Method and equipment for identifying a logical channel
View Patent ↗A method and an equipment implementing the method that allow a logical channel, to which a received burst relates, to be identified with certainty also in demanding operational circumstances. A logical channel relating to a time slot is identified by applying channel decoding. The identification can be a primary identification or a confirming identification taking place after a primary identifier the time slot comprises, preferably a bit map, has been interpreted. If identification based on channel decoding contradicts identification based on the bit map, a receiver can be arranged to indicate logical channel information on the basis of the channel decoding, for instance by changing the bit map, when selected criteria are met, to a bit map conforming to the logical channel identified on the basis of the channel decoding. The invention significantly improves the performance of a receiver of a mobile communications system because a considerable part of misinterpretations relating to the logical channel are avoided.
1. A method for ensuring that stealing is detected in a time slot or a time slot part, the time slot including a training sequence that indicates stealing, the method comprising:
reading of said training sequence from the received time slot,
channel decoding, in response to stealing being indicated by said training sequence, a first time slot block by applying a channel decoding method relating to stealing;
channel decoding, in response to the channel decoding of said first block failing when the channel decoding method relating to stealing is applied, a second time slot block by applying a channel decoding method relating to stealing;
interpreting, in response to the channel decoding of both the first and the second block failing when the channel decoding method relating to stealing is applied, the time slot to comprise traffic channel data; and
arranging, in response to the channel decoding of both the first and the second block failing when the channel decoding method relating to stealing is applied, a training sequence indicating a traffic channel as the training sequence.
2. The method of claim 1 , further comprising interpreting, in response to the channel decoding of the latter time slot block succeeding when the channel decoding method relating to stealing is applied, said time slot as a whole to comprise control channel data.
3. A receiver functioning in a radio system, the receiver comprising a unit performing channel decoding, the unit being arranged to:
read from a received time slot a training sequence indicating stealing;
channel decode, in response to stealing being indicated by said training sequence, a first time slot block by applying a channel decoding method relating to stealing;
channel decode, in response to the channel decoding of said first block failing when the channel decoding method relating to stealing is applied, a second time slot block by applying the channel decoding method relating to stealing;
interpret, in response to the channel decoding of both the first and the second block failing when the channel decoding method relating to stealing is applied, the time slot to include traffic channel data,
wherein the unit is arranged to change, in response to the channel decoding of both the first and the second block failing when the channel decoding method relating to stealing is applied, a training sequence indicating a traffic channel as the training sequence.
4. The receiver of claim 3 , wherein the unit is arranged to interpret, in response to the channel decoding of the latter time slot block succeeding when the channel decoding method relating to stealing is applied, said time slot as a whole to include control channel data.
5. A channel decoding unit for connection to a receiver in a radio system, the unit being configured to:
read from a received time slot a training sequence indicating stealing;
channel decode, in response to stealing being indicated by said training sequence, a first time slot block by applying a channel decoding method relating to stealing;
channel decode, in response to the channel decoding of said first block failing when the channel decoding relating to stealing is applied, a second time slot block by applying the channel decoding method relating to stealing; and
interpret, in response to the channel decoding relating to both the first and the second block failing when the channel decoding method relating to stealing is applied, the time slot to comprise traffic channel data,
wherein the unit is arranged to change, in response to the channel decoding of both the first and the second block failing when the channel decoding method relating to stealing is applied, a training sequence indicating a traffic channel as the training sequence.
6. The unit of claim 5 , wherein the unit is arranged to interpret, in response to a channel decoding of the latter time slot block succeeding when the channel decoding method relating to stealing is applied, said time slot as a whole to include control channel data.
7. The receiver of claim 3 , wherein the receiver is part of a base station of a mobile communications system.
8. The receiver of claim 3 , wherein the receiver is part of a subscriber terminal of a mobile communications system.
9. A channel decoding unit for connection to a receiver in a radio system, the unit being configured to:
read from a received time slot a training sequence indicating stealing;
channel decode, in response to stealing being indicated by said training sequence, a first time slot block by applying a channel decoding method relating to stealing;
channel decode, in response to the channel decoding of said first block failing when the channel decoding relating to stealing is applied, a second time slot block by applying the channel decoding method relating to stealing; and
interpret, in response to the channel decoding relating to both the first and the second block failing when the channel decoding method relating to stealing is applied, the time slot to comprise traffic channel data,
wherein the unit is arranged to interpret, in response to a channel decoding of the latter time slot block succeeding when the channel decoding method relating to stealing is applied, said time slot as a whole to comprise control channel data.
10. The unit of claim 5 , wherein the unit is part of a base station of a mobile communication system.
11. The unit of claim 5 , wherein the unit is part of a subscriber terminal of a mobile communication system.