Apparatus for making a random access to the reverse common channel of a base station in CDMA and method therefor

Abstract

An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, comprises code synchronization detection information broadcast means provided in the base station for broadcasting the state information of a channel card in real time for the terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from the terminals through the reverse common channel, and data transmission determination means provided in the terminals for making the terminals to have attempted data transmission in the same time slot with the data of the code synchronization detection continuously transmit data and the other terminals stop data transmission.

What is claimed is: 
     
       1. An apparatus for making a plurality of terminals have a random access to the reverse common channel of a base station in CDMA, comprising:
 code synchronization detection information broadcast means provided in said base station for broadcasting the state information of a channel card in real time for said terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from said terminals through said reverse common channel; and   data transmission determination means provided in said terminals for making the terminals to have attempted data transmission in the same time slot with the data of said code synchronization detection continue data transmission and the other terminals stop data transmission.   
     
     
       2. An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 1 , wherein each of said terminals comprises:
 a data generator for generating the data transmitted to said base station;   a data transmitter for transmitting said data generated from said data generator;   a terminal RF signal processor for converting said data from said data transmitter into an RF signal transmitted to said base station and for processing an RF signal received from said base station;   a broadcast signal receiver for receiving a broadcast signal from said terminal RF signal processor to determine the data transmission; and   data transmission determination circuit for controlling said data transmitter to determine whether to make an attempt of transmitting data or to keep on transmitting the data presently under transmission according to said broadcast signal.   
     
     
       3. An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 2 , wherein, when said data transmission determination circuit receives a broadcast signal representing the detection of the code synchronization in a time slot from said base station, it holds the data transmission until receiving a broadcast signal representing the code synchronization not acquired when it does not perform data transmission or keeps on transmitting data when it has attempted the data transmission in the time slot corresponding to said broadcast signal or stops the data transmission performed in the time slot not corresponding to said broadcast signal and holds it until receiving a broadcast signal representing the code synchronization not acquired. 
     
     
       4. An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 3 , wherein said data transmission determination circuit determines the data transmission by receiving the broadcast signal representing the detection of the code synchronization in a time slot from said base station, the data transmission being determined by the first or second broadcast signal according as the ratio of the packet length to the slot length is 2 or 4. 
     
     
       5. An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 2 , wherein said data transmitter is designed to have a transmitted data unit consisting of the preamble and user's data, and the power of said preamble is set different from that of said user's data. 
     
     
       6. An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 2 , wherein said data transmitter performs the power control according to the power control bit transmitted after receiving the broadcast signal representing the detection of the received signal synchronization from said base station, and maintains a constant power level regardless of the power control bit transmitted upon receiving the broadcast signal representing the received signal synchronization not acquired from said base station. 
     
     
       7. An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 1 , wherein said base station comprises:
 a base station RF signal processor for receiving the RF signal transmitted from the terminal;   a data transceiver for demodulating the signal from said base station RF signal processor to deliver it to an upper hierarchy or another network or vice versa, said data transceiver generating a signal representing whether the received signal synchronization is acquired or no;   a detection determination circuit for receiving the resultant signal of the code synchronization used to determine whether the received signal is acquired or no upon completing the preamble of the data transmitted from said data transceiver;   a broadcast determination circuit for determining the information to broadcast to said terminals according to the detection of the received signal synchronization recognized by said detection determination circuit; and   a broadcast transmitter for controlling said base station RF signal processor to transmit the broadcast signal determined by said broadcast determination circuit at a prescribed power level in a prescribed time.   
     
     
       8. An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 7 , wherein said detection determination circuit determines the initial code synchronization and the tracking of the synchronization in a given time before completion of a preamble transmission to make said terminals perform the precise operation in the beginning of the slot. 
     
     
       9. An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 8 , wherein said detection determination circuit searches the codes around the beginning of each time slot for a duration that may vary from the length of the time slot to the length of the preamble. 
     
     
       10. An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 7 , wherein said broadcast determination circuit determines the broadcast signal only with a single bit representing the detection of the synchronization in the preamble. 
     
     
       11. An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 7 , wherein said broadcast transmitter transmits the broadcast signal determined by said broadcast determination circuit through an additional channel using a different code other than the presently used code at every time of completing the slot. 
     
     
       12. An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 7 , wherein said broadcast transmitter transmits the broadcast signal determined by said broadcast determination circuit at every time of completing the slot in the punctured form having the power control bit transmitted through the pilot channel and a time offset. 
     
     
       13. An apparatus for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 7 , wherein said broadcast transmitter transmits the broadcast signal determined by said broadcast determination circuit through an additional channel using a different code other than the presently use code at the boundary of each time slot. 
     
     
       14. A method for making a plurality of terminals have a random access to the reverse common channel of a base station in CDMA, comprising the steps of:
 broadcasting from said base station the state information of a channel card in real time for said terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from said terminals through said reverse common channel; and   making the terminals to have attempted data transmission in the same time slot with the data of said code synchronization detection continue data transmission and the other terminals stop data transmission.   
     
     
       15. A method for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 14 , wherein the step of making the terminals transmit data comprising the steps of:
 generating the data transmitted to said base station;   transmitting said data to said base station;   converting said data into an RF signal transmitted to said base station and processing a broadcast RF signal received from said base station;   receiving the converted broadcast RF signal to determine the data transmission; and   determining whether to make an attempt of transmitting data or to keep on transmitting the data presently under transmission according to said broadcast signal.   
     
     
       16. A method for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 15 , wherein the step of transmission determination comprises the step of holding the data transmission until receiving a broadcast signal representing the code synchronization not acquired when it does not perform data transmission or keeps on transmitting data when it has attempted the data transmission in the time slot corresponding to said broadcast signal or stops the data transmission performed in the time slot not corresponding to said broadcast signal and holds it until receiving a broadcast signal representing the code synchronization not acquired, when receiving a broadcast signal representing the detection of the code synchronization in a time slot from said base station. 
     
     
       17. A method for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 16 , wherein the step of transmission determination includes the further step of determining the data transmission by receiving the broadcast signal representing the detection of the code synchronization in a time slot from said base station, the data transmission being determined by the first or second broadcast signal according as the ratio of the packet length to the slot length is 2 or 4. 
     
     
       18. A method for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 15 , wherein the step of data transmission has a transmitted data unit consisting of the preamble and user's data, and the power of said preamble is set different from that of said user's data. 
     
     
       19. A method for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 15 , wherein the step of data transmission performs the power control according to the power control bit transmitted after receiving the broadcast signal representing the detection of the received signal synchronization from said base station, and maintains a constant power level regardless of the power control bit transmitted upon receiving the broadcast signal representing the received signal synchronization not acquired from said base station. 
     
     
       20. A method for making a plurality of terminals have a random access to the reverse common channel in CDMA, as defined in  claim 15 , wherein the step of broadcasting in said base station comprises the steps of:
 receiving the RF signal transmitted from the terminal;   demodulating the signal from said base station RF signal processor to deliver it to an upper hierarchy or another network or vice versa, and generating a signal representing whether the received signal synchronization is acquired or no;   receiving the resultant signal of the code synchronization used to determine whether the received signal is acquired or no upon completing the preamble of the data transmitted;   determining the information to broadcast to said terminals according to the detection of the received signal synchronization; and   controlling said base station to transmit the broadcast signal at a prescribed power level in a prescribed time.   
     
     
       21. A method for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 14 , wherein the step of broadcasting in said base station comprises the steps of:
 receiving the RF signal transmitted from the terminal;   demodulating the signal from said base station RF signal processor to deliver it to an upper hierarchy or another network or vice versa, and generating a signal representing whether the received signal synchronization is acquired or no;   receiving the resultant signal of the code synchronization used to determine whether the received signal is acquired or no upon completing the preamble of the data transmitted;   determining the information to broadcast to said terminals according to the detection of the received signal synchronization; and   controlling said base station to transmit the broadcast signal at a prescribed power level in a prescribed time.   
     
     
       22. A method for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in china  21 , wherein the step of receiving the resultant signal determines the initial code synchronization and the tracking of the synchronization in a given time before completion of a preamble transmission to make said terminals perform the precise operation in the beginning of the slot. 
     
     
       23. A method for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 22 , wherein the step of receiving the resultant signal searches the codes around the beginning of each time slot for a duration that may vary from the length of the time slot to the length of the preamble. 
     
     
       24. A method for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 21 , wherein the step of determining the information to broadcast determines the broadcast signal only with a single bit representing the detection of the synchronization in the preamble. 
     
     
       25. A method for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 21 , wherein the step of controlling said base station transmits the broadcast signal through using a different code other than the presently used code at every time of completing the slot. 
     
     
       26. A method for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 21 , wherein the step of controlling said base station transmits the broadcast signal at every time of completing the slot in the punctured form having the power control bit transmitted through the pilot channel and a time offset. 
     
     
       27. A method for making a plurality of terminals have a random access to the reverse common channel system in CDMA, as defined in  claim 21 , wherein the step of controlling said base station transmits the broadcast signal through using a different code other than the presently used code at the boundary of each time slot. 
     
     
       28. An apparatus for making a plurality of terminals have a random access to the reverse common channel of a base station in CDMA, comprising:
 code synchronization detection information broadcast means provided in said base station for broadcasting the state information of a channel card in real time for said terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from said terminals through said reverse common channel; and   data transmission determination means provided in said terminals for making the terminals to have acquired the code synchronization of the transmitted preambles in said base station continue data transmission and the other terminals stop data transmission,   wherein each of said terminals comprises:   a data generator for generating the data transmitted to said base station;   a data transmitter for transmitting said data generated from said data generator;   a terminal RF signal processor for converting said data from said data transmitter into an RF signal transmitted to said base station and for processing an RF signal received from said base station;   a broadcast signal receiver for receiving a broadcast signal from said terminal RF signal processor to determine the data transmission; and   data transmission determination circuit for controlling said data transmitter to determine whether to make an attempt of transmitting data or to keep on transmitting the data presently under transmission according to said broadcast signal,   wherein, when said data transmission determination circuit receives a broadcast signal representing the detection of the code synchronization in a time slot from said base station, it holds the data transmission until receiving a broadcast signal representing the code synchronization not acquired when it does not perform data transmission or keeps on transmitting data when it has attempted the data transmission in the time slot corresponding to said broadcast signal or stops the data transmission performed in the time slot not corresponding to said broadcast signal and holds it until receiving a broadcast signal representing the code synchronization not acquired.   
     
     
       29. An apparatus for making a plurality of terminals have a random access to the reverse common channel of a base station in CDMA, comprising:
 code synchronization detection information broadcast means provided in said base station for broadcasting the state information of a channel card in real time for said terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from said terminals through said reverse common channel; and   data transmission determination means provided in said terminals for making the terminals to have acquired the code synchronization of the transmitted preambles in said base station continue data transmission and the other terminals stop data transmission,   wherein each of said terminals comprises:
 a data generator for generating the data transmitted to said base station; 
 a data transmitter for transmitting said data generated from said data generator; 
 a terminal RF signal processor for converting said data from said data transmitter into an RF signal transmitted to said base station and for processing an RF signal received from said base station; 
 a broadcast signal receiver for receiving a broadcast signal from said terminal RF signal processor to determine the data transmission; and 
 data transmission determination circuit for controlling said data transmitter to determine whether to make an attempt of transmitting data or to keep on transmitting the data presently under transmission according to said broadcast signal, 
 wherein said data transmitter is designed to have a transmitted data unit consisting of the preamble and user's data, and the power of said preamble is set different from that of said user's data. 
   
     
     
       30. An apparatus for making a plurality of terminals have a random access to the reverse common channel of a base station in CDMA, comprising:
 code synchronization detection information broadcast means provided in said base station for broadcasting the state information of a channel card in real time for said terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from said terminals through said reverse common channel; and   data transmission determination means provided in said terminals for making the terminals to have acquired the code synchronization of the transmitted preambles in said base station continue data transmission and the other terminals stop data transmission,   wherein said base station comprises:
 a base station RF signal processor for receiving the RF signal transmitted from the terminal; 
 a data transceiver for demodulating the signal from said base station RF signal processor to deliver it to an upper hierarchy or another network or vice versa, said data transceiver generating a signal representing whether the received signal synchronization is acquired or no; 
 a detection determination circuit for receiving the resultant signal of the code synchronization used to determine whether the received signal is acquired or no upon completing the preamble of the data transmitted from said data transceiver; 
 a broadcast determination circuit for determining the information to broadcast to said terminals according to the detection of the received signal synchronization recognized by said detection determination circuit; and 
   a broadcast transmitter for controlling said base station RF signal processor to transmit the broadcast signal determined by said broadcast determination circuit at a prescribed power level in a prescribed time.   
     
     
       31. A method for making a plurality of terminals have a random access to the reverse common channel of a base station in CDMA, comprising the steps of:
 broadcasting from said base station the state information of a channel card in real time for said terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from said terminals through said reverse common channel; and   making the terminals to have acquired the code synchronization of the transmitted preambles in said base station continue data transmission and the other terminals stop data transmission,   wherein the step of making the terminals transmit data comprising the steps of:
 generating the data transmitted to said base station; 
 transmitting said data to said base station; 
 converting said data into an RF signal transmitted to said base station and processing a broadcast RF signal received from said base station; 
 receiving the converted broadcast RF signal to determine the data transmission; and 
 determining whether to make an attempt of transmitting data or to keep on transmitting the data presently under transmission according to said broadcast signal, 
 wherein the step of transmission determination comprises the step of holding the data transmission until receiving a broadcast signal representing the code synchronization not acquired when it does not perform data transmission or keeps on transmitting data when it has attempted the data transmission in the time slot corresponding to said broadcast signal or stops the data transmission performed in the time slot not corresponding to said broadcast signal and holds it until receiving a broadcast signal representing the code synchronization not acquired, when receiving a broadcast signal representing the detection of the code synchronization in a time slot from said base station. 
   
     
     
       32. A method for making a plurality of terminals have a random access to the reverse common channel of a base station in CDMA, comprising the steps of:
 broadcasting from said base station the state information of a channel card in real time for said terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from said terminals through said reverse common channel; and   making the terminals to have acquired the code synchronization of the transmitted preambles in said base station continue data transmission and the other terminals stop data transmission,   wherein the step of making the terminals transmit data comprising the steps of:
 generating the data transmitted to said base station; 
 transmitting said data to said base station; 
 converting said data into an RF signal transmitted to said base station and processing a broadcast RF signal received from said base station; 
 receiving the converted broadcast RF signal to determine the data transmission; and 
 determining whether to make an attempt of transmitting data or to keep on transmitting the data presently under transmission according to said broadcast signal, 
 wherein the step of data transmission has a transmitted data unit consisting of the preamble and user's data, and the power of said preamble is set different from that of said user's data. 
   
     
     
       33. A method for making a plurality of terminals have a random access to the reverse common channel of a base station in CDMA, comprising the steps of:
 broadcasting from said base station the state information of a channel card in real time for said terminals to recognize the code synchronization detection when the code synchronization of a certain data is acquired through performing the code synchronization of the preambles transmitted from said terminals through said reverse common channel; and   making the terminals to have acquired the code synchronization of the transmitted preambles in said base station continue data transmission and the other terminals stop data transmission,   wherein the step of broadcasting in said base station comprises the steps of:
 receiving the RF signal transmitted from the terminal; 
 demodulating the signal from said base station RF signal processor to deliver it to an upper hierarchy or another network or vice versa, and generating a signal representing whether the received signal synchronization is acquired or no; 
 receiving the resultant signal of the code synchronization used to determine whether the received signal is acquired or no upon completing the preamble of the data transmitted; 
 determining the information to broadcast to said terminals according to the detection of the received signal synchronization; and 
 controlling said base station to transmit the broadcast signal at a prescribed power level in a prescribed time. 
   
     
     
       34. An apparatus for transmitting a data packet to a base station in a code division multiple access (CDMA) telecommunication system wherein a plurality of terminals randomly access to a reverse common channel, comprising:
 means for receiving state information broadcasted from the base station, the state information representing that a code synchronization of the data packet is acquired in the base station, wherein a code synchronization detection is performed based on a preamble of the data packet transmitted from the terminals through the reverse common channel; and   data transmission determination means for determining whether the code synchronization of the data packet is acquired or not based on the state information, allowing the terminal to transmit the data packet in the same time slot as the data packet of which the code synchronization is acquired if the code synchronization of the data packet is acquired, and allowing the terminal to stop transmission of the data packets if the code synchronization of the data packet is not acquired.   
     
     
       35. A terminal for transmitting a data packet to a base station in a code division multiple access (CDMA) telecommunication system wherein a plurality of terminals randomly access to a reverse common channel, comprising:
 a data generator for generating data packets to be transmitted to the base station;   a data transmitter for transmitting the data packets generated in said data generator;   a terminal RF signal processor for converting the data packets from said data transmitter into a radio frequency (.RF) signal and for processing an RF signal received from the base station;   a broadcast signal receiver for receiving a broadcast signal from said terminal RF signal processor, the broadcast signal representing that a code synchronization of the data packet is acquired in the base station, wherein a code synchronization detection is performed based on a preamble of the data packet transmitted from the terminals through the reverse common channel; and   data transmission determination circuit for determining whether the code synchronization of the data packet is acquired or not based on the broadcast signal, allowing the data transmitter to continue to transmit the data packet if the code synchronization of the data packet is acquired, and allowing the data transmitter to stop transmission of the data packets if the code synchronization of the data packet is not acquired.   
     
     
       36. The terminal as recited in  claim 35 , wherein the data transmitter is designed to have a transmitted data unit consisting of the preamble and user's data, and the power of the preamble is set different from that of the user's data. 
     
     
       37. A base station for making a plurality of terminals have a random access to a reverse common chancel in a code division multiple access (CDMA) system, comprising:
 a base station RF signal processor for receiving an RF signal transmitted from the terminal;   a data transceiver for demodulating the RF signal from said base station RF signal processor and generating a data packet to deliver it to an upper hierarchy or another network or vice versa, generating a signal representing whether a code synchronization of the data packet is acquired or not;   a detection determination means for determining whether the data packet is acquired or not upon completing a preamble of the data packet;   a broadcast determination means for determining information representing that the code synchronization of the data packet is acquired, to be broadcasted to the terminals if the code synchronization of the data packet is acquired; and   a broadcast transmitter for controlling the information representing that the code synchronization of the data packet is acquired, to be broadcasted to the terminals at a predetermined power level in a predetermined time.   
     
     
       38. The base station as recited in  claim 37 , wherein said detection determination means determines the initial code synchronization and the tracking of the synchronization in a given time before completion of a preamble transmission to make said terminals perform the precise operation in the beginning of the slot. 
     
     
       39. The base station as recited in  claim 37 , wherein said detection determination means searches the codes around the beginning of each time slot for a duration that may vary from the length of the time slot to the length of the preamble. 
     
     
       40. The base station as recited in  claim 39 , wherein said broadcast determination means determines the broadcast signal only with a single bit representing the detection of the synchronization in the preamble. 
     
     
       41. The base station as recited in  claim 39 , wherein said broadcast transmitter transmits the broadcast signal determined by said broadcast determination means through an additional channel using a different code other than the presently used code at every time of completing the slot. 
     
     
       42. The base station as defined in  claim 39 , wherein said broadcast transmitter transmits the broadcast signal determined by said broadcast determination means at every time of completing the slot in the punctured form having the power control bit transmitted through the pilot channel and a time offset. 
     
     
       43. A method for transmitting a data packet to a base station in a code division multiple access (CDMA) telecommunication system wherein a plurality of terminals randomly access to a reverse common channel, comprising the steps of:
 a) receiving state information broadcasted from the base station, the state information representing that a code synchronization of the data packet is acquired in the base station, wherein a code synchronization detection is performed based on a preamble of the data packet transmitted from the terminals through the reverse common channel; and   b) determining whether the code synchronization of the data packet is acquired or not based on the state information, allowing the terminal to transmit the data packet in the same time slot as the data packet of which the code synchronization is acquired if the code synchronization of the data packet is acquired, and allowing the terminal to stop transmission of the data packets if the code synchronization of the data packet is not acquired.   
     
     
       44. A method for transmitting a data packet to a base station in a code division multiple access (CDMA) telecommunication system wherein a plurality of terminals randomly access to a reverse common channel, comprising the steps of:
 a) at a data generator, generating data packets to be transmitted to the base station;   b) at a data transmitter, transmitting the data packets generated in the data generator;   c) at a terminal RF signal processor, converting the data packets into a radio frequency (RF) signal and for processing an RF signal received from the base station;   d) at a broadcast signal receiver, receiving a broadcast signal from said terminal RF signal processor, the broadcast signal representing that a code synchronization of the data packet is acquired in the base station, wherein a code synchronization detection is performed based on a preamble of the data packet transmitted from the terminals through the reverse common channel; and   e) at data transmission determination means, determining whether the code synchronization of the data packet is acquired or not based on the broadcast signal, allowing the data transmitter to continue to transmit the data packet if the code synchronization of the data packet is acquired, and allowing the data transmitter to stop transmission of the data packets if the code synchronization of the data packet is not acquired.   
     
     
       45. The method as recited in  claim 44 , wherein the data packet includes the preamble and user's data, and the power of the preamble is set different from that of the user's data. 
     
     
       46. A method for making a plurality of terminals have a random access to a reverse common channel in a code division multiple access (CDMA) system, comprising:
 a) at a base station RF signal processor, receiving an RF signal transmitted from the terminal;   b) at a data transceiver, demodulating the RF signal from said base station RF signal processor and generating a data packet to deliver it to an upper hierarchy or another network or vice versa, generating a signal representing whether a code synchronization of the data packet is acquired or not;   c) at a detection determination means, determining whether the data packet is acquired or not upon completing a preamble of the data packet;   d) at a broadcast determination means, determining information representing that the code synchronization of the data packet is acquired, to be broadcasted to the terminals if the code synchronization of the data packet is acquired; and   d) at a broadcast transmitter, for controlling the information representing that the code synchronization of the data packet is acquired, to be broadcasted to the terminals at a predetermined power level in a predetermined time.   
     
     
       47. The method as recited in  claim 46 , wherein in the step c) the codes are searched around the beginning of each time slot for a duration that may vary from the length of the time slot to the length of the preamble. 
     
     
       48. An apparatus for managing random access of a common channel by a plurality of terminals in a code division multiple access (CDMA) telecommunication system comprising:
 a receiver configured to receive a first preamble in a first time slot, wherein the first preamble is transmitted by a first one of the plurality of terminals using a reverse common channel;   a broadcast signal generator configured to generate a broadcast signal in response to the received first preamble; and   a broadcast transmitter configured to broadcast the broadcast signal, wherein the broadcast signal allows the first one of the plurality of terminals to determine whether or not to transmit a first user data associated with the first preamble and wherein the broadcast signal is indistinctive between at least two of the plurality of terminals including the first one of the plurality of terminals.    
     
     
       49. The apparatus of claim 48, wherein the broadcast signal allow a second one of the plurality of terminals to determine whether or not to transmit a second user data.  
     
     
       50. The apparatus of claim 47, wherein the receiver is further configured to receive the first user data in a second time slot, and wherein the second time slot is a predetermined number of time slots after the first time slot.  
     
     
       51. The apparatus of claim 47, wherein the broadcast signal that allows the first one of the plurality of terminals to determine to transmit the first user data is broadcasted only at a specific time that is a predetermined time interval after the beginning of the first time slot.  
     
     
       52. The apparatus of claim 47, wherein the broadcast signal that causes the first one of the plurality of terminals to transmit the first user data is broadcasted only at a specific time that is a predetermined time interval after the beginning of the first time slot.  
     
     
       53. The apparatus of claim 52, wherein the broadcast signal causes a second one of the plurality of terminals to transmit a second user data.  
     
     
       54. The apparatus of claim 52, wherein the receiver is further configured to receive the first user data in a second time slot, and wherein the second time slot is a predetermined number of time slots after the first time slot.  
     
     
       55. A method for managing random access of a common channel by a plurality of terminals comprising:
 receiving a first preamble a in a first time slot, wherein the first preamble is transmitted by a first one of the plurality of terminals using a reverse common channel;   generating a broadcast signal in response to the received first preamble; and   broadcasting the broadcast signal, wherein the broadcast signal allows the first one of the plurality of terminals to determine whether or not to transmit a first user data associated with the first preamble and wherein the broadcast signal is indistinctive between at least two of the plurality of terminals including the first one of the plurality of terminals.    
     
     
       56. The method of claim 55, wherein the broadcast signal allows a second one of the plurality of terminals to determine whether or not to transmit a second user data.  
     
     
       57. The method of claim 55, further comprising receiving the first user data in a second time slot, wherein the second time slot is a predetermined number of time slots after the first time slot.  
     
     
       58. The method of claim 55, wherein the broadcast signal that allows the first one of the plurality of terminals to determine to transmit the first user data is broadcasted only at a specific time that is a predetermined time interval after the beginning of the first time slot.  
     
     
       59. The method of claim 55, wherein the broadcast signal that causes the first one of the plurality of terminals to transmit the first user data is broadcasted only at a specific time that is a predetermined time interval after the beginning of the first time slot.  
     
     
       60. The method of claim 59, wherein the broadcast signal causes a second one of the plurality of terminals to transmit a second user data.  
     
     
       61. The method of claim 59, further comprising receiving the first user data in a second time slot, wherein the second time slot is a predetermined number of time slots after the first time slot.  
     
     
       62. A communication system comprising:
 a base station, a first terminal and a second terminal,
 wherein the first terminal is configured to transmit a first preamble in a first time slot using a reverse common channel; 
 wherein the base station is configured to receive the first preamble; 
 wherein the base station is configured to generate a broadcast signal in response to the received first preamble; 
 wherein the base station is configured to broadcast the broadcast signal and wherein the broadcast signal is indistinctive between the first terminal and the second terminal; and 
 wherein the first terminal is configured to receive the broadcast signal and to decide whether or not to transmit a first user data associated with the first preamble based on the received broadcast signal.  
   
     
     
       63. The system of claim 62, wherein the second terminal is configured to receive the broadcast signal and to decide whether or not to transmit a second user data based on the received broadcast signal.  
     
     
       64. The system of claim 62, wherein the first terminal is configured to transmit the first user data in a second time slot, and wherein the second time slot is a predetermined number of time slots after the first time slot.  
     
     
       65. The system of claim 62, wherein first terminal is configured to receive the broadcast signal that allows the first terminal to determine to transmit the first user data only at a specific time that is a predetermined time interval after the beginning of the first time slot.  
     
     
       66. The system of claim 62, wherein the first terminal is configured to receive the broadcast signal that causes the first terminal to transmit the first user data only at a specific time that is a predetermined time interval after the beginning of the first time slot.  
     
     
       67. The system of claim 66, wherein the second terminal is configured to receive the broadcast signal and transmit a second user data in response to the received broadcast signal.  
     
     
       68. The system of claim 66, wherein the first terminal is configured to transmit at least a portion of the first user data at a power level that differs from the power level at which the first preamble is transmitted.  
     
     
       69. A method for managing random access of a common channel by a first terminal and a second terminal comprising:
 transmitting, at the first terminal, a first preamble in a first time slot using a reverse common channel;   receiving the first preamble at a base station;   generating, at the base station, a broadcast signal in response to the received first preamble;   broadcasting the broadcast signal at the base station, wherein the broadcast signal is indistinctive between the first terminal and the second terminal;   receiving, at the first terminal, the broadcast signal; and   deciding, at the first terminal, whether or not to transmit a first user data associated with the first preamble based on the received broadcast signal.    
     
     
       70. The method of claim 69, further comprising:
 receiving, at the second terminal, the broadcast signal; and   deciding, at the second terminal, whether or not to transmit a second user data based on the received broadcast signal.    
     
     
       71. The method of claim 69, further comprising transmitting, at the first terminal, the first user data in a second time slot, wherein the second time slot is a predetermined number of time slots after the first time slot.  
     
     
       72. The method of claim 71, wherein at least a portion of the first user data is transmitted by the first terminal at a power level that differs from the power level at which the first preamble is transmitted.  
     
     
       73. The method of claim 69, wherein the broadcast signal that allows the first terminal to determine to transmit the first user data is received by the first terminal only at a specific time that is a predetermined time interval after the beginning of the first time slot.  
     
     
       74. The method of claim 69, wherein the broadcast signal that causes the first terminal to transmit the first user data is received by the first terminal only at a specific time that is a predetermined time interval after the beginning of the first time slot.  
     
     
       75. The method of claim 74, further comprising:
 receiving, at the second terminal, the broadcast signal; and   transmitting, at the second terminal, a second user data based on the received broadcast signal.    
     
     
       76. The method of claim 74, wherein at least a portion of the first user data is transmitted by the first terminal at a power level that differs from the power level at which the first preamble is transmitted.