Method of transmission in a UMTS mobile telephone network enabling preparation for handover to a GSM cell during a call in a UMTS cell
First Claim
1. A method of transmission in a UMTS mobile telephone network enabling preparation for handover to a GSM cell during a call in a UMTS cell, the method comprising transporting information in frames each made up of a plurality of time slots, wherein the time slots from each frame being allocated to mobile telephone terminals for communication via the UMTS mobile telephone network, the method further comprising allocating time slots in each frame to a given mobile telephone terminal in such a manner that, at intervals equal to an integer multiple of the duration of a frame, no time slot is allocated to the given mobile telephone terminal for at least one continuous series of time slots whose total duration is at least equal to a predetermined time period, wherein the continuous series of time slots not allocated to the given mobile telephone terminal is used for reception of a broadcast control channel from the GSM cell and pre-synchronization to the GSM cell.
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Accused Products
Abstract
During allocation of time slots of a UMTS frame to a terminal, the UMTS network provides a continuous gap having a duration at least equal to 5 ms in a UMTS frame to enable the receiver of the terminal to measure the power of any GSM signals received and to prepare for possible handover by pre-synchronizing to an adjoining GSM cell.
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Citations
31 Claims
- 1. A method of transmission in a UMTS mobile telephone network enabling preparation for handover to a GSM cell during a call in a UMTS cell, the method comprising transporting information in frames each made up of a plurality of time slots, wherein the time slots from each frame being allocated to mobile telephone terminals for communication via the UMTS mobile telephone network, the method further comprising allocating time slots in each frame to a given mobile telephone terminal in such a manner that, at intervals equal to an integer multiple of the duration of a frame, no time slot is allocated to the given mobile telephone terminal for at least one continuous series of time slots whose total duration is at least equal to a predetermined time period, wherein the continuous series of time slots not allocated to the given mobile telephone terminal is used for reception of a broadcast control channel from the GSM cell and pre-synchronization to the GSM cell.
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7. A mobile telephone terminal that receives information transported in a plurality of UMTS frames, each UMTS frame comprising a plurality of time slots, wherein the mobile telephone terminal prepares to continue a call from a UMTS cell in a GMS cell by:
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receiving a series of UMTS frames, wherein each UMTS frame has time slots allocated to the mobile telephone terminal in such a manner that, at intervals equal to an integer multiple of the duration of a UMTS frame, no time slot is allocated to the mobile telephone terminal for at least one continuous series of time slots whose total duration is at least equal to a predetermined time period; and
using the continuous series of time slots not allocated to the mobile telephone terminal to prepare to continue the call in the GSM cell by receiving a broadcast control channel from the GSM cell and pre-synchronizing to the GSM cell. - View Dependent Claims (8, 9)
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10. A UMTS cell that transports information in a plurality of UMTS frames, each UMTS frame comprising a plurality of time slots, wherein the UMTS cell allows a mobile telephone terminal to prepare to continue a call from the UMTS cell in a GMS cell by:
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allocating at least a portion of the time slots in each of the UMTS frames to the mobile telephone terminal in such a manner that, at intervals equal to an integer multiple of the duration of a UMTS frame, no time slot is allocated to the mobile telephone terminal for at least one continuous series of time slots whose total duration is at least equal to a predetermined time period, wherein the continuous series of time slots not allocated to the mobile telephone terminal is used for reception of a broadcast control channel from the GSM cell and pre-synchronization to the GSM cell; and
transmitting the UMTS frames to the mobile telephone terminal. - View Dependent Claims (11, 12, 13, 14)
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15. A UMTS mobile telephone network including at least one UMTS cell and at least one mobile telephone terminal, wherein information is transported between UMTS cell and the mobile telephone terminal in a plurality of UMTS frames, each UMTS frame comprising a plurality of time slots, the network prepares to handover a call from the UMTS cell to a GMS cell by:
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allocating time slots to a given mobile telephone terminal in such a manner that, at intervals equal to an integer multiple of the duration of a UMTS frame, no time slot in each of the UMTS frames is allocated by the UMTS cell to the mobile telephone terminal for at least one continuous series of time slots whose total duration is at least equal to a predetermined time period;
transmitting the UMTS frames containing the allocated time slots to the mobile telephone terminal; and
preparing to continue the call in the GSM cell, wherein the mobile telephone terminal uses the unallocated continuous series of time slots to receive a broadcast control channel from the GSM cell and to pre-synchronize to the GSM cell to prepare for handover to the GSM cell. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method of transmission in a UMTS mobile telephone network, wherein information is transported in a plurality of UMTS frames, the UMTS frames being allocated to mobile telephone terminals for communication via the UMTS mobile telephone network such that a series of UMTS frames is equal to the time duration of a GMS multiframe and the time duration of individual UMTS frames is equal to a predetermined time period, the method further comprises:
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allocating, at intervals equal to an integer multiple of the duration of a UMTS frame, all but a portion of one UTMS frame within the series of UMTS frames to the mobile telephone terminals; and
using the unallocated UMTS frame portion to prepare to handover a call from a UMTS cell to a GSM cell for reception of a broadcast control channel from the GSM cell and pre-synchronization to the GSM cell. - View Dependent Claims (22)
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24. A mobile telephone terminal that receives information transported in a series of UMTS frames that are equal in duration to a GMS multiframe, the UMTS frames being allocated to mobile telephone terminals for communication via the UMTS mobile telephone network such that a series of UMTS frames is equal to the time duration of a GMS multiframe and the time duration of individual UMTS frames is equal to a predetermined time period, wherein the given mobile telephone terminal prepares to continue a call from a UMTS cell in a GMS cell by:
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receiving a series of UMTS frames, wherein at least a portion of a single UMTS frame in the series of UMTS frames is not allocated to the mobile telephone terminal; and
using the portion of the single UMTS frame not allocated to the given mobile telephone terminal to prepare to continue the call in the GSM cell, wherein the given mobile telephone terminal uses the portion of the single UMTS frame not allocated to the given mobile telephone terminal to receive a broadcast control channel from the GSM cell and to pre-synchronize to the GSM cell. - View Dependent Claims (23, 25)
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26. A UMTS cell that transports information in a plurality of UMTS frames, the UMTS frames being allocated to mobile telephone terminals for communication via the UMTS mobile telephone network such that a series of UMTS frames is equal to the time duration of a GMS multiframe and the time duration of individual UMTS frames is equal to a predetermined time period, the UMTS cell allowing mobile telephone terminals to prepare to continue a call from the UMTS cell in a GMS cell by:
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allocating, at intervals equal to an integer multiple of the duration of a UMTS frame, all but a portion of one UTMS frame within the series of UMTS frames to the mobile telephone terminals, wherein the continuous series of time slots not allocated to the mobile telephone terminals is used for reception of a broadcast control channel from the GSM cell and pre-synchronization to the GSM cell; and
transmitting the series of UMTS frames to the mobile telephone terminals. - View Dependent Claims (27, 28)
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29. A UMTS mobile telephone network including at least one UMTS cell and at least one mobile telephone terminal, wherein information is transported in a plurality of UMTS frames, the UMTS frames being allocated to mobile telephone terminals for communication via the UMTS mobile telephone network such that a series of UMTS frames is equal to the time duration of a GMS multiframe and the time duration of individual UMTS frames is equal to a predetermined time period, the network prepares to handover a call from the UMTS cell to a GSM cell by:
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allocating, at intervals equal to an integer multiple of the duration of a UMTS frame, all but a portion of a single UMTS frame within the series of UMTS frames to the mobile telephone terminals for communication; and
using the frame portion not allocated to the mobile telephone terminals to prepare to continue a call from the UMTS cell in the GSM cell, wherein the mobile telephone terminals use the frame portion not allocated to the mobile telephone terminals to receive a broadcast control channel from the GSM cell and to pre-synchronize to the GSM cell. - View Dependent Claims (30, 31)
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Specification