According to Wu[l], system performance and capacity degrade due to the co-channel interference between microcells (i.e. hot-spot) and macrocells in a hierarchical structure if the same channel is used. In order to avoid co-channel interference, different channels are assigned for macrocells and microcells. That means multi channels exist in the hierarchical structure. However, hard handoff is necessary for a mobile station (MS) across the boundary of microcell and macrocell because both of them use different channels. Based on a hot-spot overlaying environment, this paper proposes multi-channel access schemes to avoid serious interference between hot-spot and macrocell and thus the capacities are increased. Besides, the same channel can be used in macrocell and hot-spot simultaneously. It makes soft handoff workable and improves the system performance.
|Number of pages||8|
|Journal||IEICE Transactions on Communications|
|State||Published - 1998|
- Hard handoff
- Soft handoff