Signal arrangement for multi-bandwidth OFDM system

• US 20070116094A1
• Filed: 10/24/2006
• Published: 05/24/2007
• Est. Priority Date: 11/01/2005
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Jansen, Kaj, Parts, Ulo
• Granted Patent: US 7,894,417 B2
• Time in Patent Office: Days
• US Class Current: 375/130
• CPC Class Codes: H04J 11/0086 Search parameters, e.g. search strategy, accumulation length, range of search, thresholds code acquisition in DSSS H04B1/7075
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2656 Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 27/2662 Symbol synchronisation
• CPC Class Codes: H04L 27/2675 Pilot or known symbols
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority

Abstract

A pilot structure, a method, and a receiver for multi-carrier cellular communications communication system include a network element and a user equipment. The network element is configured to transmit a pilot sequence. The user equipment is configured to detect a pilot sequence comprising a primary synchronization sequence at predetermine number of sub-frames at a center of a bandwidth, a primary common pilot for each sub-frame, and short system information once per frame at the center of the bandwidth, and to decode the short system information to identify system frame timing and a system bandwidth of a cell.

Claims

1. A method, comprising:

configuring a primary synchronization sequence every predetermine number of sub-frames of a frame at a center of a bandwidth;

configuring a primary common pilot to be transmitted for each sub-frame, wherein the primary synchronization sequence is configured at a different symbol of a sub-frame of the frame than the primary common pilot;

configuring short system information to be transmitted once per frame at the center of the bandwidth; and

transmitting the frame comprising the primary synchronization sequence, the primary common pilot, and the short system information to identify system frame timing.

2. The method as recited in claim 1, wherein the structure of the frame period comprises definitions of at least one of sub-frames, signaling channels, and pilot positions.

3. The method as recited in claim 1, further comprising:

defining the predetermined number of sub-frames in the defined bandwidth as every fourth or fifth sub-frame.

4. The method as recited in claim 1, further comprising:

defining the primary common pilot to be present in a first symbol of every sub-frame.

5. The method as recited in claim 1, further comprising:

configuring the short system information to be transmitted using a predetermined number of symbols of a sub-frame.

6. A method, comprising:

detecting a pilot sequence comprising a primary synchronization sequence at predetermine number of sub-frames at a center of a bandwidth, a primary common pilot for each sub-frame, and short system information once per frame at the center of the bandwidth, wherein the primary synchronization sequence is configured at a different symbol of a sub-frame than the primary common pilot; and

decoding the short system information to identify system frame timing and a system bandwidth of a cell.

7. The method as recited in claim 6, further comprising:

adjusting a receiver bandwidth according to the decoded bandwidth of the cell.

8. The method as recited in claim 6, further comprising:

decoding the short system information and reading a frame number to further identify system frame timing.

9. The method as recited in claim 6, further comprising:

based on the identified access point, performing symbol, sub-frame, and frame synchronization and correcting frequency offset.

10. A computer program embodied on a computer readable medium, the computer program being configured to perform:

configuring a primary synchronization sequence every predetermine number of sub-frames of a frame at a center of a bandwidth;

configuring a primary common pilot to be transmitted for each sub-frame, wherein the primary synchronization sequence is configured at a different symbol of a sub-frame of the frame than the primary common pilot;

configuring short system information to be transmitted once per frame at the center of the bandwidth; and

transmitting the frame comprising the primary synchronization sequence, the primary common pilot, and the short system information to identify system frame timing.

11. A computer program embodied on a computer readable medium, the computer program being configured to perform:

detecting a pilot sequence comprising a primary synchronization sequence at predetermine number of sub-frames at a center of a bandwidth, a primary common pilot for each sub-frame, and short system information once per frame at the center of the bandwidth, wherein the primary synchronization sequence is configured at a different symbol of a sub-frame than the primary common pilot; and

decoding the short system information to identify system frame timing and a system bandwidth of a cell.

12. A communication system, comprising:

a network element configured to transmit a pilot sequence; and

a user equipment configured to detect a pilot sequence comprising a primary synchronization sequence at predetermine number of sub-frames at a center of a bandwidth, a primary common pilot for each sub-frame, and short system information once per frame at the center of the bandwidth, and to decode the short system information to identify system frame timing and a system bandwidth of a cell.

13. The communication system as recited in claim 12, wherein the primary synchronization sequence is configured at a different symbol of a sub-frame than the primary common pilot.

14. A communication system, comprising:

network element means for transmitting a pilot sequence; and

user equipment means for detecting a pilot sequence comprising a primary synchronization sequence at predetermine number of sub-frames at a center of a bandwidth, a primary common pilot for each sub-frame, and short system information once per frame at the center of the bandwidth, and to decode the short system information to identify system frame timing and a system bandwidth of a cell.

15. A user equipment, comprising:

a receiver configured to detect a pilot sequence comprising a primary synchronization sequence at predetermine number of sub-frames at a center of a bandwidth, a primary common pilot for each sub-frame, and short system information once per frame at the center of the bandwidth, and to decode the short system information to identify system frame timing and a system bandwidth of a cell.

16. The user equipment as recited in claim 15, wherein the receiver adjusts a receiver bandwidth according to the decoded bandwidth of the cell.

17. The user equipment as recited in claim 15, wherein the receiver decodes the short system information and reads a frame number to further identify system frame timing.

18. The user equipment as recited in claim 15, wherein, based on the identified access point, the receiver performs symbol, sub-frame, and frame synchronization and correcting frequency offset.

19. A network element, comprising:

a transmitter configured to transmit a primary synchronization sequence every predetermine number of sub-frames at a center of a bandwidth, to transmit a primary common pilot for each sub-frame, and to transmit short system information once per frame at the center of the bandwidth to identify system frame timing, wherein the primary synchronization sequence is configured at a different symbol of a sub-frame than the primary common pilot.

20. The network element as recited in claim 19, wherein the structure of the frame period comprises definitions of at least one of sub-frames, signaling channels, and pilot positions.

21. The network element as recited in claim 19, wherein the predetermined number of sub-frames is defined in the defined bandwidth as every fourth or fifth sub-frame.

22. The network element as recited in claim 19, wherein the primary common pilot is configured to be present in a first symbol of every sub-frame.

23. The network element as recited in claim 19, wherein the transmitter transmits the short system information once per frame to define frame timing.

24. The network element as recited in claim 19, wherein the transmitter transmits the short system information using a predetermined number of symbols of a sub-frame.