초록 ▼

An arrangement where, in addition to the control channels that are used to set up sessions, there is a logically and physically separate and independent set of control channels that can be used as session control channels. Illustratively, the physical GSM frame arrangement that employs 8 logical slo

An arrangement where, in addition to the control channels that are used to set up sessions, there is a logically and physically separate and independent set of control channels that can be used as session control channels. Illustratively, the physical GSM frame arrangement that employs 8 logical slots is used, with one slot both in the uplink and downlink dedicated to these separate control channels. In the downlink, such a control channel provides channel grant information, requests to make and transmit power measurements, poll mobile units, etc. In the uplink, such a control channel can be used to request access to a traffic channel, to report on power measurements, to request special hand-off handling, to respond to polling, etc. Because the uplink session control channel does not need to carry a significant amount of information, the GSM slot can be divided into minislots, with each minislot constituting a session control channel for a group of mobile units.

대표청구항 ▼

An arrangement where, in addition to the control channels that are used to set up sessions, there is a logically and physically separate and independent set of control channels that can be used as session control channels. Illustratively, the physical GSM frame arrangement that employs 8 logical slo

An arrangement where, in addition to the control channels that are used to set up sessions, there is a logically and physically separate and independent set of control channels that can be used as session control channels. Illustratively, the physical GSM frame arrangement that employs 8 logical slots is used, with one slot both in the uplink and downlink dedicated to these separate control channels. In the downlink, such a control channel provides channel grant information, requests to make and transmit power measurements, poll mobile units, etc. In the uplink, such a control channel can be used to request access to a traffic channel, to report on power measurements, to request special hand-off handling, to respond to polling, etc. Because the uplink session control channel does not need to carry a significant amount of information, the GSM slot can be divided into minislots, with each minislot constituting a session control channel for a group of mobile units. gnal strength of the base station which is in service with pilot signal strengths of the neighboring base stations; and a third sub-step of distinguishing a pilot signal strength of a predetermined level among the pilot sigaal strengths of the neighboring base stations if the pilot signal strength of the base station which is in service is smaller than the pilot signal strengths of the neighboring base stations, and determining whether a sector having the found sector belongs to the base station which is currently in service; and a second step of obtaining handoff between sectors in the base station which is currently in service if the found sector belongs to the base station in service, while obtaining handoff into sectors in the neighboring base station if the found sector does not belong to the base station in service. 4. A handoff method of a mobile communications system according to claim 3, wherein the pilot signal strength of the predetermined level in the third sub-step is larger than a sum of the pilot signal strength of the base station which is in service and the threshold value. l.; US-4764915, 19880800, Efron et al.; US-4766583, 19880800, Oinoue et al.; US-4769803, 19880900, Yamamiya; US-4774699, 19880900, Giddi