How to Reduce Unexpected eMBMS Session Disconnection: Design and Performance Analysis

Tsung Yen Chan*, Yi Ren, Yu-Chee Tseng, Jyh-Cheng Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


In 3GPP evolved multimedia broadcast/multicast service (eMBMS), sometimes sessions will be disconnected unexpectedly due to the miss of session keys. Although rekeying can prevent old users from getting multicast data, it also causes authorized users to miss subsequent data if they miss the key update messages. Thus, re-authentication is needed to obtain lost keys from key management mechanism. We point out this problem in our previous work. In this letter, we further propose a new KeySet algorithm, which can pre-issue a number of keys to users when they join eMBMS. The advantage is that a user can still decode multicast data even if it misses some key updates tentatively. However, the cost is that allowing some old users to freely enjoying multicast. In this letter, we quantify the tradeoff and derive the optimal case.

Original languageEnglish
Pages (from-to)126-129
Number of pages4
JournalIEEE Wireless Communications Letters
Issue number1
StatePublished - 1 Feb 2018


  • LTE broadcast
  • multimedia broadcast and multicast service (MBMS)
  • performance analysis
  • quality of experience (QoE)

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