Managing Interference Correlation Through Random Medium Access
The capacity of wireless networks is fundamentally limited by interference. However, little research has focused on the interference correlation, which may greatly increase the local delay (namely the number of time slots required for a node to successfully transmits a packet). This paper focuses on the question that whether increasing randomness in the MAC, such as Frequency-Hopping Multiple Access (FHMA) and ALOHA, helps to reduce the effect of interference correlation. The authors derive closed-form results for the mean and variance of the local delay for the two MAC protocols and evaluate the optimal parameters that minimize the mean local delay. Based on the optimal parameters, they propose the definitions of two operation regimes: correlation-limited regime and bandwidth-limited regime.