Method for transmitting subscriber-specific data
View Patent ↗During the transmission of subscriber-specific data, particularly via a transfer medium and according to a transmission principle based on time slot transmission with time slot separation, the transfer medium used by several subscribers can also be efficiently used when the data rates of the data transmitted in the transmission direction (SRI) and the reception direction (ERI) for at least one subscriber using the transmission are differently, i.e. asymmetrically distributed. To this end, the data to be transmitted for each subscriber are transmitted, as in the case of a symmetric data distribution, in at least two time slots (ZS) per a periodically returning time frame (ZR, ZR 1, ZR 6 ) and corresponding to the asymmetrical distribution of the ratio of a number of transmission data packets (SDP) to reception data packets (EDP) in a plurality n half time frame of the time frame (ZR, ZR 1 ZR 6 ) with n being greater or equal to 2 or ε N.
1. A method for transmitting subscriber-specific data by a communication system in time slots with time slot separation, comprising:
combining the time slots for transmission into a periodically recurring time frame such each subscriber having data transmitted in a time frame has at least two time slots assigned to the time frame;
asymmetrically transmitting data for each subscriber in a transmit direction and a receive direction with a distribution ratio determined according to a ratio of transmit data packets to receive data packets; and
transmitting data for the subscriber in a plurality “n” of half time frames of the time frames, where n≧2 and n∈N,
wherein the time slots are selected from the group consisting of half-slot time slots, full-slot time slots and double-slot time slots,
wherein a shortened full-slot time slot referred to as a short slot is used for full-slot time slot transmission,
a shortened double-slot time slot referred to as a long-slot time slot is used for double-slot time slot transmission,
each shortened full slot time slot and each shortened double-slot time slot contains a synchronization field, a data field and a control field,
the data field in the shortened full-slot time slot is shortened compared with an unshortened full-slot time slot,
the data field in a shortened double-slot time slot is shortened compared to an unshortened double-slot time slot,
the size of the data field is variable in the shortened full slot time slot and the shortened double-slot time slot, and
the control field is at least as long as required for a carrier signal frequency change to be carried out regardless of how quickly a carrier signal frequency for transmitted data can be changed.
2. The method for transmitting subscriber-specific data as claimed in claim 1 , wherein
the plurality “n” of half time frames of the time frames used for distribution of transmit data packets and receive data packets in proportional to a delay time, and
the plurality “n” is limited so that the delay time has no disruptive influence on data transmission.
3. The method for transmitting subscriber-specific data as claimed in claim 1 , wherein air is used as a transmission medium.
4. The method for transmitting subscriber-specific data as claimed in claim 3 , wherein a DECT radio interface is used for wireless data transmission.
5. The method for transmitting subscriber-specific data as claimed in claim 4 , wherein the time slots are assigned to the time frame in pairs, and
the distance from the beginning of the first time slot of the time slot pair to the beginning of a second time slot of the time slot pair is equal to the length of half a time frame.
6. The method for transmitting subscriber-specific data as claimed in claim 1 , wherein
152 bits are allocated to the half-slot time slot in the data field,
264 bits are allocated to the shortened full-slot time slot in the data field,
392 bits are allocated to the full-slot time slot in the data field,
744 bits are allocated to the shortened double-slot time slot in the data field, and
872 bits are allocated to the double-slot time slot in the data field.
7. The method for transmitting subscriber-specific data as claimed in claim 1 , wherein
the plurality “n” of half time frames of the time frames used for distribution of transmit data packets and receive data packets is proportional to a delay time, and
the plurality “n” is limited so that the delay time has no disruptive influence on data transmission.
8. The method for transmitting subscriber-specific data as claimed in claim 7 , wherein a DECT radio interface is used for wireless data transmission.
9. The method for transmitting subscriber-specific data as claimed in claim 8 , wherein the time slots are assigned to the time frame in pairs, with the interval for the time slot pair being the length of half a time frame.
10. The method for transmitting subscriber-specific data as claimed in claim 9 , wherein
152 bits are allocated to the half-slot time slot in the data field,
264 bits are allocated to the shortened full-slot time slot in the data field,
392 bits are allocated to the full-slot time slot in the data field,
744 bits are allocated to the shortened double-slot time slot in the data field, and
872 bits are allocated to the double-slot time slot in the data field.