Code channel management in a wireless communications system

• US 7,933,250 B2
• Filed: 06/23/2003
• Issued: 04/26/2011
• Est. Priority Date: 06/23/2003
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tsybakov, Boris, Gaal, Peter, Tiedemann, Edward Jr.
• Primary Examiner(s): Sheikh; Ayaz R
• Assistant Examiner(s): LEE, ANDREW CHUNG CHEUNG
• Application Number:
  US10/602,359
• Publication Number:
  US 20040258027A1
• Time in Patent Office: 2,864 Days
• Field of Search: 370/441, 370/443, 370/444, 370/465, 370/335, 370/342, 370/328, 370/252, 455/450, 455/453, 455/522, 455/517, 455/422.1
• US Class Current: 370/335
• CPC Class Codes: H04J 13/004 Orthogonal
• CPC Class Codes: H04J 13/0048 Walsh
• CPC Class Codes: H04J 13/0074 Code shifting or hopping
• CPC Class Codes: H04J 13/18 Allocation of orthogonal codes
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning

Abstract

Systems and techniques are disclosed relating to communications. The systems and techniques involve dividing a plurality of subscriber stations into a plurality of groups, assigning a different plurality of orthogonal codes to each of the groups, the number of the orthogonal codes assigned to one of the groups being less than the number of subscriber stations in said one of the groups, encoding communications to one of the subscriber stations in said one of the groups at a data rate, and determining whether to spread at least a portion of communications to said to one of the subscriber stations with one of the orthogonal codes assigned to said one of the groups as a function of the data rate.

Claims

1. A method of communications, comprising:

dividing a plurality of subscriber stations into a plurality of groups;

assigning a lesser number of a plurality of orthogonal codes for supplemental traffic channels to one of the groups than a number of traffic channels to be assigned to the subscriber stations in the one of the groups;

encoding communications to one of the subscriber stations in the one of the groups at a data rate at least a portion greater than a first data rate supported by a dedicated traffic channel of the one of the subscriber stations; and

determining whether to spread at least the portion of communications to the one of the subscriber stations with one of the orthogonal codes supporting a second data rate adequate to handle the portion.

2. The method of claim 1 further comprising allocating to the one of the subscriber stations one or more of the orthogonal codes assigned to the one of the groups, the one of the orthogonal codes being selected from the one or more of the orthogonal codes allocated to the one of the subscriber stations.

3. The method of claim 1 further comprising allocating to each of the subscriber stations in the one of the groups one or more of the orthogonal codes assigned to the one of the groups, and using each of the orthogonal codes in the one of the groups to spread at least a portion of communications to different subscriber stations in the one of the groups, the orthogonal code being used to spread the at least a portion of the communications to each of the different subscriber stations being selected from the respective one or more of the codes allocated thereto.

4. The method of claim 1 further comprising spreading a second portion of the communications to the one of the subscriber stations with a second orthogonal code different from each of the orthogonal codes assigned to the groups.

5. The method of claim 1 wherein the data rate of the communications comprises a full rate and less than a full rate, and wherein the at least a portion of the communications to the one of the subscriber stations is spread with the one of the orthogonal codes when the data rate of the communications is the full rate, and wherein the at least a portion of the communications to the one of the subscriber stations is not spread with the one of the orthogonal codes when the data rate of the communications is less than the full rate.

6. A communications station, comprising:

a processor configured to divide a plurality of subscriber stations into a plurality of groups, and assign a lesser number of a plurality of orthogonal codes for supplemental traffic channels to one of the groups than a number of traffic channels to be assigned to the subscriber stations in the one of the groups; and

an encoder configured to encode communications to one of the subscriber stations in the one of the groups at a data rate at least a portion greater than a first data rate supported by a dedicated traffic channel of the one of the subscriber stations;

wherein the processor is further configured to determine whether to spread at least the portion of communications to the to one of the subscriber stations with one of the orthogonal codes supporting a second data rate adequate to handle the portion.

7. The communications station of claim 6 wherein the orthogonal codes assigned to the one of the groups each have the same length.

8. The communications station of claim 6 wherein the processor is further configured to allocate to the one of the subscriber stations one or more of the orthogonal codes assigned to the one of the groups, the one of the orthogonal codes being selected from the one or more of the orthogonal codes allocated to the one of the subscriber stations.

9. The communications station of claim 6 wherein the encoder is further configured to encode communications to the subscriber stations in the one of the groups, and wherein the processor is further configured to allocate one or more of the orthogonal codes assigned to the one of the groups to each of the subscriber stations in the one of the groups, and use each of the orthogonal codes in the one of the groups to spread at least a portion of the communications of different ones of the subscriber stations in the one of the groups, the orthogonal code being used to spread the at least a portion of the communications to each of the different ones of the subscriber stations being selected from the respective one or more of the codes allocated thereto.

10. The communications station of claim 9 wherein a different combination of the orthogonal codes are allocated to each of the subscriber stations in the one of the groups.

11. The communications station of claim 9 wherein a same combination of the orthogonal codes are allocated to a plurality of the subscriber stations in the one of the groups.

12. The communications station of claim 6 further comprising a modulator configured to spread a second portion of the communications to the one of the subscriber stations with a second orthogonal code different from each of the orthogonal codes assigned to the groups.

13. The communications station of claim 6 wherein the data rate of the communications comprises a full rate and less than a full rate, the communications station further comprising a modulator configured to spread the at least a portion of the communications to the one of the subscriber stations when the data rate of the communications is the full rate, and not spread the at least a portion of the communications to the one of the subscriber stations when the data rate of the communications is less than the full rate.

14. The communications station of claim 13 wherein the less than full rate comprises a data rate equal to ½

the full rate.

15. The communications station of claim 14 wherein the less than full rate comprises a data rate equal to ¼

the full rate and a data rate equal to ⅛

the full rate.

16. The communications station of claim 15 wherein the encoder comprises a vocoder.

17. A communications station, comprising:

means for assigning a lesser number of a plurality of orthogonal codes for supplemental traffic channels to one of the groups than a number of traffic channels to be assigned to the subscriber stations in the one of the groups;

means for encoding communications to one of the subscriber stations in the one of the groups at a data rate at least a portion greater than a first data rate supported by a dedicated traffic channel of the one of the subscriber stations; and

means for determining whether to spread at least the portion of communications to the one of the subscriber stations with one of the orthogonal codes supporting a second data rate adequate to handle the portion.

18. A non-transitory computer-readable medium including computer-executable instructions encoded thereon for performing the steps of:

dividing a plurality of subscriber stations into a plurality of groups;

assigning a lesser number of a plurality of orthogonal codes for supplemental traffic channels to one of the groups than a number of traffic channels to be assigned to the number of subscriber stations in the one of the groups;

encoding communications to one of the subscriber stations in the one of the groups at a data rate at least a portion greater than a first data rate supported by a dedicated traffic channel of the one of the subscriber stations; and

determining whether to spread at least the portion of communications to the one of the subscriber stations with one of the orthogonal codes supporting a second data rate adequate to handle the portion.

19. The non-transitory computer-readable medium of claim 18 further comprising computer-executable instructions encoded thereon for performing the step of allocating to the one of the subscriber stations one or more of the orthogonal codes assigned to said the one of the groups, the one of the orthogonal codes being selected from the one or more of the orthogonal codes allocated to the one of the subscriber stations.

20. The non-transitory computer-readable medium of claim 18 further comprising computer-executable instructions encoded thereon for performing the step of:

allocating to each of the subscriber stations in the one of the groups one or more of the orthogonal codes assigned to the one of the groups, and using each of the orthogonal codes in the one of the groups to spread at least a portion of communications to different subscriber stations in the one of the groups, the orthogonal code being used to spread the at least a portion of the communications to each of the different subscriber stations being selected from the respective one or more of the codes allocated thereto.

21. The non-transitory computer-readable medium of claim 18 further comprising computer-executable instructions encoded thereon for performing the step of spreading a second portion of the communications to the one of the subscriber stations with a second orthogonal code different from each of the orthogonal codes assigned to the groups.

22. The non-transitory computer-readable medium of claim 21 wherein the data rate of the communications comprises a full rate and less than a full rate, and wherein said the at least a portion of the communications to the one of the subscriber stations is spread with the one of the orthogonal codes when the data rate of the communications is the full rate, and wherein the at least a portion of the communications to the one of the subscriber stations is not spread with the one of the orthogonal codes when the-data rate of the communications is less than the full rate.

23. A method of communications, comprising:

receiving a dedicated orthogonal code for a dedicated traffic channel wherein a length of the dedicated orthogonal code supports a first data rate less than a full data rate of a subscriber station; and

receiving an assignment of a plurality of orthogonal codes for supplemental traffic channels wherein a length of at least one of the plurality of orthogonal codes supports a second data rate adequate to handle an overflow up to the full data rate of the subscriber station.

24. The method of claim 23 wherein the first data rate is a half data rate and the second data rate is one of an eighth data rate, quarter data rate, and half data rate.

25. The method of claim 23 wherein one of the plurality of orthogonal codes for supplemental channels can be substituted for another one of the plurality of orthogonal codes on a frame-by-frame basis.