Abstract
A method and apparatus allow for reliable and low-complexity decoding of EGPRS2 communication bursts when RTTI and BTTI equipment operate on the same timeslot(s). Various configurations for the Uplink State Flag (USF) mapping employ adjustable bit swapping of some or all USF channel-coded bits in communication bursts. Configurations that allow for an adjustable use of the symbol mapping stage in the transmitter and receiver to allow for more throughput and/or reduced complexity are also disclosed. Admissible mapping rules are known to the receiver and transmitter and therefore reduce the complexity of decoding this information. In order to increase throughput for EGPRS2 communication bursts RTTI transmissions of different modulation types or EGPRS/EGPRS2 modulation and coding schemes during a BTTI interval are introduced that allow for reliable USF decoding and reduced decoder complexity.
Technologies
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Claim
1. A method of reducing uplink state flag (USF) symbol decoding complexity, the method comprising: generating a radio burst for transmission using a plurality of modulation and coding schemes (MCSs); mapping USF bits of a first of the plurality of MCSs onto the radio burst according to a USF bit mapping scheme of a second of the plurality of MCSs.
2. The method of claim 1, wherein the mapping includes bit swapping USF bits.
3. The method of claim 1, wherein the first of the plurality of MCSs is an enhanced general packet radio service 2 (EGPRS2) MCS and the second of the plurality of MCSs is a EGPRS2 downlink level A or an EGPRS downlink level B scheme.
4. The method of claim 1, wherein the mapping includes positioning USF bits immediately following a training sequence.
5. The method of claim 4 further comprising: encoding the mapped USF bits using one of MCS-I through MCS-4 or one of EGRPS2 downlink level A (DAS)-5 through DAS-9 schemes.
6. The method of claim 1, wherein the mapping is based upon a transmission time interval (TTI) of the radio burst.
7. The method of claim 6, further comprising: determining whether the TTI is a basic TTI (BTTI) or a reduced TTI (RTTI); and mapping USF bits of a first of the plurality of MCSs onto the radio burst according to a USF bit mapping scheme of a second of the plurality of MCSs based on the determination.
8. The method of claim 1, wherein the mapping is signaled to a wireless transmit/receive unit (WTRU) for proper reconstruction.
9. A wireless transmit/receive unit (WTRU) comprising: a receiver configured to receive a radio burst including uplink state flag (USF) bits modulated according to a plurality of modulation and coding schemes (MCSs); and a processor configured to recover USF bits modulated according to a first of the plurality of MCSs using a USF bit mapping scheme associated with a second of the plurality of MCSs
10. The WTRU of claim 9, wherein the USF bit mapping scheme includes bit swapping USF bits
11. The WTRU of claim 9, wherein the first of the plurality of MCSs is an enhanced general packet radio service 2 (EGPRS2) MCS and the second of the plurality of MCSs is a EGPRS2 downlink level A or an EGPRS downlink level B scheme
12. The WTRU of claim 9, wherein the processor is further configured to detect USF bits immediately following a training sequence
13. The WTRU of claim 12, wherein the processor is further configured to decode the USF modulated bits using one of MCS-I through MCS-4 or one of EGRPS2 downlink level A (DAS)-5 through DAS-9 schemes
14. The WTRU of claim 9, wherein the processor is configured to recover the USF bits based upon a transmission time interval (TTI) of the radio burst
15. The WTRU of claim 14, wherein the processor is further configured to: determine whether the TTI is a basic TTI (BTTI) or a reduced TTI (RTTI); and recover USF bits of a first of the plurality of MCSs according to a USF bit mapping scheme of a second of the plurality of MCSs based on the determination
16. The WTRU of claim 9, wherein the receiver is further configured to receive information regarding a MCS used to map the USF bits onto the radio burst
17. A method of reducing uplink state flag (USF) symbol decoding complexity, the method comprising: receiving four bursts on an assigned time slot of a basic transmission time internal (BTTI); determining a first modulation type of the first two bursts; determining a second modulation type of the second two bursts; determining if the first modulation type is identical to the second modulation type; decoding the USF and a radio link control (RLC)/medium access control (MAC) header in response to a positive determination; transmitting uplink data on the uplink channel in response to a positive determination that the decoded USF is an assigned USF; and waiting to receive another radio block in response to a negative determination that the decoded USF is an assigned USF
18. The method of claim 17 further comprising: determining if a combination of the first modulation type and the second modulation type is an allowed combination in response to a negative determination that the first modulation type is identical to the second modulation type; transmitting uplink data on the uplink channel in response to a positive determination that the combination is allowed; and waiting to receive another radio block in response to a negative determination that the combination is allowed
19. The method of claim 18, wherein the allowed combination is received at a wireless transmit/receive unit.
20. The method of claim 18, wherein the allowed combination is based on a preceding reduced transmission time interval (RTTI).
21. The method of claim 20, wherein the allowed combination is further based on a modulation and coding scheme (MCS) of the preceding RTTI.
22. The method of claim 20, wherein the allowed combination is based on a future RTTI.
23. The method of claim 22, wherein the allowed combination is further based on a MCS of the future RTTI.
24. The method of claim 18, wherein the allowed combination is based on a minimum Hamming distance of USF codewords.
25. The method of claim 18, wherein the allowed combination is based on the capabilities of a wireless transmit/receive unit (WTRU).
26. The method of claim 19, wherein the allowed combination is received at the WTRU in a message selected from the group consisting of: a packet downlink assignment message; a multiple temporary block flow (TBF) downlink assignment message; a packet uplink assignment message; a multiple TBF uplink assignment message; a packet timeslot reconfigure message; a multiple TBF timeslot reconfigure message; and a packet coding scheme (CS) release indication message.']
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SUMMARY
ClaimChart-WO2009046028A2-STO
Patent number:WO2009046028A2
Claim Chart Type : SEP Claim Chart
Price: 200 €
Note:
The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.