Method and a device for reconfiguration in a wireless system
A method and a device for reconfiguration in a wireless system utilizing flexible layer one (FLO). In proposed solution one TFC (Transport Format Combination) is selected and reserved ( 504 ) exclusively for signalling use. The TFC may contain only one active transport channel and always utilize the same CRC and transport block size in order to unambiguously define the proper settings for signalling. Considering uplink transmission in a wireless system and special case of TFCI (Transport Format Combination Identifier) size change due to the TFCS (Transport Format Combination Set) reconfiguration that also generates a need to switch to a new dedicated basic physical subchannel (DBPSCH); whenever the network notices that the mobile station does not switch to the new DBPSCH ( 518 ), it concludes that the TFCS reconfiguration message sent was lost and stays with the existing configuration ( 520 ). Otherwise the new configuration is taken into use ( 514 ).
1. A method for reconfiguration to be performed in a wireless system utilizing a flexible layer one to transfer data over an air interface, said method comprising transmitting a transport format combination set reconfiguration message to a terminal over a certain basic physical subchannel, said transport format combination set reconfiguration message indicating one transport format combination with a certain transport format combination identifier exclusively for signalling use and the transport format combination relating to exactly one active transport channel with a predetermined block size and cyclic redundancy check size, the method further comprising
when the transport format combination set reconfiguration message indicates a change in the size of transport format combination identifiers, checking a parameter value indicating a change of a basic physical subchannel utilized by the terminal and ordered by a network, and
starting to use a new configuration indicated by the transport format combination set reconfiguration message that indicates the change in the size of transport format combination identifications, otherwise staying with the existing configuration as a result of the checking.
2. A method of claim 1 , wherein said parameter is the change of a basic physical subchannel utilized by the terminal and ordered by the network.
3. A method of claim 1 , wherein said certain identifier is valued zero.
4. A method of claim 1 , wherein said wireless system utilizes a GSM/EDGE radio access network.
5. A method of claim 1 , wherein the one transport format combination with the certain transport format combination identifier indicated by the transport format combination set reconfiguration message is independent of the other transport format combinations indicated by the message.
6. A method of claim 1 , wherein the size of transport format combination identifiers is fixed.
7. A method of claim 6 , wherein the size is fixed to a maximum allowable size.
8. A non-transitory computer readable medium embodying a computer program comprising code to perform the method of claim 1 .
9. An apparatus, comprising: at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: to transmit a transport format combination set reconfiguration message to be delivered to a second device over a certain basic physical subchannel, said transport format combination set reconfiguration message indicating one transport format combination with a certain transport format combination identifier exclusively for signalling use and the transport format combination relating to exactly one active transport channel with a predetermined block size and cyclic redundancy check size, check a parameter value indicating a change of a basic physical subchannel utilized by the second device and ordered by the apparatus, when the transport format combination set reconfiguration message indicates a change in the size of transport format combination identifiers, and start to use a new configuration indicated by the transport format combination set reconfiguration message that indicates the change in the size of transport format combination identifications ,otherwise stay with the existing configuration as a result of the check.
10. The apparatus of claim 9 that is a base station, a base station controller, a combination of a base station and a base station controller, or a mobile station.
11. The apparatus of claim 9 , wherein said device is a base station.
12. The apparatus of claim 9 that is operable in a GSM/EDGE radio access network.
13. A method for reconfiguration in a wireless system utilizing a flexible layer one to transfer data over an air interface, said method comprising receiving a transport format combination set reconfiguration message over a certain basic physical subchannel, said transport format combination set reconfiguration message indicating one transport format combination with a certain transport format combination identifier exclusively for signalling use and the transport format combination relating to exactly one active transport channel with a predetermined block size and cyclic redundancy check size, and utilizing a parameter indicating a change of a basic physical subchannel ordered by a network, and the receiving of the transport format combination set reconfiguration message,
when the transport format combination set reconfiguration message indicates a change in the size of transport format combination identifiers.
14. A method of claim 13 , wherein said parameter is the change of a basic physical subchannel utilized by the terminal and ordered by the network.
15. An apparatus, comprising: at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: a data transfer unit configured to receive a transport format combination set reconfiguration message over a certain basic physical subchannel, said transport format combination set reconfiguration message indicating one transport format combination with a certain transport format combination identifier exclusively for signalling use and the transport format combination relating to exactly one active transport channel with a predetermined block size and cyclic redundancy check size, and utilize a parameter indicating a change of a basic physical subchannel ordered by a network, and receipt of the transport format combination set reconfiguration message,
when the transport format combination set reconfiguration message indicates a change in the size of transport format combination identifiers.
16. The apparatus of claim 15 , wherein said apparatus is a base station or a mobile station.
17. The apparatus of claim 15 that is operable in a GSM/EDGE radio access network.
18. A non-transitory computer readable medium embodying a computer program comprising code to perform the method of claim 13 .