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 use in a Global System for Mobile Communication (GSM)/Enhanced Data Rates for Global Evolution (EDGE) Radio Access Network (GERAN) compliant wireless transmit/receive unit (WTRU), the method comprising:
receiving a first data block associated with a downlink temporary block flow (TBF), wherein the first data block includes a first header that includes a temporary flow identity (TFI) that identifies the downlink TBF;
generating a piggybacked acknowledgement/non-acknowledgement (PAN) field corresponding to the downlink TBF;
generating a PAN check sequence (PCS) based on the PAN field;
masking a subset of PCS bits with the TFI to generate a masked PCS;
generating a second data block, associated with an uplink TBF, that includes a second header, a data part corresponding to the uplink TBF, the PAN field, and the masked PCS; and
transmitting the second data block.
2. The method of claim 1 , wherein the subset of PCS bits is 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 Global System for Mobile Communication (GSM)/Enhanced Data Rates for Global Evolution (EDGE) Radio Access Network (GERAN) compliant wireless transmit/receive unit (WTRU) comprising:
a receiver configured to receive a first data block associated with a downlink temporary block flow (TBF), wherein the first data block includes a first header that includes a temporary flow identity (TFI) that identifies the downlink TBF;
a processor configured to:
generate a piggybacked acknowledgement/non-acknowledgement (PAN) field corresponding to the downlink TBF;
generate a PAN check sequence (PCS) based on the PAN field;
mask a subset of PCS bits with the TFI to generate a masked PCS; and
generate a second data block, associated with an uplink TBF, that includes a second header, a data part corresponding to the uplink TBF, the PAN field, and the masked PCS; and
a transmitter configured to transmit the second data block.
5. The WTRU of claim 4 , wherein the subset of PCS bits is a first N bits of the PCS bits, or a last N bits of the PCS bits.
6. The WTRU of claim 4 , wherein the processor is further configured to generate the PCS by performing cyclic redundancy check (CRC) encoding with the PAN field.
7. A method for use in a Global System for Mobile Communication (GSM)/Enhanced Data Rates for Global Evolution (EDGE) Radio Access Network (GERAN) compliant wireless transmit/receive unit (WTRU), the method comprising:
transmitting a first data block associated with an uplink temporary block flow (TBF), wherein the first data block includes a first header that includes a temporary flow identity (TFI) that identifies the uplink TBF;
receiving a second data block associated with a downlink TBF, wherein the second data block includes a header, a data part corresponding to the downlink TBF, a piggybacked acknowledgement/non-acknowledgement (PAN) field corresponding to the uplink TBF, and a masked PAN check sequence (PCS), wherein the masked PCS was masked with the TFI that identifies the uplink TBF; and
de-masking the masked PCS using the TFI that identifies the uplink TBF.
8. The method of claim 7 , wherein the de-masking further comprises: de-masking the masked PCS using all TFIs identifying all TBFs associated with the WTRU.
9. The method of claim 7 , wherein the de-masking further comprises: performing cyclic redundancy check (CRC) decoding with the PAN field.
10. A Global System for Mobile Communication (GSM)/Enhanced Data Rates for Global Evolution (EDGE) Radio Access Network (GERAN) compliant wireless transmit/receive unit (WTRU) comprising:
a transmitter configured to transmit a first data block associated with an uplink temporary block flow (TBF), wherein the first data block includes a first header that includes a temporary flow identity (TFI) that identifies the uplink TBF;
a receiver configured to receive a second data block associated with a downlink TBF, wherein the second data block includes a header, a data part corresponding to the downlink TBF, a piggybacked acknowledgement/non-acknowledgement (PAN) field corresponding to the uplink TBF, and a masked PAN check sequence (PCS), wherein the masked PCS was masked with the TFI that identifies the uplink TBF; and
a processor configured to de-mask the masked PCS using the TFI that identifies the uplink TBF.
11. The WTRU of claim 10 , wherein the processor is further configured to de-mask the masked PCS using all TFIs identifying all TBFs associated with the WTRU.
12. The WTRU of claim 10 , wherein the processor is further configured to de-mask the masked PCS by performing cyclic redundancy check (CRC) decoding with the PAN field.