Method, communication system and communication unit for synchronisation for multi-rate communication
View Patent ↗A method, communication system and communication unit for synchronisation for multi-rate communication by transmitting a signal (FIG. 4 A) having a synchronisation portion at a first, predetermined chip rate and containing an indication of chip rate used for a further portion; receiving the transmitted signal, recovering the indication from the synchronisation portion at the first, predetermined chip rate, and recovering information in the further portion at the chip rate indicated by the indication. This provides improved efficiency in supporting multi-chip rates.
1. A method for chip rate determination in a multi-chip rate communication system, the method comprising:
receiving a signal having a first signal portion at a first, predetermined chip rate and containing an indication of chip rate selected from a plurality of chip rates used for a further portion;
recovering the indication from the first signal portion at a predetermined bandwidth determined by the first, predetermined chip rate; and
recovering information in the further portion at a bandwidth determined by the chip rate indicated by the indication.
2. The method of claim 1 , wherein recovering the indication comprises filtering the first signal portion using a filter having a bandpass appropriate for the first, predetermined chip rate, and wherein recovering information in the further portion comprises filtering the further portion using a filter having a bandpass appropriate for the indicated chip rate.
3. The method of claim 2 , wherein the filter filtering the first signal portion and the filter filtering the further portion are reconfigurable.
4. The method of claim 1 , wherein the first, predetermined chip rate is lower than the indicated chip rate.
5. The method of claim 1 , wherein the signal comprises a data burst and the first signal portion comprises a synchronisation channel signal.
6. The method of claim 1 , wherein the system is a wireless communication system.
7. The method of claim 6 , wherein the system is a Universal Mobile Telecommunication System (UMTS) system.
8. A method for chip rate determination in a multi-chip rate communication system, the method comprising:
transmitting a signal having a first signal portion at a first, predetermined chip rate and containing an indication of chip rate selected from a plurality of chip rates used for a further portion, wherein the indication is recovered from the first signal portion at a predetermined bandwidth determined by the first, predetermined chip rate, and wherein information in the further portion is recovered at a bandwidth determined by the chip rate indicated by the indication.
9. The method of claim 8 , wherein the first, predetermined chip rate is lower than the indicated chip rate.
10. The method of claim 8 , wherein the signal comprises a data burst and the first signal portion comprises a synchronisation channel signal.
11. The method of claim 8 , wherein the system is a wireless communication system.
12. The method of claim 11 , wherein the system is a Universal Mobile Telecommunication System (UMTS) system.
13. A multi-chip rate communication system comprising:
a transmitter having logic for transmitting a signal having a first signal portion at a first, predetermined chip rate and containing an indication of chip rate selected from a plurality of chip rates used for a further portion;
a receiver having logic for receiving the transmitted signal;
logic for recovering the indication from the first signal portion at a predetermined bandwidth determined by the first, predetermined chip rate; and
logic for recovering information in the further portion at a bandwidth determined by the chip rate indicated by the indication.
14. The system of claim 13 , wherein recovering the indication comprises a filter having a bandpass appropriate for the first, predetermined chip rate, and wherein recovering information in the further portion comprises a filter having a bandpass appropriate for the indicated chip rate.
15. The system of claim 14 , wherein the filter having a bandpass appropriate for the first, predetermined chip rate and the filter having a bandpass appropriate for the indicated chip rate are reconfigurable.
16. The system of claim 13 , wherein the first, predetermined chip rate is lower than the indicated chip rate.
17. The system of claim 13 , wherein the signal comprises a data burst and the first signal portion comprises a synchronisation channel signal.
18. The system of any claim 13 , wherein the system is a wireless communication system.
19. The system of claim 18 , wherein the system is a Universal Mobile Telecommunication System (UMTS) system.
20. A communication unit for use in a multi-chip rate communication system, the communication unit comprising:
logic for receiving a signal having a first signal portion at a first, predetermined chip rate and containing an indication of chip rate selected from a plurality of chip rates used for a further portion;
logic for recovering the indication from the first signal portion at a predetermined bandwidth determined by the first, predetermined chip rate; and
logic for recovering information in the further portion at a bandwidth determined by the chip rate indicated by the indication.
21. The communication unit of claim 20 , wherein recovering the indication comprises a filter having a bandpass appropriate for the first, predetermined chip rate, and wherein recovering information in the further portion comprises a filter having a bandpass appropriate for the indicated chip rate.
22. The communication unit of claim 21 , wherein the filter having a bandpass appropriate for the first, predetermined chip rate and the filter having at a bandpass appropriate for the indicated chip rate are reconfigurable.
23. The communication unit of claim 20 , wherein the first, predetermined chip rate is lower than the indicated chip rate.
24. The communication unit of claim 20 , wherein the signal comprises a data burst and the first signal portion comprises a synchronisation channel signal.
25. The communication unit of claim 20 , wherein the system is a wireless communication system.
26. The communication unit of claim 25 , wherein the system is a Universal Mobile Telecommunication System (UMTS) system.
27. A communication unit for use in a multi-rate communication system, the communication unit comprising:
logic for transmitting a signal having a first signal portion at a first, predetermined chip rate and containing an indication of chip rate selected from a plurality of chip rates used for a further portion, wherein the indication is recovered from the first signal portion at a predetermined bandwidth determined by the first, predetermined chip rate, and wherein information in the further portion is recovered at a bandwidth determined by the chip rate indicated by the indication.
28. The communication unit of claim 27 , wherein the first, predetermined chip rate is lower than the indicated chip rate.
29. The communication unit of claim 27 , wherein the signal comprises a data burst and the first signal portion comprises a synchronisation channel signal.
30. The communication unit of claim 27 , wherein the system is a wireless communication system.
31. The communication unit of claim 30 , wherein the system is a Universal Mobile Telecommunication System (UMTS) system.
32. he communication unit of claim 20 , wherein the communication unit is user equipment.
33. A computer program product comprising instructions for performing the method of chip-rate determination in a multi-chip rate communication system encoding functions as in the method of claim 1 .
34. The communication unit of claim 20 , wherein the communication unit is a node B.