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Methods and apparatuses are presented for conducting communications over a shared communication medium involving a plurality of nodes, involving (a) sending a request from a first node, the shared communication medium organized to include a request signal space and a scheduled transmission signal sp

Methods and apparatuses are presented for conducting communications over a shared communication medium involving a plurality of nodes, involving (a) sending a request from a first node, the shared communication medium organized to include a request signal space and a scheduled transmission signal space, the request signal space including request segments each having a different location within the request signal space, the scheduled transmission signal space including scheduled transmission segments each having a different location within the scheduled transmission signal space, the request sent in a request segment, (b) obtaining an assignment associating the request with a scheduled transmission segment, taking into account location of the request within the request signal space, (c) from the first node, sending a data transmission in the scheduled transmission segment associated with the request, and (d) wherein the plurality of scheduled transmission segments include multiple categories of scheduled transmission segments associated with different service types.

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What is claimed is: 1. A method for conducting communications over a shared communication medium involving a plurality of nodes, the method comprising: (a) sending a request to a scheduler from a first node in the plurality of nodes, the shared communication medium organized to include a request si

What is claimed is: 1. A method for conducting communications over a shared communication medium involving a plurality of nodes, the method comprising: (a) sending a request to a scheduler from a first node in the plurality of nodes, the shared communication medium organized to include a request signal space having at least one frame and a scheduled transmission signal space, the request signal space including a plurality of request segments each having a different location defined within the at least one frame within the request signal space, the scheduled transmission signal space including a plurality of scheduled transmission segments each having a different location within the scheduled transmission signal space, the request sent in a request segment that is one of the plurality of request segments; (b) at the first node, obtaining an assignment from the scheduler associating the request with a scheduled transmission segment selected from the plurality of scheduled transmission segments, the assignment taking into account location of the request within the request signal space; (c) from the first node, sending a data transmission in the scheduled transmission segment associated with the request in accordance with the assignment; and (d) wherein the plurality of scheduled transmission segments include multiple categories of scheduled transmission segments associated with different service types, and wherein the request is for transmission in a particular category of scheduled transmission segments associated with a particular service type. 2. The method of claim 1 wherein the plurality of request segments include multiple categories of requests segments, and wherein each category of request segments is used for requesting transmission in a particular category of scheduled transmission segments associated with a particular service type. 3. The method of claim 2 wherein the request comprises 1 symbol in the request signal space. 4. The method of claim 1 wherein the request comprises N symbols sent in the request signal space, N being a positive integer greater than zero. 5. The method of claim 4 wherein the N symbols of the request are non-coherently detected. 6. The method of claim 5 wherein the N symbols of the request specifies one out of 2N−1 service types. 7. The method of claim 4 wherein the N symbols of the request are coherently detected. 8. The method of claim 7 wherein the N symbols of the request are modulated according to a modulation scheme. 9. The method of claim 8 wherein the modulation scheme is an M-ary differential phase shift keying (M-DPSK) modulation scheme. 10. The method of claim 9 wherein the N symbols of the request specifies one out of MN−1 service types where M is greater than zero. 11. The method of claim 7 wherein the N symbols of the request are coded according to a coding scheme. 12. The method of claim 11 wherein the coding scheme is a block coding scheme. 13. A method for conducting communications over a shared communication medium involving a plurality of nodes including a first node and a second node, the method comprising: (a) at the second node, receiving a request from the first node, the shared communication medium organized to include a request signal space having at least one frame and a scheduled transmission signal space, the request signal space including a plurality of request segments each having a different location defined within the at least one frame within the request signal space, the scheduled transmission signal space including a plurality of scheduled transmission segments each having a different location within the scheduled transmission signal space, the request sent in a request segment that is one of the plurality of request segments; (b) at the second node, making an assignment associating the request with a scheduled transmission segment selected from the plurality of scheduled transmission segments, the assignment taking into account location of the request within the request signal space, and sending a corresponding assignment message; (c) at the second node, receiving a data transmission from the first node in the scheduled transmission segment associated with the request; and (d) wherein the plurality of scheduled transmission segments include multiple categories of scheduled transmission segments associated with different service types, and wherein the request is for transmission in a particular category of scheduled transmission segments associated with a particular service type. 14. An apparatus for conducting communications over a shared communication medium involving a plurality of nodes, comprising: (a) a first node configured to send a request to a scheduler over the shared communication medium, the shared communication medium organized to include a request signal space having at least one frame and a scheduled transmission signal space, the request signal space including a plurality of request segments each having a different location defined within the at least one frame within the request signal space, the scheduled transmission signal space including a plurality of scheduled transmission segments each having a different location within the scheduled transmission signal space, the first node configured to send the request in a request segment that is one of the plurality of request segments; (b) wherein the first node is configured to obtain an assignment from the scheduler associating the request with a scheduled transmission segment selected from the plurality of scheduled transmission segments, the assignment taking into account location of the request within the request signal space; (c) wherein the first node is configured to send a data transmission in the scheduled transmission segment associated with the request in accordance with the assignment; and (d) wherein the plurality of scheduled transmission segments include multiple categories of scheduled transmission segments associated with different service types, and wherein the request is for transmission in a particular category of scheduled transmission segments associated with a particular service type. 15. The apparatus of claim 14 wherein the plurality of request segments include multiple categories of requests segments, and wherein each category of request segments is used for requesting transmission in a particular category of scheduled transmission segments associated with a particular service type. 16. The apparatus of claim 15 wherein the request comprises 1 symbol in the request signal space. 17. The apparatus of claim 14 wherein the request comprises N symbols sent in the request signal space, N being a positive integer greater than zero. 18. The apparatus of claim 17 wherein the N symbols of the request are non-coherently detected. 19. The apparatus of claim 18 wherein the N symbols of the request specifies one out of 2N−1 service types. 20. The apparatus of claim 17 wherein the N symbols of the request are coherently detected. 21. The apparatus of claim 20 wherein the N symbols of the request are modulated according to a modulation scheme. 22. The apparatus of claim 21 wherein the modulation scheme is an M-ary differential phase shift keying (M-DPSK) modulation scheme. 23. The apparatus of claim 22 wherein the N symbols of the request specifies one out of MN−1 servicetypes where M is greater than zero. 24. The apparatus of claim 20 wherein the N symbols of the request are coded according to a coding scheme. 25. The apparatus of claim 24 wherein the coding scheme is a block coding scheme. 26. An apparatus for conducting communications over a shared communication medium involving a plurality of nodes, comprising: (a) a second node configured to receive a request from a first node, the shared communication medium organized to include a request signal space having at least one frame and a scheduled transmission signal space, the request signal space including a plurality of request segments each having a different location defined within the at least one frame within the request signal space, the scheduled transmission signal space including a plurality of scheduled transmission segments each having a different location within the scheduled transmission signal space, the second node configured to receive the request in a request segment that is one of the plurality of request segments; (b) wherein the second node is configured to make an assignment associating the request with a scheduled transmission segment selected from the plurality of scheduled transmission segments, the assignment taking into account location of the request within the request signal space, and sending a corresponding assignment message; (c) wherein the second node is configured to receive a data transmission from the first node in the scheduled transmission segment associated with the request; and (d) wherein the plurality of scheduled transmission segments include multiple categories of scheduled transmission segments associated with different service types, and wherein the request is for transmission in a particular category of scheduled transmission segments associated with a particular service type.