Archive for the ‘UMTS’ Category

January 12th, 2010 by Prashant Panigrahi in Freebies , RLC , Software , UMTS

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
November 4th, 2009 by Prashant Panigrahi in UMTS

UMTS Cell Selection Procedure

Whenever PLMN has been selected by NAS, the UE shall attempt to camp on the selected cell. This tutorial tells how a particular cell is selected.
September 23rd, 2009 by Prashant Panigrahi in RLC , UMTS

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
September 21st, 2009 by Prashant Panigrahi in RLC , UMTS

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
September 21st, 2009 by Prashant Panigrahi in RLC , UMTS

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
September 17th, 2009 by Naveed Mumtaz in UMTS

SRNS Relocation in UMTS Network

SRNS relocation is a procedure used during mobility scenarios when Control of the Serving Radio Network Subsystem (SRNS) is changed to another Radio Network Subsystem (RNS)

In this tutorial following topics are discussed:

  • Relocation Procedure
  • Serving RNS Relocation Procedure
  • Combined Hard Handover and SRNS Relocation Procedure
September 15th, 2009 by Prashant Panigrahi in Security , UMTS

UMTS Security: Entity Authentication

Entity authentication is the procedure of mutual authentication of UE or USIM and the network.

In this tutorial following topics are discussed:

  • What is Entity Authentication?
  • Authentication Vectors Generation
  • Authentication Procedure
  • Message sequence from UE point of view
September 10th, 2009 by Prashant Panigrahi in MAC , UMTS

MAC PDU Structure for non-HSPA Transport Channels

MAC PDU Structure for non-HSPA Transport Channels
This tutorial describes about the MAC PDU structure when HS-DSCH and E-DCH transport channel are not used.

MAC PDUs are also called the MAC Transport Blocks (TB). MAC PDU is a bit string. The MAC PDU is consists of the MAC header and the MAC SDU (RLC PDU)

September 7th, 2009 by Prashant Panigrahi in RLC , UMTS

UMTS: RLC Length Indicator (RLC LI)

UMTS: RLC Length Indicator
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.

September 4th, 2009 by Prashant Panigrahi in Security , UMTS

UMTS Security: User Identity Confidentiality (IMSI, TMSI & P-TMSI)

umts-security-user-identity-confidentiality-imsi-tmsi-p-tmsi
The security architecture in UMTS is divided into four main parts:

  1. User identity confidentiality
  2. Entity authentication
  3. Data integrity
  4. Ciphering or confidentiality

In this tutorial User identity confidentiality is covered.

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