1. A gear train unit with a motor-generator, the gear train unit being arranged in a power transmission path, the gear train unit comprising:
a first planetary gear mechanism having a first sun gear, a first ring gear, and a first carrier;
a second planetary gear mechanism having a second sun gear, a second ring gear, and a second carrier, the second sun gear being connected to the first sun gear;
an input shaft directly connected to the second ring gear;
an output shaft connected to both the first ring gear and the second carrier;
a first clutch that selectively connects and disconnects the first carrier to and from the motor-generator; and
a second clutch that selectively connects and disconnects the first sun gear and the second sun gear to and from the motor-generator.
2. The gear train unit according to claim 1, wherein power transmission modes of the gear train unit include a first power transmission mode, in which the first clutch is disengaged and the second clutch is engaged, and a second power transmission mode, in which the first clutch is engaged and the second clutch is disengaged.
3. The gear train unit according to claim 1, claim 2, wherein the power transmission modes of the gear train unit further include a third power transmission mode, in which the first clutch and the second clutch are both engaged.
4. The gear train unit according to claim 1, wherein the first clutch and the second clutch are arranged inward in a radial direction of the motor-generator.
5. The gear train unit according to claim 1, wherein the first clutch and the second clutch are arranged between the motor-generator and the first planetary gear mechanism.
6. The gear train unit according to claim 1, wherein the motor-generator is a first motor-generator, and wherein the gear train unit further includes a second motor-generator connected to the output shaft.
7. The gear train unit according to claim 6, wherein the second motor-generator is arranged in an outer periphery of the output shaft at an output side of the second planetary gear mechanism.
8. The gear train unit according to claim 6, wherein, when the second motor-generator regenerates electricity, the first clutch and the second clutch are both disengaged.
9. The gear train unit according to claim 1, further comprising a final output shaft arranged at a position closer to an output side than the output shaft, a third planetary gear mechanism, a third clutch, and a brake, wherein the third planetary gear mechanism includes:
a third sun gear;
a third ring gear connected to the output shaft; and
a third carrier connected to the final output shaft,
wherein the third clutch selectively connects and disconnects the third ring gear to and from the third carrier, and
wherein the brake selectively stops rotation of the third sun gear.
10. The gear train unit according to claim 1, further comprising a final output shaft arranged at a position closer to an output side than the output shaft, a third planetary gear mechanism, a third clutch, and a brake, wherein the third planetary gear mechanism includes:
a third sun gear;
a third ring gear connected to the output shaft; and
a third carrier being connected to the final output shaft,
wherein the third clutch selectively connects and disconnects the third sun gear to and from the third ring gear, and
wherein the brake selectively stops rotation of the third sun gear.
11. The gear train unit according to claim 1, further comprising a third planetary gear mechanism, a brake, and a third clutch, wherein the third planetary gear mechanism includes:
a third sun gear;
a third ring gear; and
a third carrier to which drive power is input from the third ring gear,
wherein the third clutch selectively connects and disconnects the third ring gear to and from the third carrier, and
wherein the brake selectively stops rotation of the third sun gear.
12. The gear train unit according to claim 1, further comprising a third planetary gear mechanism, a brake, and a third clutch, wherein the third planetary gear mechanism includes:
a third sun gear;
a third ring gear; and
a third carrier to which drive power is input from the third ring gear,
wherein the third clutch selectively connects and disconnects the third sun gear to and from the third ring gear, and
wherein the brake selectively stops rotation of the third sun gear.
13. The gear train unit according to claim 1, further comprising a final output shaft arranged at a position closer to the to an output side than the output shaft, a third planetary gear mechanism, a third clutch, and a brake, wherein the third planetary gear mechanism includes:
a third sun gear;
a third ring gear connected to the final output shaft; and
a third carrier connected to the output shaft,
wherein the third clutch selectively connects and disconnects the third sun gear to and from the third carrier, and
wherein the brake selectively stops rotation of the third sun gear.
14. The gear train unit according to claim 1, further comprising a final output shaft arranged at a position closer to an output side than the output shaft, a third planetary gear mechanism, a third clutch, and a brake, wherein the third planetary gear mechanism includes:
a third sun gear;
a third carrier connected to the output shaft; and
a third ring gear connected to the final output shaft,
wherein the third clutch selectively connects and disconnects the third sun gear to and from the third ring gear, and
wherein the brake selectively stops rotation of the third sun gear.
15. The gear train unit according to claim 1, further comprising a third planetary gear mechanism, a brake, and a third clutch, wherein the third planetary gear mechanism includes:
a third sun gear;
a third ring gear connected to the input shaft; and
a third carrier to which drive power is input from the third ring gear,
wherein the third clutch selectively connects and disconnects the third sun gear to and from the third carrier, and
wherein the brake selectively stops rotation of the third sun gear.
16. The gear train unit according to claim 1, further comprising a third planetary gear mechanism, a brake, and a third clutch, wherein the third planetary gear mechanism includes:
a third sun gear;
a third ring gear connected to the input shaft; and
a third carrier to which drive power is input from the third ring gear,
wherein the third clutch selectively connects and disconnects the third sun gear to and from the third ring gear, and
wherein the brake selectively stops rotation of the third sun gear.
17. The gear train unit according to claim 1, wherein the gear train unit is arranged in a power transmission path extending between an internal combustion engine and drive wheels of a hybrid vehicle.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A method for adjusting data modulation in a wireless communication system, the method comprising:
receiving data at a transmitter for transmission to a receiver;
formatting the received data into packets for transmission to the receiver, each packet having a particular encodingdata modulation;
transmitting the packets to the receiver;
receiving the packets at the receiver;
for each received packet, generating and transmitting an acknowledgment at the physical layer using a fast feedback channel, if the received packet has an acceptable error rate;
retransmitting that received packet at the transmitter, if an acknowledgment for that packet is not received;
collecting retransmission statistics; and
adjusting each particular encodingdata modulation using the collected retransmission statistics.
2. The method of claim 1 wherein the particular encodingdata modulation is forward error correction (FEC) encodingdata modulation.
3. The method of claim 2 wherein the packets are transmitted using an orthogonal frequency division multiple access (OFDMA) air interface and the particular FEC encodingdata modulation adjusting is performed in addition to selective nulling of subchannels in an OFDMA set.
4. The method of claim 1 wherein the packets are transmitted using a single carrier with frequency domain equalization (SC-FDE) air interface.
5. The method of claim 1 wherein the acknowledgments are transmitted on the fast feedback channel using a code division multiple access (CDMA) air interface.
6. The method of claim 1 further comprising at the receiver for each received packet transmitting a negative acknowledgment, if that packet has an unacceptable error rate.
7. A physical layer automatic request repeat system comprising:
a transmitter having:
a physical layer transmitter for receiving data, formatting the received data into packets, each packet having a particular encodingdata modulation, transmitting the packets, and retransmitting packets in response to not receiving a corresponding acknowledgment for a given packet;
an ACK receiver for receiving the corresponding acknowledgment; and
an adaptive modulation and coding (AMC) controller for collecting retransmission statistics and adjusting the particular data modulations using the collected statistics; and
a receiver having:
a physical layer receiver for demodulating the packets;
a hybrid ARQ combinerdecoder for buffering, decoding and detecting packet errors; and
an acknowledgment transmitter for transmitting an acknowledgment for each packet, if that packet has an acceptable error rate.
8. The system of claim 7 wherein the particular encodingdata modulation is forward error correction (FEC) encodingdata modulation.
9. The system of claim 8 wherein the packets are transmitted using an orthogonal frequency division multiple access (OFDMA) air interface and the particular FEC encodingdata modulation adjusting is performed in addition to selective nulling of subchannels in an OFDMA set.
10. The system of claim 7 wherein the packets are transmitted using a single carrier with frequency domain equalization (SC-FDE) air interface.
11. The method of claim 7 wherein the acknowledgments are transmitted on a fast feedback channel using a code division multiple access (CDMA) air interface.
12. The system of claim 7 further comprising at the receiver transmitting a negative acknowledgment, if any packet has an unacceptable error rate.
13. A physical automatic request repeat system comprising:
a transmitter having:
means for receiving data;
means for formatting the received data into packets for transmission to the receiver, each packet having a particular encodingdata modulation;
means for transmitting the packets to a receiver;
means for retransmitting one of the packets, if an acknowledgment for that packet is not received;
means for collecting retransmission statistics; and
means for adjusting each particular data modulation using the collected retransmission statistics; and
a receiver having:
means for receiving the packets; and
means for each received packet, for decoding and error checking the received packet, and for generating and transmitting an acknowledgment at the physical layer, if that received packet has an acceptable error rate.
14. The system of claim 13 wherein the particular encodingdata modulation is a particular forward error correction (FEC) encodingdata modulation.
15. The system of claim 13 wherein the packets are transmitted using an orthogonal frequency division multiple access (OFDMA) air interface and the particular FEC encodingdata modulation adjusting is performed in addition to selective nulling of subchannels in an OFDMA set.
16. The system of claim 13 wherein the packets are transmitted using a single carrier with frequency domain equalization (SC-FDE) air interface.
17. The method of claim 13 wherein the acknowledgments are transmitted on a fast feedback channel using a code division multiple access (CDMA) air interface.
18. The system of claim 13 further comprising at the receiver for each received packet, transmitting a negative acknowledgment, if that packet has an unacceptable error rate.
19. A communication system employing broadband fixed wireless access comprising:
a sequencer having a queue for receiving data blocks from the network for sequentially conveying packets to n transmitters;
said destination device having n receivers, each associated with one of said n transmitters;
n hybrid ARQ decoders each coupled with one of said n receivers;
said n transmitters subsequently transmitting to their associated n receivers through a data channel;
said n hybrid ARQ decoders having a feedback channel for transmitting acknowledgments to their associated transmitters for controlling retransmission and providing an acknowledge signal to its associated transmitter when an acceptable error rate packet has been received; and
said n hybrid ARQ decoders releasing packets which have an acceptable error rate.
20. The communication system of claim 19 wherein said n signal transmitters each temporarily store a packet that has been transmitted in a buffer memory; and
one of said n transmitters receiving an acknowledge signal from an associated hybrid decoder clearing the stored packet in readiness for receipt of another block.
21. The communication system of claim 19 wherein said n transmitters each temporarily store a packet that has been transmitted in a buffer memory; and
one of said n transmitters failing to receive an acknowledge signal from its associated decoder retransmits the packet temporarily stored in its buffer memory.
22. The system of claim 19 wherein one of said n transmitters clears its buffer memory if an acknowledge signal is not received from its associated decoder after a maximum number of retransmissions.
23. The system of claim 19 wherein the maximum number or retransmissions is an operator defined integer having a range from 1 to 8.
24. The system of claim 19 wherein one of said n receivers requiring a retransmission combines a retransmitted packet with an original transmitted packet to facilitate error correction.
25. The system of claim 19 wherein a transmitter failing to receive an acknowledge signal from an associated decoder encodes the packet employing a different encoding technique from an encoding technique employed in an original transmission of that packet.
26. The system of claim 19 wherein the n transmitters employs Turbo coding and the decoder employs code combining of an original transmission and a retransmission to facilitate error correction.
27. The system of claim 19 wherein one of said n transmitters are incorporated in a base station and said n receivers are incorporated in a subscriber unit.
28. The system of claim 19 wherein said n transmitter are incorporated in a subscriber unit and said n receivers are incorporated in a base station.
29. The system of claim 19 wherein packets are transmitted using an orthogonal frequency division multiple access (OFDMA) air interface in which frequency subchannels in an OFDMA set may be selectively nulled.
30. The system of claim 19 wherein the packets are transmitted using a single carrier with frequency domain equalization (SC-FDE) air interface.
31. The method of claim 19 wherein the acknowledgments are transmitted on a fast feedback channel using a code division multiple access (CDMA) air interface.