Call control method for handoff guarantee in mobile terminal

A call control method for handoff guarantee in a mobile terminal, the method comprising the following steps of:

• (a) judging whether the requested minimum bandwidth of handoff is allocable within the currently reserved bandwidth to allocate the requested minimum bandwidth if allocable, when a received handoff call requests the maximum and minimum bandwidths used in a previous call from a base station of a destination cell of the mobile terminal;
• (b) if not allocable, judging whether the available bandwidth exists in the unreserved bandwidth of the current cell to approve the corresponding call if available and regulate the corresponding call to stand by in a handoff queue if unavailable;
• judging whether the standby time of the handoff call in the handoff queue exceeds the maximum allowable handoff expiration time to approve the handoff call if not exceeds and block the handoff call if exceeds;
• allocating the minimum one of the requested maximum bandwidth and the added value of the reserved bandwidth and the available bandwidth in the unreserved bandwidth of the cell;
• and
• requesting a bandwidth reservation from an adjacent cell and requesting a previous base station of the handoff call to cancel the bandwidth reserved to a previously adjacent cell.

A record medium readable by a digital processing device recording a tangibly embodied program of instructions executable by the digital processing device to perform a call control method for handoff guarantee in a mobile terminal, wherein the program is executed in the following steps of:

• judging whether the requested maximum bandwidth is allocable within the available bandwidth of the current cell when a received new call requests the maximum and minimum bandwidths;
• if the requested maximum bandwidth is allocable within the available bandwidth of the current cell, requesting handoff from an adjacent cell into the current cell and inspecting a handoff queue to judge whether a standby call exists in the handoff queue;
• if the standby call does not exist in the handoff queue, approving the new call;
• and
• requesting a bandwidth reservation from the adjacent cell after allocating the minimum one of the requested maximum bandwidth and the available bandwidth of the cell to an application which currently requests call set-up about the approved call.

A record medium readable by a digital processing device recording a tangibly embodied program of instructions executable by the digital processing device for performing a call control method for handoff guarantee in a mobile terminal, wherein the program is executed in the following steps of:

• (a) judging whether the requested minimum bandwidth of handoff is allocable within the currently reserved bandwidth to allocate the requested minimum bandwidth if allocable, when a received handoff call requests the maximum and minimum bandwidths used in a previous call from a base station of a destination cell of the mobile terminal;
• (b) if not allocable, judging whether the available bandwidth exists in the unreserved bandwidth of the current cell to approve the corresponding call if available and regulate the corresponding call to stand by in a handoff queue if unavailable;
• judging whether the standby time of the handoff call in the handoff queue exceeds the maximum allowable handoff expiration time to approve the handoff call if not exceeds and block the handoff call if exceeds;
• allocating the minimum one of the requested maximum bandwidth and the added value of the reserved bandwidth and the available bandwidth in the unreserved bandwidth of the cell;
• and
• requesting a bandwidth reservation from an adjacent cell and requesting a previous base station of the handoff call to cancel the bandwidth reserved to a previously adjacent cell.