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A packet data generating method and apparatus for supporting multiple services in a wireless packet data communication system where an MS transmits two or more traffics to a BS on one of a reverse PDCH, a reverse FCH, and a reverse DCCH. To generate a PDU using non-signaling traffic and/or signaling

A packet data generating method and apparatus for supporting multiple services in a wireless packet data communication system where an MS transmits two or more traffics to a BS on one of a reverse PDCH, a reverse FCH, and a reverse DCCH. To generate a PDU using non-signaling traffic and/or signaling traffic for one of the reverse physical channels, a multiplex option is determined during service negotiations between the MS and the BS. The multiplex option defines a traffic format having a header and a payload including traffic data, and the header includes a service reference identifier field, a length indicator field indicating the presence or absence of a length field, and the length field indicating the length of the traffic data. A PDU is generated by formatting a reverse traffic to have a header and a payload according to the determined multiplex option.

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What is claimed is: 1. A method of generating a protocol data unit (PDU) using non-signaling traffic and/or signaling traffic in a wireless packet data communication system, comprising the steps of: generating a first PDU by adding a header to a payload according to a specific PDU type, the header

What is claimed is: 1. A method of generating a protocol data unit (PDU) using non-signaling traffic and/or signaling traffic in a wireless packet data communication system, comprising the steps of: generating a first PDU by adding a header to a payload according to a specific PDU type, the header including a service reference identifier (sr_id) field for identifying the service type of the traffic, a length indicator field indicating the presence or absence of a length field, and the length field indicating the length of the payload; and generating a second PDU comprising primary traffic, signaling traffic, the first PDU, and a header including a mixed-mode MuxPDU type field, wherein the mixed-mode MuxPDU type field indicates whether the primary traffic is mixed with at least one of the signaling traffic and the first PDU. 2. The method of claim 1, wherein the step of generating the first PDU comprises omitting the length field if the length indicator field indicates the absence of the length field. 3. The method of claim 1, wherein the length field is 0 or 4 bits. 4. The method of claim 1, further comprising the steps of: generating a physical channel frame by connecting one or more PDU; and transmitting the physical channel frame on a predetermined channel. 5. The method of claim 4, wherein the predetermined channel is one of a reverse packet data channel, a reverse fundamental channel, and a reverse dedicated control channel. 6. The method of claim 4, wherein the step of generating a physical channel frame comprises the step of generating the physical channel frame such that a last PDU does not contain the length field. 7. The method of claim 1, wherein the first PDU uses a multiplex option having a 3-bit MUXPDU type field for identifying a plurality of muxPDU types, a 3-bit format descriptor field, a 2-bit data block size field, a 6-bit max data blocks field, and a 2-bit rate set field. 8. The method of claim 7, wherein the multiplex option is greater than 0×10. 9. The method of claim 7, wherein the multiplex option is one of 0×1301, 0×1302, 0×1305, and 0×1306. 10. The method of claim 7, wherein the multiplex option is formed according to the table shown in FIG. 8., incorporated herein by reference. 11. The method of claim 1, wherein the service reference identifier of the non-signaling traffic is set to “001” to “110”, respectively, and the service reference identifier of the signaling traffic set to “000”. 12. An apparatus for generating a protocol data unit (PDU), in a wireless packet data communication system where a mobile station (MS) transmits two or more traffics to a base station (BS) on one of a reverse packet data channel (PDCH), a reverse fundamental channel (FCH), and a reverse dedicated control channel (DCCH), using non-signaling traffic and/or signaling traffic for one of the reverse physical channels, comprising: a medium access control (MAC) layer unit for generating a first PDU by adding a header to a payload according to a specific PDU type, the header including a service reference identifier (sr_id) field for identifying the service type of the traffic, a length indicator field indicating the presence or absence of a length field, and the length field indicating the length of the payload, and generating a second PDU comprising primary traffic, signaling traffic, and the first PDU, and a header including a mixed-mode MuxPDU type field; and a physical layer unit for generating a physical channel frame by connecting one or more PDUs according to the type and data rate of the reverse physical channel, and transmitting the physical channel frame on the reverse physical channel, wherein the mixed-mode MuxPDU type field indicates whether the primary traffic is mixed with at least one of the signaling traffic and the first PDU. 13. The method of claim 12, wherein the mixed-mode muxPDU type is formed according to the table shown in FIG. 11B, incorporated herein by reference. 14. The method of claim 1, wherein the mix-mode muxPDU type is formed according to the table shown in FIG. 11B, incorporated herein by reference.