to avoid sequence number stalling Flexible RLC is used with MAC-ehs in Release 7. Mac-ehs is a new feature interdicted in Release 7 to increase the downlink throughput.
Categories: RLC Tags:
UMTS Radio Link Protocol Decoder
UMTS-RLCDecoder is small but powerful tool for decoding RLC header information both for Acknowledged Mode RLC PDUs and Unacknowledged Mode RLC PDUs.
It Can decode the following
- RLC AMD PDU Header and Length Indicator
- RLC Control PDUs including SUFIs
- RLC UMD PDU header and Length Indicator
UMTS RLC Status PDU: SUFI RLIST
The STATUS PDU is used to exchange status information between two RLC AM entities. In this tutorial following topics are discussed:
- What is SUFI RLIST?
- Different fields in the SUFI RLIST
- Example with encoding details
UMTS RLC Status PDU: SUFI LIST
This tutorial describes the UMTS RLC SUFI LIST. In this tutorial following topics are discussed:
- What is SUFI LIST?
- Different fields in the SUFI
- Example with encoding details
UMTS RLC Status PDU: SUFI NO_MORE & SUFI ACK
The STATUS PDU is used to exchange status information between two RLC AM entities. In this tutorial following topics are discussed:
- Why STATUS PDU is required?
- Status PDU Parameters
- Different type of SUFIs
- SUFI ACK described with an example
UMTS: RLC Length Indicator (RLC LI)
The Length Indicator is used to indicate, each time, the end of an SDU occurs in the PDU. The Length Indicator points out the number of octets between the end of the last Length Indicator field and up to and including the octet at the end of an SDU segment. This tutorial gives detail description about RLC AM and UM data PDU encoding.
