Patent EA-001343-B1 (EA)
Title: Process and base station system for configuring an air interface between a mobile station and a base station in a time division multiplex mobile radio telephone system for packet data transmission
Inventor: MENZEL CRISTIAN
IPC: H04Q7/22
Filed: 1997-11-06
Abstract: 1. Method for configuration of a radio interface between a mobile station (MS) and a base station (BS) of a time-division multiplex mobile radio system for packet data transmission, wherein  - the transmission from a mobile station to the base station is called the uplink direction, and from the base station to a mobile station is called the downlink direction, - a channel (GPRS-K) is formed by at least one time slot (ts, T, A) per time-division multiplex frame (R), wherein 52 cycles of time-division multiplex frame are combined into a macrocycle, - the packet data transmission from a plurality of mobile stations (MS) takes place via the channel  (GPRS-K),  - a time slot (ts, A) for signalling is provided at cyclic intervals in the channel (GPRS-K), characterized in that  - just one time slot (ts, A) for signalling for the uplink direction is allocated by the base station  (BS) to the mobile station (MS) and the mobile station emits in the allocated time slot for signalling, even if the mobile station during the present and the next macrocycles do not transmit any packet data. 2. Method according to claim 1, in which a timing advance of a corresponding mobile station is determined from emissions of the mobile station in the allocated time slot for signalling and the timing advance is transmitted in the time slot for signalling in the downlink direction to the corresponding mobile station. 3. Method according to claim 1 or 2, in which the determination of the timing advance and the determination for the setting the transmission power are carried out independently of one another. 4. Method according to claim 3, in which the determination of the timing advance (TA) and/or the reception level (pb) for the setting the transmission power are additionally determined from the time slots (ts, T) for packet data transmission. 5. Method according to one of the preceding claims, in which in the time slots for signalling in the uplink direction longer types of signalling blocks are used for determined configuration data. 6. Method according to one of the preceding claims, in which the determined configuration data is transmitted in the downlink direction in the time slots for the packet data transmission. 7. Method according to one of the preceding claims, in which the interface configurating, respective to the timing advance, is carried out by the base station without controlling by a control device of the base station. 8. Method according to one of the preceding claims, in which a plurality of the time slots are combined to form a signalling block. 9. Method according to claim 3, in which the time slots for signalling are combined to a predetermined sequence, the remaining time slots are provided for monitoring adjacent cells of the mobile station. 10. Method according to one of the preceding claims, in which a message in the time slots for signalling is provided with an additional identifying and/or is contained in the time slots repeatedly. 11. Method according to one of the preceding claims, in which the packet data transmission is carried out in the two transmission directions independently of one another. 12. Method according to one of the preceding claims, in which the mobile stations for packet data transmission are additionally designated by abbreviated identifiers (id) and, via the time slots (ts, A) for signalling in the downlink direction, one or more time slots (ts, A) for signalling in the uplink direction are allocated to the mobile stations (MS) by means of indicator messages which contain abbreviated identifiers (id) and time slot designations. 13. Method according to one of the preceding claims, in which a self-contained message, which contains the reception level (pm) at the mobile station (MS), is transmitted by a mobile station (MS) per time slot (ts, A) for signalling in the uplink direction. 14. Method according to one of the preceding claims, in which emissions of the mobile station in the allocated time slots for signalling are access blocks with a prolonged previous and/or subsequent protecting interval, a moment of the time emission of which is formed from the predetermined timing advance and value of biasing. 15. Method according to claim 14, in which the value of biasing is selected so that the corresponding with it the distance is greater than the distance which the mobile station can cover at maximum permissible speed between two emissions for determining the timing advance. 16. Method for configuration of a radio interface between a mobile station (MS) and a base station (BS) of a time-division multiplex mobile radio system for packet data transmission, wherein  - the transmission from a mobile station to the base station is called the uplink direction, and from the base station to a mobile station is called the downlink direction, - a channel (GPRS-K) is formed by at least one time slot (ts, T, A) per time-division multiplex frame (R), wherein 52 cycles of time-division multiplex frame are combined into a macrocycle, - the packet data transmission from a plurality of mobile stations (MS) takes place via the channel  (GPRS-K),  - a time slot (ts, A) for signalling is provided at cyclic intervals in the channel (GPRS-K), characterized in that having a control device (BSC) for allocating time slot (ts, A) for signalling to mobile stations, characterized in that the control device (BSC) is designed in such a way that just one time slot (ts, A) for signalling for the uplink direction is allocated to the mobile station in accordance with a sequence which can be predetermined, the allocation is independent and the mobile station emits in the allocated time slot for signalling, even if the mobile station during the present and the next macrocycles do not transmit any packet data.