Traffic driven channel reservation system for handovers in cellular networks
First Claim
1. A method of allocating channels to mobile subscribers entering a handover region extending between the boundary of first and second adjacent cells of a cellular network, each of said cells having channels provided therein for call allocation and having a pre-handover zone defined therein proximate the handover region, said method comprising the steps of:
- determining a number of mobile subscribers traversing the pre-handover zone of said first cell;
determining a number of mobile subscribers within the handover region awaiting a free channel in said second cell;
determining a number of free channels available in said second cell; and
blocking a new call involving a subscriber within said second cell to reserve a channel for a subscriber traversing said pre-handover zone based on a relationship between the number of Subscribers determined to be traversing the pre-handover zone of said first cell, the number of subscribers determined to be in the handover region awaiting a free channel, and the number of channels determined to be available in said second cell.
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Accused Products
Abstract
A method is disclosed for reducing handover failure probability in cellular networks which includes the steps of determining whether a mobile subscriber is traversing a pre-handover zone defined in each cell of the network, reserving a free channel in an adjacent cell for the mobile subscriber traversing the pre-handover zone, and granting the free channel to the mobile subscriber upon entering a handover region extending across the boundary of the adjacent cells provided that a free channel is available at such a time, and in the alternative, if a free channel is not available at such a time, the handover request is queued until a free channel becomes available.
56 Citations
15 Claims
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1. A method of allocating channels to mobile subscribers entering a handover region extending between the boundary of first and second adjacent cells of a cellular network, each of said cells having channels provided therein for call allocation and having a pre-handover zone defined therein proximate the handover region, said method comprising the steps of:
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determining a number of mobile subscribers traversing the pre-handover zone of said first cell; determining a number of mobile subscribers within the handover region awaiting a free channel in said second cell; determining a number of free channels available in said second cell; and blocking a new call involving a subscriber within said second cell to reserve a channel for a subscriber traversing said pre-handover zone based on a relationship between the number of Subscribers determined to be traversing the pre-handover zone of said first cell, the number of subscribers determined to be in the handover region awaiting a free channel, and the number of channels determined to be available in said second cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A cellular network comprising:
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a) a plurality of adjoining cells having boundaries extending therebetween and each having channels provided therein for call allocation; b) a handover region extending across the boundary of adjacent cells wherein on-going calls of mobile subscribers are transferred from one cell to another cell; c) a pre-handover zone defined in each of said plurality of adjoining cells proximate the handover region associated therewith; d) means for determining a number of mobile subscribers traversing the pre-handover zones within each of said adjoining cells; e) means for determining a number of mobile subscribers within the handover zones awaiting free channels; and f) means for blocking new calls involving subscribers of a given cell to reserve channels for subscribers traversing said pre-handover zones based upon a relationship between the number of free channels in said given cell, the number of subscribers within the handover region of said given cell, and the number of subscribers traversing the pre-handover zone of at least one adjacent cell to said given cell. - View Dependent Claims (10, 11, 12)
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13. In a cellular network having a plurality of cells each defined by a respective boundary, and handover regions extending across the boundaries of adjacent cells, the improvement therewith comprising:
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a pre-handover zone defined in each of said cells proximate the handover region associated therewith within which free channels are reserved in an adjacent cell for mobile subscribers traveling theretoward; means for determining a number of mobile subscribers traversing the pre-handover zones within each of said adjacent cells; means for determining a number of mobile subscribers within the handover zones awaiting free channels; and means for blocking new calls involving subscribers of a given cell to reserve channels for subscribers traversing said pre-handover zones based upon a relationship between the number of free channels in said given cell, the number of subscribers within a handover region of said given cell, and the number of subscribers traversing the pre-handover zone of at least one adjacent cell to said given cell. - View Dependent Claims (14, 15)
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Specification