MXPA00002147A - Packet data communications scheduling in a spread spectrum communications system - Google Patents

Abstract

In a spread spectrum communications system (10) supporting bursty uplink and downlink data packet transmission telecommunications services, significant concerns exist as to the generation of unacceptable levels of interference resulting from plural and simultaneous data packet transmissions. To address this concern, the system (10) selectively organizes an access schedule for mobile station uplink data packet transmissions and a delivery schedule for downlink data packet transmissions. For the uplink, the schedule is transmitted to plural mobile stations (16) in a current frame (e.g., frame n) and identifies which one or ones of plural mobile stations (16) are authorized to make an uplink data packet transmission in a next frame (e.g., frame n+1). Only those mobile stations (16) scheduled with authorization to make an access in the next frame (n+1) then transmit their data packets (or a portion thereof) to the base station (12) during that next frame (n+1). On the downlink, a notification of intended delivery is communicated to destination mobile stations (16) in a current frame (n). The system (10) then makes downlink delivery in accordance with the schedule to the destination mobile stations (16) in a next frame (n+1).

Description

PROGRAMMING OF DATA COMMUNICATIONS IN PACKAGE, IN A DISPERSED SPECTRUM COMMUNICATION SYSTEM BACKGROUND OF THE INVENTION Technical Field of the Invention The present invention relates to mobile communication systems and in particular to a system for programming uplink and downlink communications access for packet data communications. Description of Related Art The next generation of mobile communication systems (comprising, for example, broadband cellular systems) will be required to provide a wide selection of telecommunications services including voice, video and digital data (both in switched channel modes). as packages). As a direct result of the increased number of services available to the subscriber, the number of calls made is expected to increase significantly. This can result in a much higher traffic density in the limited communications resources of the system. In a broadband cellular system of the spread-spectrum type (multiple access with code division) each mobile station has access to its own set of uplink code channels for use in supporting the use of the available telecommunications services. These sets of uplink codes between mobile stations however, for synchronization aspects are not experienced as orthogonal to each other. Accordingly, interference to a limited degree occurs between mobile stations when multiple mobile stations simultaneously engage in call communications. Despite efforts to dynamically control transmission power levels and thus control interference, this experienced interference may increase to an unacceptable level, as an increasing number of mobile station calls are processed. The problem of prior interference is of particular concern in connection with the provision of packet data telecommunications services in the uplink. This is because the traffic handled by the communications system tends to be bursts in nature and it is very difficult to predict access to the service. If a significant number of these uplink bursts occur simultaneously, interference may occur between mobile stations at a level sufficient to impair or block successful communications, not only for the data telecommunications service but possibly for other telecommunications services alike. . Then, there is a need for a system and method for programming mobile station access to the uplink for the purpose of making a packet data communications transmission. In addition, similar concerns exist with respect to interference caused by data communications transmissions in downlink packets in bursts to the mobile station. In this way, there is also a need for a system and method for programming base station access to the downlink for the purpose of performing a packet data communications transmission. SUMMARY OF THE INVENTION In response to a request from a mobile station to effect an uplink data packet transmission, a telecommunications system grants the transmission access to the mobile station. A program for authorized mobile station access, to effect an uplink data packet transmission in a next frame, is then determined by the system, with the program transmitted from the base station to multiple mobile stations including the requesting mobile station in a current picture. Each mobile station programmed with authorization to perform an access in the following table, then transmits its data packet (or a portion thereof) to the base station during that next frame. The system, by selectively arranging the access program for mobile station data packet transmissions on a per-frame basis, effectively exercises control when mobile stations can perform uplink communications and thus controls the level of interference generated by transmissions from multiple mobile stations. With respect to the downlink, the telecommunications system determines a program for the transmission of data packets by a base station to the mobile stations served. According to this program, the base station transmits a notification in a current frame to a mobile destination station, that a data packet is about to be supplied in a next frame. In response thereto, the mobile station accesses the appropriate code channel and receives the message in the following table. BRIEF DESCRIPTION OF THE DRAWINGS A more complete understanding of the method and apparatus of the present invention can be achieved by reference to the following detailed description when taken in conjunction with the accompanying drawings wherein: Figure 1 is a schematic block diagram of a cellular communication system; Figure 2 is a flow chart illustrating the uplink packet data programming process of the present invention; Figure 3 is a table programming diagram illustrating operation of the process of Figure 2; Figure 4 is a table programming diagram in alternating mode, illustrating the operation of the process of Figure 2; Figure 5 is a flow chart illustrating the downlink packet data programming process of the present invention; Figure 6 is a table programming diagram, illustrating the operation of the process of Figure 5. DETAILED DESCRIPTION OF THE DRAWINGS Reference is now made to Figure 1, where a schematic block diagram of a communications system is illustrated. cellular 10, which provides a broadband cellular communications service of the spread spectrum type (multiple access with code division). The system 10 comprises a base station 12 in communication over an air interface 14 with a plurality of mobile stations 16. Although a wide selection of telecommunications services including voice, video and digital data (both in switched modes of channels and in packets) are supported by the system 10 using communications carried over the air interface 14, the present invention focuses only on the provision of data telecommunications services. The air interface 14 supports a number of logical channels mapped to one or more physical channels. In the context of data telecommunications services of the present invention, the logical channels of importance include the random access channel (RACH = Random Access Channel), the access grant channel (AGCH = Access Grant Channel), the channel of uplink programming (USCH = Uplink Scheduling Channel), the dedicated control channel (DCCH = Dedicated Control Channel), the forward access channel (FACH = Forward Access Channel), and the code channel of the mobile station (also referred to as a traffic channel, and then identified by TCH). The random access channel is the logical channel in which a mobile station 16 performs a random uplink access, using a random access message (RA = Random Access) to the system 10. The access granting channel is the logical channel wherein the system 10 authorizes, using an access granting message (AG = Access Grant), a scheduled (ie non-random) uplink access by the mobile station 10 in a given code channel. The uplink program channel is the logical channel in which the system 10 indicates, in an uplink programming message (US = Uplink Scheduling), the synchronization of frames (ie the program) authorized for the mobile station 16. to perform the uplink access. The forward access channel is the logical channel in which the system indicates, in a downlink delivery message (DD = Downlink Delivery), that a packet data provision is about to be made to a mobile station. The dedicated control channel is the logical channel that can be used alternately for communication of the messages RA, AG, US and DD, in order to reduce complexity, when the mobile station 16 makes simultaneous use of a telecommunications service in addition to the packet data service. Finally, the code channel of the mobile station (traffic) comprises the logical channel on which the mobile station 16 effects or receives a packet data transmission. Reference is now made in combination to Figures 1 and 2, wherein Figure 2 is a flow chart illustrating the uplink packet data programming process of the present invention. Assuming a mobile station 16 wishes to transmit a data packet. The mobile station 16 first transmits (TX = Transmits) a random access message (RA) over the random access channel (RACH) to the base station 12 (step 100). As an alternative, the random access message may be sent over the dedicated control channel (DCCH), in cases where the mobile station 16 simultaneously uses a telecommunications service in addition to the packet data service. The random access message includes any of the data package itself (if it is short); or an indication of the length of the data packet to be sent by the mobile station 16. If the random access message includes the data packet itself (as determined in step 102), once received (RX) by the base station 12, the system simply sends the data packet (step 104) to its destination. Otherwise, in response to receiving the random access message, the base station 12 transmits an access granting message (AG) to the mobile station 16 on the access granting channel (AGCH) (step 106). Again, the access grant message may be sent over the dedicated control channel and, in addition, in cases of soft transfer, it may be sent from multiple base stations. The access granting message includes information identifying the uplink (traffic) mobile station code channel (TCH) for use in transmitting the data packet, the downlink channel where the uplink programming channel ( USCH) is located. The access granting message may also include information identifying the time (ie frame location) when the mobile station is authorized to perform a packet data transmission. A determination is then made by the system regarding the number of frames required to transmit the mobile station data packet (step 108) and a program of mobile station accesses authorized by a next frame is determined (step 110). In response to receiving the access granting message, the mobile station 16 accesses the uplink programming channel and receives a transmitted uplink programming message (US) the frame phase setting (i.e. the time program in one or more arrival frames) authorized for the mobile station to perform one or more uplink accesses to transmit the data packet (step 112).

This uplink programming message may also include processing gain information (dispersion factor) to be used by the mobile station when performing its uplink communication. The transmission of the processing gain information with each programming message allows the system to exercise dynamic control of the processing gains employed by the individual mobile stations. Again, the uplink programming message can be sent over the dedicated control channel, and in addition in cases of soft transfer, it can be sent from multiple base stations. The action of step 112 for the mobile station accessing the uplink programming channel to receive the uplink programming message, may occur once each frame, or alternatively may occur each time it is required. This uplink programming message may also specifically contain information identifying which of the multiple mobile stations served is allowed to be uplink data packet transmissions from the following table. If the mobile station 16 is allowed (as indicated by the received uplink programming message) to effect an uplink data packet transmission in the following frame (decision stage 114) according to the program, the access granting message specifying the code channel of the mobile uplink (traffic) station (TCH) is accessed, the appropriate processing gain used, and the data packet (or a portion thereof) is transmitted in that following table (step 116) for subsequent reception of the base station. Alternately, all data packets are sent (using both subsequent tables as required) starting with the following table (step 116). If access is not granted in the frame, or if only a portion of the data packet is transmitted in that frame, the process then returns in loop 118 to step 110, to program the access of the mobile station, again receiving the Uplink programming message and determines in step 112 whether a remaining portion of the data packet can be transmitted in a subsequent successive frame. Looping 118 is performed for the required number of frames determined in step 108 that are required to complete packet data transmission. If loop information 118 is required if the complete data packet is transmitted starting with the following table. Once the data packet is completely received by the base station, the system sends the data packet (step 104) to its destination. Reference is now made to Figure 3, wherein a table programming diagram illustrating the operation of the process of Figure 2 is illustrated. Communications on various logical channels of the air interface in the system of Figure 1 occur in the Table 150. A number of sequential frames 150 labeled n-3 to n + 3 is illustrated in Figure 3. In addition, the random access channel (RACH), the access granting channel (AGCH) and the programming channel of Uplink (USCH), logical channels of the air interface, are also illustrated. Finally, code channels (TCHs) of the mobile station for uplink data packets (traffic) for three mobile stations (MSI, MS2 and MS3) are illustrated. In Table n-3, none of the mobile stations participates in an uplink data packet transmission. However, as indicated at 152, a base station uplink programming message is transmitted over the uplink programming channel. The transmitted message includes information identifying that the mobile station MSI is authorized to perform uplink data packet transmissions in a next frame (ie frame n-2). Turning to frame n-2, the mobile station MSI transmits its data packet (or a portion thereof) as indicated at 154 to the base station. Also, the mobile station MS2 sends a random access message (RA) on the random access channel (RACH) as indicated in 156, to the base station. This message includes an identification of the length of the data packet that the mobile station MS2 wishes to send. Further, as indicated at 158, the uplink programming channel comprises an uplink programming message transmission of the base station which includes information identifying that the mobile station MSI continues to be authorized to perform data packet transmissions. uplink in a following table (ie table n-1). Turning now to frame n-1, in response to receiving the random access message from the mobile station MS2, the base station transmits an access granting message in the access granting channel (AGCH) to the mobile station MS2, as indicated at 160. The access granting message includes information identifying the code channel of the uplink mobile station (traffic) (MS2-TCH) for use in transmitting the data packet, and the downlink channel in where the uplink programming channel (USCH) is located. The mobile station MSI further continues to transmit its data packet (or a portion thereof) as indicated at 162 to the base station. Further, as indicated at 164, the uplink programming channel comprises uplink programming message transmission to the base station, including information that identifies that the mobile station MSI continues to be authorized to perform link data packet transmissions. ascending in a next frame (ie frame n). Turning now to frame n, the system has determined, from the identified length of data packets that the mobile station MS2 wishes to send, the number of frames 150 required to transmit the data packet. Consider for this example that two tables are required. An uplink programming message of the base station is then transmitted, as indicated at 166, on the uplink programming channel, including information that identifies that the mobile station MSI continues to be authorized to perform data packet transmissions of uplink in a next frame (ie frame n + 1) and further that mobile station MS2 is authorized to make uplink data packet transmissions in a next frame (ie frame n + 1). The MSI mobile station also continues to transmit its data packet (or a portion thereof) as indicated at 168 in the base station. Also, the mobile station MS3 sends a random access message (RA) over the random access channel (RACH) as indicated at 170, to the base station. In frame n + 1, the mobile station MSI terminates its continuous transmission of its data packet (or a portion thereof) as indicated at 172 to the base station. In addition, the mobile station MS2 initiates the transmission of its data packet (comprising a first portion thereof) as indicated at 174, to the base station. A base station uplink programming message is also transmitted, as indicated at 176 on the uplink programming channel including information that identifies that the mobile station MS2 continues to be authorized to perform uplink data packet transmissions in a next frame (ie frame n + 2). Also, in response to receiving the random access message from the mobile station MS3, the base station transmits an access granting message in the access granting channel (AGCH) to the mobile station MS3 as indicated at 178. The message access granting includes information identifying the uplink mobile station (traffic) code channel (MS3-TCH) for use in transmitting the data packet, and the downlink channel where the programming channel is located uplink (USCH). In table n + 2, the mobile station MS2 terminates its continuous transmission of its data packet (or a portion thereof) as indicated at 180 to the base station. The system has further determined from the identified length of the data packet, which the mobile station MS3 wishes to send, the number of frames 150 required to transmit the data packet. Consider for this example that a table is required. A base station uplink programming message is then transmitted, as indicated at 182, on the uplink programming channel including information identifying that the mobile station MS3 is authorized to perform an uplink data packet transmission in a next frame (ie frame n + 3). In frame n + 3, mobile station MS3 initiates and completes the transmission of its data packet as indicated at 184 to the base station. As each mobile station uses its own set of spreading codes for these data packet transmissions in the mobile station code (traffic) channel (TCH), it is possible for several mobile stations to simultaneously transmit all or portions of their data packets. respective. This is illustrated in table n + 1 at 172 and 174, where both the mobile station MSI and the mobile station MS2 have been authorized by the uplink programming message transmitted by the base station to simultaneously perform data packet transmissions in their respective code channels. In addition, the system can selectively choose which one or more of the multiple mobile stations sd be granted authorization in the transmitted uplink programming message to effect a data packet transmission in the following table. By selectively choosing authorized access, the system performs control over the communications load carried at the air interface. In this way, some control over the interference can be made by intelligently organizing and programming mobile station accesses in the code channel to participate in burst data packet transmissions. This is illustrated in tables n + 2 and n + 3. As discussed above, the base station transmits in the n + 2 table, an uplink programming message, as indicated at 182, on the uplink programming channel including information identifying that the mobile station MS3 is authorized to performing an uplink data packet transmission 184 in a following frame (ie frame n + 3). If, on the other hand, the system recognizes that the uplink data packet transmission of the mobile station MS3 in frame n + 3 will result in unacceptable levels of interference, probably due to other simultaneous uses (not shown) the system can manage intelligently (ie, schedule) the access for transmission of data packets and instead send the uplink programming message as indicated at 182 'on the uplink programming channel in the n + 3 table , to grant authorization to the mobile station MS3 for an uplink data packet transmission 184 'in a subsequent frame. The programming and administration functions performed in accordance with the present invention are implemented either in the base station or in the mobile switching center of the system of Figure 1. 4A, reference is made to Figure 4, where a table programming diagram in alternate mode, illustrating the operation of the process of Figure 2. Again, a number of sequential frames 150 labeled n-3 to n + 3 are illustrated in Figure 4. To simplify this illustration, wit However, only the uplink programming channel (USCH) and the uplink data packet (traffic) mobile station code channels (TCHs) for the three mobile stations (MSI), MS2 and MS3) of the air interface are illustrated. There is no explicit discussion of the transmission, evaluation, random access message programming or access grant message transmission operation (see Figure 3). In Table n-3, none of the mobile stations participates in an uplink data packet transmission. However, as indicated at 192, a base station uplink programming message transmission is performed in the uplink programming channel, the message transmission includes information that identifies that the mobile station MS2 is authorized to transmit the message. Performing transmissions of uplink data packets in one or several arrival tables. In this specific instance, the authorization is made for transmission starting in a next frame (ie frame n-2) and lasts as many frames as required to complete the transmission. This then differs from the embodiment of Figure 3 where the authorization is given in the uplink programming message for transmission only in the following table. In this simplified illustration, it is considered that the mobile station MS2 has already made its random access, a determination has been made by the system as to the number of frames required for transmission, a program for the transmission has been determined and a access granting message. Turning to frame n-2, mobile station MS2 initiates the transmission of its data packet as indicated in 194, to the base station. This transmission 194 will continue for a duration of just over three frames 150. Also, as indicated in 196, the uplink programming channel comprises uplink programming message transmission in the base station, including information identifying that the mobile station MSI is authorized uplink data packet transmissions in a next frame (ie frame n-1). Again, it considers that the mobile station MSI has already made its random access, a determination has been made by the system regarding the number of frames required for the transmission, a program for transmission has been determined, and a message of granting of access. Turning now to frame n-1, the mobile station MS2 continues its data packet transmission 194. In addition, the mobile station MSI begins and completes the transmission of its data packet as indicated at 198 to the base station. Turning now to frame n, mobile station MS2 continues its data packet transmission 194. Also, as indicated at 200, the uplink programming channel comprises a base station uplink programming message transmission, which it includes information that identifies that the mobile station MSI and the mobile station MS3 are each authorized to make uplink data packet transmissions in one or more arrival tables and in particular starting from a following table (ie table n + 1 ). Again, it is considered that the mobile stations MSI and MS3 have made their random accesses, determinations have been made by the system regarding the number of frames required for each transmission, a programming for the transmissions has been determined, and the access granting messages. In frame n + 1, the mobile station MSI begins transmission to the base station of its data packet as indicated at 202. This transmission 202 will continue for a duration of a little more than one frame. Also, the mobile station MS3 begins transmission to the base station of its data packet as indicated at 204. This transmission 204 will continue for a duration of three frames 150. Finally, the mobile station MS2 completes its data packet transmission 194 In table n + 2, the mobile station MSI completes its data packet transmission 202. In addition, the mobile station MS3 continues with its data packet transmission 204. Also, as indicated at 206, the uplink programming channel comprises a base station uplink programming message transmission that includes information identifying that authorizes mobile station MS2 to perform uplink data packet transmissions in one or more arrival frames and in particular starting in a next frame (ie frame n + 3). Again, it is considered that the mobile station MS2 has already made its random access, a determination has been made by the system as to the number of frames required for the transmission, a program for the transmission has been determined, and it has been sent a message granting access. In frame n + 3, mobile station MS3 completes its data packet transmission 204. Also, mobile station MS2 begins transmitting its data packet, as indicated at 208 to the base station. This transmission 208 will continue for a duration of at least one frame 150. Reference is now made in combination to Figures 1 and 5, wherein Figure 5 is a flow diagram illustrating the process of programming data in downlink packet. of the present invention. Assuming that the system 10 wishes to transmit a data packet to a particular mobile station 16. The system first evaluates the downlink data packet in the current downlink load context in step 300. This evaluation may include considering the number of tables required to carry out the transmission. The system then programs the downlink transmission with other downlink transmissions (step 302). Then, in appropriate frame instances, a downlink send message is transmitted (step 304) on the forward access channel (FACH) by the base station during a current frame over the air interface to a mobile destination station for the data package. As an alternative, the downlink send message may be sent over the dedicated control channel (DCCH) in instances where the mobile station 16 simultaneously makes use of a telecommunications service in addition to the packet data service. In this context, it is understood that multiple of the downlink sending messages can be sent simultaneously to multiple destination mobile stations (for corresponding transmissions of multiple data packets). Each message includes an indication not only that a downlink supply will be made starting from a next frame, but also from the code channel that the destination mobile station must access to receive the send. The message may further include processing gain information (spreading factor) for use by the mobile station in receiving the downlink communication. The transmission of the processing gain information with each indication message allows the system to exercise dynamic control of the processing gains used by the individual mobile stations. Then a transmission is made in the following table by the base station, for the mobile station reception, of each data packet programmed in frame (step 306). Referring now to Figure 6, wherein a table programming diagram illustrating the operation of the process of Figure 5 is illustrated. Again, a number of sequential frames 150 labeled n-3 to n + 3 is illustrated in FIG. Figure 6. With respect to downlink programming, this illustration uses the forward control channel (FACH) and the downlink data packet (traffic) mobile station code channels (TCHs) for three mobile stations (MSI). , MS2 and MS3) of the air interface. In Table n-3, none of the mobile stations receives a downlink data packet transmission. However, as indicated at 210, a downlink send message transmission is made in the forward control channel. This message transmission includes information that identifies that the mobile station MS3 is informed of a downlink data packet transmission above that departs in a following frame (ie frame n-2). The information may be specific to only the following table (compare to the uplink process illustrated in Figure 3), or indicates that the transmission will last as many frames as required to complete the transmission (compare with the uplink process illustrated in Figure 4). In this simplified illustration, it is considered that the system has already received the data packet for the mobile station MS3, has evaluated the downlink loading conditions and appropriately determined the program for transmission. Turning now to frame n-2, the system initiates the transmission of the data packet as indicated at 212, to the mobile station MS3. In one embodiment, this transmission 212 will continue for a duration of two frames 150. In another mode, it may continue in a second frame if another downlink message is sent to the mobile station MS3 in frame n-2 (as indicated in 214). Turning now to frame n-1, the system completes the sending of the downlink data packet transmission 212 to the mobile station MS3. In addition, a downlink send message transmission is made in the forward control channel as indicated at 216. This message transmission includes information that identifies that the mobile stations MSI and MS2 are informed of data packet transmissions of Downlink of val, each one that starts in a next frame (ie frame n). In this simplified illustration, it is considered that the system has already received the data packets for the mobile stations MSI and MS2, has evaluated the downlink loading conditions and has appropriately determined the program for the transmission. Turning now to frame n, the system starts transmission of the data packets as indicated at 218 and 220, to the mobile stations MSI and MS2 respectively. The transmission 218 to the mobile station MSI will continue for a duration of a little more than three frames 150. The transmission 220 to the mobile station MS2, on the other hand, lasts only one frame 150. In the table n + 1, transmission 218 continues. In addition, a downlink send message transmission is performed in the forward control channel as indicated at 222. This message transmission includes information that identifies that the mobile stations MS2 and MS3 are informed of data packet transmissions of downlink of arrival, each departing in a following table (ie table n + 2). In this simplified illustration, it is considered that the system has already received the data packets for the mobile stations MS2 and MS3, has evaluated downlink load conditions and has appropriately determined the program for transmission.

In frame n + 2, transmission 218 continues. In addition, the system initiates the transmission of the data packets as indicated at 224 and 226 to the mobile stations MS2 and MS3, respectively. The transmission 224 to the mobile station MS2 will continue for a duration of two frames 150. The transmission 226 to the mobile station MS3 on the other hand, will last at least two frames 150. As each mobile station uses its own set of scatter codes to receive These data packet transmissions, in the code channel of the downlink (traffic) mobile station (TCH), it is possible for several data packets to be transmitted simultaneously by the system to multiple mobile stations. This is illustrated in several instances in Figure 6. In addition, the system can selectively choose which one or more of the data packets should be transmitted to the multiple mobile stations in each frame. By selectively choosing the downlink transmission, the system performs control over the communications load carried at the air interface. In this way, some control over interference can be achieved by intelligently organizing and programming downlink transmissions to mobile stations with respect to burst data packet transmissions. If the system recognizes that a downlink data packet transmission per mobile station in a certain frame will result in unacceptable levels of interference, probably due to other simultaneous uses (not shown), the system can intelligently manage (i.e. program ) that downlink data packet transmission for a different frame. The programming and administration functions are performed in accordance with the present invention, are implemented either in the base station or in the mobile switching center of the system of Figure 1. Although preferred embodiments of the method and apparatus of the present invention have been illustrated in the accompanying Drawings and described in the above Detailed Description, it will be understood that the invention is not limited to the described modes but that it is capable of numerous rearrangements, modifications, and substitutions without departing from the spirit of the invention as set forth and defined in the following claims.

Claims (39)

1. A dispersed spectrum communication system, characterized in that it comprises: a plurality of mobile stations, certain of those mobile stations have data packets for uplink communication; and a base station in radio frequency communication over a dispersed-spectrum air interface with a plurality of mobile stations, the base station responds to access requests from certain of the mobile stations by programming frame access for the uplink communication of data packet, the program communicated on the air interface to the mobile stations and the program also identifies times in one or more arrival tables where one or more of certain mobile stations are authorized to perform uplink data packet communications , coded dispersed over the air interface.

2. The system according to claim 1, characterized in that the dispersed-spectrum communication system comprises a multiple-access cellular communication system with code division.

The system according to claim 1, characterized in that the program communicates on the air interface in a control channel.

The system according to claim 3, characterized in that the control channel comprises a common downlink control channel for mobile stations used to schedule uplink traffic.

The system according to claim 3, characterized in that the control channel comprises a control channel dedicated to a mobile station.

The system according to claim 1, characterized in that the access requests for certain mobile stations are transmitted on a common uplink control channel, used to access the system.

The system according to claim 1, characterized in that the access requests of certain mobile stations are transmitted on an uplink control channel dedicated to the mobile station.

The system according to claim 1, characterized in that the access requests of certain mobile stations includes an indication of a length for the data packet for uplink communication.

9. The system according to claim 1, characterized in that the access requests from certain mobile stations include the data packet itself, the base station responds to access requests from certain mobile stations that include the data packet itself when sending the packet of data received for shipment.

The system according to claim 1, characterized in that the program communicates over the air interface to the mobile stations in a current frame and the program further identifies authorizations to perform scrambled coding uplink data packet communications, over the air interface in a next frame.

The system according to claim 1, characterized in that the program includes processing gain information (dispersion factor) to be used by certain mobile stations to perform their uplink data packet communications.

The system according to claim 1, characterized in that the program also identifies times in one or more arrival frames where multiple of certain mobile stations are authorized to perform uplink data packets of simultaneous dispersed coding over the air interface.

13. The method for use in a spread spectrum communication system for programming uplink communications access, characterized in that it comprises the steps of: receiving from multiple mobile stations, access request messages each indicative of a desire to perform a Uplink data packet communication; program, in response to received access request messages, frame access for uplink communication of data packet; transmitting during a current frame, a program that identifies times in one or more arrival tables where one or some of certain mobile stations are authorized to perform communications of uplink data packets of dispersed coding; and receiving scrambled coding uplink data packet communications from the authorized mobile stations program.

The method according to claim 13, characterized in that the dispersed-spectrum communication system comprises a multiple-access cellular communication system with code division.

The method according to claim 13, characterized in that the step of transmitting the program comprises the step of transmitting the program in a control channel of dispersed-spectrum communications system.

The method according to claim 15, characterized in that the control channel comprises a common downlink control channel for mobile stations used to schedule uplink traffic.

The method according to claim 15, characterized in that the control channel comprises a control channel dedicated to a mobile station.

The method according to claim 13, characterized in that the step of receiving the access request messages comprises the step of receiving the access request messages on a common uplink control channel used to access the system.

The method according to claim 13, characterized in that the step of receiving the access request messages comprises the step of receiving the access request messages on an uplink control channel dedicated to the mobile station.

The method according to claim 13, characterized in that the step of programming further includes the steps of: determining a number of frames required for complete communication of each mobile station data packet; and take into account in the programmed table, access for data packet communications that require multiple tables.

The method according to claim 13, characterized in that the access request messages include an indication of a length for the data packet for uplink communication.

The method according to claim 13, characterized in that the access request messages include the data packet itself, the method further includes the step of responding to access request messages that include the data packet itself when sending the data package received for shipment.

The method according to claim 13, characterized in that the step of transmitting the program comprises the step of sending the program during a current frame, with the program identifying authorizations to perform uplink data packet communications, coding scattered over the air interface in a next frame.

The method according to claim 13, characterized in that the program includes processing gain information (dispersion factor) to be used by certain mobile stations to perform their communications of uplink data packets.

25. The system according to claim 13, characterized in that the step of transmitting the program comprises the step of sending the program identifying times in one or several arrival tables, where multiple of certain mobile stations are authorized to perform packet communications uplink data encoding simultaneously dispersed.

26. A dispersed-spectrum communication system, characterized in that it comprises: a plurality of mobile stations, certain of those mobile stations comprise destinations for communications of downlink data packets; and a base station in radio frequency communication over a dispersed-spectrum air interface, with the plurality of mobile stations, the base station responds to reception of a data packet for downlink communication by programming frame access for communication of downlink of data packets, the program identifies times in one or several arrival tables for data packet downlink sending, the program is executed to transmit on air interface to the destination mobile stations an indication of the intended shipment and perform communications of downlink data packets of scattered code on the air interface at identified times.

The system according to claim 26, characterized in that the spread spectrum communication system comprises a multiple access cellular communication system with code division.

28. The system according to claim 26, characterized in that the indication is communicated on the air interface in a control channel.

29. The system according to claim 28, characterized in that the control channel comprises a common downlink control channel for mobile stations used to provide downlink provisioning indications.

30. The system according to claim 28, characterized in that the control channel comprises a control channel dedicated to a mobile station.

The system according to claim 26, characterized in that the program is executed to transmit on the air interface to the mobile destination stations, an indication during a current frame of the intended shipment and to perform communications of downlink data packets. of scattered coding on the air interface during a next frame.

32. The system according to claim 31, characterized in that the indication includes processing gain information (dispersion factor) to be used by the certain mobile stations when receiving downlink data packet communications.

33. A method for use in a spread spectrum communication system for scheduling downlink communications, characterized in that it comprises the steps of: program in response to a received downlink data packet, frame access for communication of downlink of data packets at certain times in one or several arrival tables; transmitting an indication to certain or certain of the mobile stations with respect to the intended sending of a downlink data packet communication; and transmitting data packets of downlink data, of dispersed coding, according to the programming to the certain mobile stations.

34. The method according to claim 33, characterized in that the spread spectrum communication system comprises a multiple access cellular communication system with code division.

35. The method according to claim 33, characterized in that the step of transmitting the indication comprises the step of transmitting the indication in a control channel of the spread spectrum communication system.

36. The method according to claim 35, characterized in that the control channel comprises a common downlink control channel for mobile stations used to provide downlink sending indications.

37. The method according to claim 35, characterized in that the control channel comprises a control channel dedicated to a mobile station.

38. The method according to claim 33, characterized in that the cover for transmitting an indication comprises the step of transmitting during a current frame the indication to the certain mobile stations, that a downlink data packet communication is to be sent. in a following box; and wherein the step of transmitting data packet communications comprises the step of transmitting the scattered code downlink data packet communications according to the programming to the certain mobile stations during the next frame.

39. The method according to claim 33, characterized in that the indication includes gain information processing (spreading factor) for use by certain mobile stations when receiving downlink data packet communications. SUMMARY OF THE INVENTION In a spread spectrum communication system (10) that supports downlink and uplink data packet transmission telecommunications services in bursts, there are significant concerns regarding the generation of unacceptable levels of interference that result of multiple and simultaneous data packet transmissions. To address this concern, the system (10) selectively organizes an access program for transmissions of mobile station uplink data packets and a send program for uplink data packet transmissions. For the uplink, the program is transmitted to multiple mobile stations (16) in a current frame (eg frame n) and identifies which one or more of multiple mobile stations (16) are authorized to perform a link data packet transmission ascending in a next frame (for example, frame n + 1). Only those mobile stations (16) programmed with authorization to perform an access in the following table (n + 1) then transmit their data packets (or a portion thereof) to the base station (12) during that following table (n +1) In the downlink, a shipping notification is communicated 17997 intended to the destination mobile stations (16) in a current frame (n). The system (10) then performs downlinking according to the program to the destination mobile stations (16) in a following table (n + 1). 17997