MIMO OFDMA AND PREAMBLE DESIGN

• US 20100309868A1
• Filed: 06/03/2010
• Published: 12/09/2010
• Est. Priority Date: 06/03/2009
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Via Telecom Inc. (VIA Technologies)
• Inventors: Yang, Hong-Kui, Wang, Shu
• Granted Patent: US 8,964,720 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04W 72/121 for groups of terminals or users

Abstract

A method is provided for coupling a plurality of access nodes wirelessly to a plurality of access terminals. The method includes dividing up a carrier frequency into a plurality of subbands; scheduling one or more access terminals to share one of the plurality of subbands; and via one of the plurality of access nodes, first communicating with the one or more access terminals over the one of the plurality of subbands. The communicating includes, within the one of the plurality of subbands, time division multiplexing interlaces corresponding to each of the one or more access terminals.

Claims

1. A method for coupling a plurality of access nodes wirelessly to a plurality of access terminals, the method comprising:

scheduling the plurality of access terminals to share one of a plurality of subbands through the plurality of access nodes; and

communicating with the plurality of access terminals according to one of the plurality of subbands, the plurality of subbands comprising a plurality of preambles, said communicating further comprising time division multiplexing interlaces corresponding to each of the plurality of access terminals according to the plurality of subbands and the plurality of preambles.

2. The method as recited in claim 1, wherein said communicating comprises transmitting a system public data field signal indicating which one of the plurality of subbands are configured to a particular access terminal when of the particular access terminals set up connection with one of the plurality of access nodes, said scheduling the plurality of access terminals to share one of the plurality of subbands comprising transmitting at least one of the following:

OFDM data;

MIMO data;

Single-layer OFDM multi-user packet data; and

Multi-layer OFDM multi-user packet data;

wherein said transmitting is based on a plurality of slots or the plurality of subbands, the plurality of slots is divided by one of the plurality of subbands based on timeline.

3. The method as recited in claim 1, wherein said scheduling the plurality of access terminals to share one of the plurality of subbands comprising:

transmitting OFDM data according to the plurality of access terminals, wherein at least one of the plurality of subbands transmitting a multiuser packet with superposition coding; and

transmitting MIMO data with an antenna which is corresponding with the plurality of terminals, the antenna is determined according to at least one of the following;

beam selection, wherein a beam with strong signal power with a feedback of a preamble message indicator; and

subband selection, wherein the AT calculated the preamble message indicator for a desired subband and report back the preamble message indicator to the access node.

4. The method as recited in claim 1, wherein the plurality of access terminals which sharing one of the plurality of subbands are assigned to at least one of a plurality of OFDM cells, each cell provides a plurality of data rate control signals corresponding to the plurality of subbands.

5. The method as recited in claim 1, wherein the plurality of preambles comprising at least one of the following:

an interlace indication;

a MAC-ID;

a rate indicator;

a subband pattern;

a multiplexing pattern; and

a first subband which carries preamble or packet of all OFDM multiuser packet data.

6. The method as recited in claim 1, further comprising employing a two-level indicator denoting whether a following packet is a single-user packet or a multiuser packet, wherein a first signal of the two-level indicators is CDM modulated, OFDM modulated, or modulated on an existing pilots, and a second signal of the two-level indicators denotes which one of the plurality of access terminals is to be served in a following interlace.

7. The method as recited in claim 1, wherein the plurality of subbands further comprising a two-level pilot when said scheduling the plurality of access terminals to share one of the plurality of subbands comprising transmitting both of MIMO and OFDM data, the two-level pilot further comprising:

a common spatial pilot indicating the following transmission or interlace is multiuser or single user; and

a dedicated spatial pilot indicating which access terminal to be served.

8. An apparatus wirelessly coupled to a plurality of access terminals, the apparatus comprising:

a controller configured to schedule the plurality of access terminals to share one of a plurality of subbands through the plurality of access nodes; and

a communicating module coupled to the plurality of access terminals and the controller, the plurality of subbands comprising a plurality of preambles, the communicating module configured to conduct time division multiplexing interlaces corresponding to each of the plurality of access terminals according to the plurality of subbands and the plurality of preambles.

9. The apparatus as recited in claim 8, wherein said communicating module further comprises transmitting a system public data field indicating which one of the plurality of subbands are configured to a particular access terminal when of the particular access terminals set up connection with one of the plurality of access nodes, said controller comprising transmitting at least one of the following:

OFDM data;

MIMO data;

single-layer OFDM multi-user packet data; and

multi-layer OFDM multi-user packet data,

wherein said transmitting is based on a plurality of slots or the plurality of subbands, the plurality of slots is divided by one of the plurality of subbands based on timeline.

10. The apparatus as recited in claim 8, wherein said controller comprising:

transmitting OFDM data according to the plurality of access terminals, wherein at least one of the plurality of subbands transmitting a multiuser packet with superposition coding; and

transmitting MIMO data with a receiving antenna which is corresponding with the plurality of terminals, the receiving antenna is determined according to at least one of the following;

beam selection, wherein a beam with strong signal power with a feedback of a preamble message indicator; and

subband selection, wherein the plurality of access terminals calculated the preamble message indicator for a desired subband and report back the preamble message indicator to the access node.

11. The apparatus as recited in claim 8, wherein the plurality of access terminals which sharing one of the plurality of subbands are assigned to at least one of a plurality of OFDM cells, each cell provides a plurality of data rate control signals corresponding to the plurality of subbands.

12. The apparatus as recited in claim 8, wherein the plurality of preambles comprising at least one of the following:

an interlace indication;

a MAC-ID;

a rate indicator;

a subband pattern;

a multiplexing pattern; and

a first subband which carries preamble or packet of all OFDM multiuser packet data.

13. The apparatus as recited in claim 8, further comprising employing a two-level indicator denoting whether a following packet is a single-user packet or a multiuser packet, wherein a first signal of the two-level indicators is CDM modulated, OFDM modulated, or modulated on existing pilots, and a second signal of the two-level indicators denotes which one of the plurality of access terminals is to be served in a following interlace.

14. The apparatus as recited in claim 8, wherein the plurality of subbands further comprising a two-level pilot when said controller comprising transmitting both of MIMO and OFDM data, the two-level pilot further comprising:

a common spatial pilot indicating the following transmission or interlace is multiuser or single user; and

a dedicated spatial pilot indicating which access terminal to be served.

15. A method for an access terminal which is coupled to a plurality of access nodes, the method comprising:

receiving one of a plurality of subbands which is decided by the plurality of access nodes; and

communicating with the plurality of access nodes according to one of the plurality of subbands, the plurality of subbands comprising a plurality of preambles, said communicating further comprising time division multiplexing interlaces according to the plurality of subbands and the plurality of preambles.

16. The method as recited in claim 15, wherein said communicating further comprises receiving a system public data field indicating which one of the plurality of subbands are configured to the access terminal when the access terminals set up connection with one of the plurality of access nodes, the method further comprising receiving at least one of the following:

OFDM data;

MIMO data;

single-layer OFDM multi-user packet data; and

multi-layer OFDM multi-user packet data,

wherein said receiving is based on a plurality of slots or the plurality of subbands, the plurality of slots is divided by one of the plurality of subbands based on timeline.

17. The method as recited in claim 15, wherein when the access terminal sharing one of the plurality of subband with other access terminals, the method comprising:

receiving OFDM data, the corresponding subband transmitting a multiuser packet with superposition coding; and

receiving MIMO data with an antenna, the antenna is determined according to at least one of the following;

beam selection, wherein a beam with strong signal power with a feedback of a preamble message indicator; and

subband selection, wherein the access terminal calculated the preamble message indicator for a desired subband and report back the preamble message indicator to the access node.

18. The method as recited in claim 15, wherein when the access terminal sharing one of the plurality of subband with other access terminals and assigned to at least one of a plurality of ODFM cells, the method further comprising receiving a plurality of data rate control singles corresponding to the plurality of subbands.

19. The method as recited in claim 15, wherein the plurality of preambles comprising at least one of the following:

an interlace indication;

a MAC-ID;

a rate indicator;

a subband pattern;

a multiplexing pattern; and

a first subband which carries preamble or packet of all OFDM multiuser packet data.

20. The method as recited in claim 15, further comprising receiving a two-level indicator denoting whether a following packet is served for the access terminal or not, wherein a first signal of the two-level indicators is CDM modulated, OFDM modulated, or modulated on existing pilots, and a second signal of the two-level indicators denotes whether access terminals is to be served in a following interlace.

21. The method as recited in claim 15, wherein one of the plurality of subbands further comprising a two-level pilot when the access terminal sharing one of the plurality of subbands with other access terminals and receiving both of MIMO and OFDM data, the two-level pilot further comprising:

a common spatial pilot indicating the following transmission or interlace is multiuser or single user; and

a dedicated spatial pilot indicating which access terminal to be served.

22. An apparatus which is coupled to a plurality of access nodes, the apparatus comprising:

a receiver, configured to receive one of a plurality of subbands which is decided by a plurality of access nodes; and

a communicating module coupled to the plurality of access nodes according to one of the plurality of subbands, the plurality of subbands comprising a plurality of preambles, said communicating module further comprising time division multiplexing interlaces according to the plurality of subbands and the plurality of preambles.

23. The apparatus as recited in claim 22, wherein said communicating module further comprises receiving a system public data field indicating which one of the plurality of subbands are configured to the apparatus when the apparatus setted up connection with one of the plurality of access nodes, the receiver further comprising receiving at least one of the following:

OFDM data;

MIMO data;

single-layer OFDM multi-user packet data; and

multi-layer OFDM multi-user packet data,

wherein said receiving is based on a plurality of slots or the plurality of subbands, the plurality of slots is divided by one of the plurality of subbands based on timeline.

24. The apparatus as recited in claim 22, wherein when the apparatus sharing one of the plurality of subband with another apparatus, the apparatus comprising:

receiving OFDM data, the corresponding subband transmitting a multiuser packet with superposition coding; and

receiving MIMO data with an antenna, the antenna is determined according to at least one of the following;

beam selection, wherein a beam with strong signal power with a feedback of a preamble message indicator; and

subband selection, wherein the apparatus calculated the preamble message indicator for a desired subband and report back the preamble message indicator to the access node.

25. The apparatus as recited in claim 22, wherein when the apparatus sharing one of the plurality of subband with another apparatus and assigned to at least one of a plurality of ODFM cells, the apparatus further comprising receiving a plurality of data rate control singles corresponding to the plurality of subbands.

26. The apparatus as recited in claim 22, wherein the plurality of preambles comprising at least one of the following:

an interlace indication;

a MAC-ID;

a rate indicator;

a subband pattern;

a multiplexing pattern; and

a first subband which carries preamble or packet of all OFDM multiuser packet data.

27. The apparatus as recited in claim 22, the receiver further comprising receiving a two-level indicator denoting whether a following packet is served for the apparatus or not, wherein a first signal of the two-level indicators is CDM modulated, OFDM modulated, or modulated on existing pilots, and a second signal of the two-level indicators denotes whether apparatus is to be served in a following interlace.

28. The apparatus as recited in claim 22, wherein the plurality of subbands further comprising a two-level pilot when the apparatus sharing one of the plurality of subbands with another apparatus and receiving both of MIMO and OFDM data, the two-level pilot further comprising:

a common spatial pilot indicating the following transmission or interlace is multiuser or single user; and

a dedicated spatial pilot indicating which apparatus to be served.