Multiple traffic types in a multicarrier system

• US 20080025255A1
• Filed: 07/25/2006
• Published: 01/31/2008
• Est. Priority Date: 07/25/2006
• Status: Abandoned Application

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Garg, Deepshikha, Canchi, Radhakrishna
• Application Number:
  US11/492,566
• Publication Number:
  US 20080025255A1
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601

Abstract

Disclosed is a wireless communications system having multiple communication channel types in a multi-carrier system. The different channel types, which correspond to different data rates, are allocated depending on the type of session being initialized (its data rate requirements). This is accomplished using different orthogonal code lengths with different carriers and their subcarriers. An orthogonal code length is assigned to a carrier and used with its subcarriers to create a set of assignable channels having differing data rates. The association between a carrier and an orthogonal code length can be dynamically reassigned depending on the needs of active sessions.

Claims

1. A node configured to be operable in a wireless network comprising:

a transmitter configured to transmit multicarrier code division multiplexed OFDM data transmissions, further configured to encode a data signal containing symbols for transmission using an orthogonal code of length L, and configured such that if L=1 then the data signal is not logically changed, and further configured to transmit the data signal using a carrier'"'"'s orthogonal subcarriers where the total number of subcarriers is M, L<

=M, and the number of subcarriers used per symbol is dependent on L;

a receiver configured to receive multicarrier code division multiplexed OFDM data transmissions, further configured to process the carrier'"'"'s orthogonal subcarriers in a manner based on L, and configured to decode a received data signal using the orthogonal code of length L where, if L=1, the data signal is not logically changed.

2. The node of claim 1 further configured to allow transmission and reception using a selected carrier from a set of N carriers, each of the N carriers having M orthogonal subcarriers.

3. The node of claim 2 where the N carriers are further configured such that at least one carrier is configured with L=1 and all the carriers'"'"' subcarriers are assignable to a single session.

4. The node of claim 2 where each of the N carriers is associated with an orthogonal code length which is less than or equal to M, and where each of the N carriers has a number of assignable communications channels equal to its associated orthogonal code length, and where each associated orthogonal code length becomes the value of L for the transmitter and the receiver when the channel is active.

5. The node of claim 4 where each of the N carriers is further configured to allow its associated orthogonal code length to be changed.

6. The node of claim 4 where associated orthogonal code lengths comprise at least two different lengths.

7. The node of claim 6 where one of the at least two different lengths is of length 1, the assignable channel associated with length 1 being an OFDM channel, with a same number of orthogonal subcarriers.

8. A method of using channels in a node, the node configurable for use in a wireless network, the method comprising:

using an orthogonal code length L on a symbol to be transmitted;

selecting a carrier usable to transmit the symbol, the carrier having M orthogonal subcarriers, where L is less than or equal to M, and where the number of subcarriers selected to transmit the symbol is equal to L.

9. The method of claim 8 further comprising:

initializing a session using the orthogonal code of length L and the selected carrier;

transmitting the symbol using the L subcarriers.

10. The method of claim 9 further comprising:

receiving a transmission;

using the orthogonal code of length L on the signal received over the L subcarriers.

11. The method of claim 9 further comprising:

detecting a need for a different data rate;

initializing a second session based on the different data rate using a different orthogonal code length L1 and a different carrier, L1 being less than or equal to the number of subcarriers in the different carrier.

12. A method of using multiple channel types in a wireless system, the method comprising:

detecting a session initialization request;

determining a type of channel to associate with the request;

using the determined channel type to select an orthogonal code of length L;

selecting a carrier based on L where the carrier has a number of orthogonal subcarriers equal to or greater than L;

enabling a session to be initialized using a communications channel comprising using the determined L and the associated carrier.

13. The method of claim 12 where the type of channel is characterized by one of:

voice, http, ftp, streaming video, or, streaming audio.

14. The method of claim 12 further comprising:

using a default data rate to make a selection of an orthogonal code of length L when a type of channel cannot be determined.

15. The method of claim 12 further comprising:

transmitting a symbol that has been spread using the orthogonal code.

16. The method of claim 15 further comprising:

transmitting the symbol further using L of the orthogonal subcarriers.

17. The method of claim 16 further comprising:

receiving the symbol;

reassembling the spread symbol from the L orthogonal subcarriers;

using the orthogonal code to recover the symbol.

18. The method of claim 14 further comprising:

detecting that the enabled communications channel has a data rate not optimized for the session;

selecting a different L and an associated carrier based on a more optimized data rate;

continuing the session using a different communications channel based on the different L and an associated carrier.

19. The method of claim 12 where the multiple channel types further comprise a set of N carriers each having M orthogonal subcarriers, where the set of selectable orthogonal code lengths all have lengths less than or equal to M, and where each of the N carriers presently has an associated orthogonal code length.

20. The method of claim 19 further comprising:

detecting at least one carrier that is not optimized for the data rates of sessions being one of generated or requested;

quiescing the non-optimized carrier, if it is not already quiesced;

associating a different orthogonal code length with the quiesced carrier, the different length based on sessions being one of generated or requested, resulting in a reconfigured carrier;

enabling a session using the reconfigured carrier.