Method and apparatus for indicating a temporary block flow to which a piggybacked acknowledgement/non-acknowledgement field is addressed
A method and apparatus for indicating a temporary block flow (TBF) to which a piggybacked acknowledgement/non-acknowledgement (PAN) field is addressed. A PAN check sequence (PCS) is created, for example using a cyclic redundancy check (CRC) encoding. The PCS is masked with a temporary flow identity (TFI) assigned to a TBF or a mask generated based on the TFI. A data block including the PAN field and the masked PCS is then processed for transmission. The mask may be generated by converting the TFI using an (M, N) code, M being not greater than the number of bits of the PCS and N being the number of bits of the TFI. With this scheme, a TFI may be transmitted in a PAN field without using explicit bits to identify the TBF.
1. A method for indicating a temporary block flow (TBF) to which a piggybacked acknowledgement/non-acknowledgement (PAN) field is addressed, the method comprising:
generating a PAN check sequence (PCS) based on the PAN field;
masking a subset of PCS bits with a temporary flow identity (TFI) of a TBF to which the PAN field is addressed to generate a masked PCS, the TFI being shorter than the PCS bits;
generating a data block including a header, a data part, the PAN field and the masked PCS, wherein the data part and the PAN field are addressed to different TBFs; and
sending the data block.
2. The method of claim 1 wherein the TFI is masked with a first N bits of the PCS bits, or a last N bits of the PCS bits.
3. The method of claim 1 wherein the PCS is generated by performing cyclic redundancy check (CRC) encoding with the PAN field.
4. A method for processing a piggybacked acknowledgement/non-acknowledgement (PAN) field addressing a temporary block flow (TBF), the method comprising:
receiving a data block including a header, a data part, a PAN field and a masked PAN check sequence (PCS), wherein the data part and the PAN field are addressed to different TBFs; and
performing PCS decoding with the PAN field and either the masked PCS or a de-masked PCS to determine a TBF to which the PAN field is addressed, wherein the de-masked PCS is generated by masking the masked PCS bits with a temporary flow identity (TFI) of the TBF to which the PAN field is addressed, and the TFI is shorter than the de-masked PCS.
5. The method of claim 4 wherein the PCS decoding is performed by cyclic redundancy check (CRC) decoding with the received PAN field.
6. An apparatus for indicating a temporary block flow (TBF) to which a piggybacked acknowledgement/non-acknowledgement (PAN) field is addressed, the apparatus comprising:
a PAN check sequence (PCS) generator for processing a PAN field to generate a PCS;
a masking unit for masking a subset of PCS bits with a temporary flow identity (TFI) of a TBF to which the PAN field is addressed to generate a masked PCS, the TFI being shorter than the PCS bits; and
a transceiver for sending a data block including a header, a data part, the PAN field and the masked PCS, wherein the data part and the PAN field are addressed to different TBFs.
7. The apparatus of claim 6 wherein the TFI is masked with a first N bits of the PCS bits, or a last N bits of the PCS bits.
8. The apparatus of claim 6 wherein the PCS bits are generated by performing cyclic redundancy check (CRC) encoding with the PAN field.
9. An apparatus for processing a piggybacked acknowledgement/non-acknowledgement (PAN) field addressing a temporary block flow (TBF), the apparatus comprising:
a transceiver for receiving a data block including a header, a data part, a PAN field and a masked PAN check sequence (PCS), wherein the data part and the PAN field are addressed to different TBFs; and
a PCS decoder for performing PCS decoding with the PAN field and either the masked PCS or a de-masked PCS to determine a TBF to which the PAN field is addressed, wherein the de-masked PCS is generated by masking the masked PCS bits with a temporary flow identity (TFI) of the TBF to which the PAN field is addressed, and the TFI is shorter than the de-masked PCS.
10. The apparatus of claim 9 wherein the PCS decoder is a cyclic redundancy check (CRC) decoder.
11. The method of claim 4 wherein the PCS decoding is performed with a plurality of TFIs to determine the TBF to which the PAN field is addressed.
12. The apparatus of claim 9 wherein the PCS decoder performs the PCS decoding with a plurality of TFIs to determine the TBF to which the PAN field is addressed.