Embodiment
To be terminal compare the parameter information of each available carrier wave to a kind of mode of the embodiment of the invention, and determine the available carrier wave that priority is the highest according to comparative result, inserts at random by the highest available carrier wave of determining of priority.The another kind of mode of the embodiment of the invention is that terminal is determined the available carrier wave in the system; Described terminal is selected an available carrier wave at random from the described available carrier wave of determining; Described terminal inserts at random by the available carrier wave of selecting.Because terminal can insert at random by the available carrier wave of self selecting, thereby reduce the collision probability that inserts at random, improve the probability of success that inserts at random.
Below in conjunction with Figure of description the embodiment of the invention is described in further detail.
As shown in Figure 2, the system that inserts at random of the embodiment of the invention comprises: base station 10 and terminal 20.
Terminal 20, be used for determining the parameter information of each available carrier wave of system, the parameter information of each available carrier wave is compared, and determine the available carrier wave that priority is the highest, carry out access operation at random by the highest available carrier wave and the base station of determining 10 of priority according to comparative result.
In specific implementation process, base station 10 sends the broadcast of the parameter information that comprises each available carrier wave;
Then terminal 20 is determined the parameter information of each available carrier wave in the system from the broadcast of receiving.Perhaps
Terminal 20 sends to base station 10 and obtains message; Base station 10 receive obtain message after, send the feedback message of the parameter information that comprises each available carrier wave to terminal 20; Terminal 20 is determined the parameter information of each available carrier wave from the feedback message of receiving.
Need to prove that present embodiment is not limited to above-mentioned two kinds of modes of obtaining the parameter information of available carrier wave, any mode that can make terminal 20 obtain the parameter information of available carrier wave all is suitable for present embodiment.
Wherein, the parameter information of available carrier wave includes but not limited to one or more in the following parameters information:
The load of PRACH (Physical Random Access Channel) resource of the frequency of numerical priority value, carrier wave, the bandwidth of carrier wave, carrier wave, the Preamble (inserting pilot frequency sequence at random) of carrier wave sign indicating number, carrier wave, other carrier wave (for example insert relevant parameter at random, the maximum transmit power of Preamble sign indicating number, Msg3 HARQ (Msg3HARQ Hybrid Automatic Repeat Request, the automatic repeat requests of the mixing of random accessing message 3) maximum retransmission etc.).
If parameter information is a numerical priority value, be 0~8 such as priority limit, the base station can be made as 1 with the priority of carrier wave 1 so, and the priority of carrier wave 2 is made as 2, sends it to terminal by broadcast then; Preferable, the base station can be adjusted the priority of different carrier dynamically, reaches the balanced purpose that inserts at random.
In order to improve the flexibility of system, the base station 10 of present embodiment can also indicate terminal 20 to insert at random according to priority mode or according to the prior art mode.Concrete,
Base station 10 is determined which kind of access way at random is terminal 20 adopt, and then is sent indication information according to predefined network strategy.
Such as, require terminal 20 to adopt priority mode, then the indication information of Fa Songing is to be used for the indication information (such as sending 0) that indicating terminal adopts priority mode to insert at random, terminal 20 just knows that after receiving 0 the employing priority mode inserts at random;
Require terminal 20 to adopt the mode of prior art, then the indication information of Fa Songing is to be used for the indication information (such as sending 1) that mode that indicating terminal adopts prior art inserts at random, and terminal 20 adopts the mode of prior art to insert at random with regard to knowing receiving after 1.
Need to prove that present embodiment is not limited to 0 and 1 indicating mode, the mode that other can indicating terminal all is suitable for present embodiment.
As shown in Figure 3, first kind of terminal of the embodiment of the invention comprises: information determination module 200, first carrier determination module 210 and first be access module 220 at random.
Information determination module 200 is used for determining the parameter information of each available carrier wave of system.
Wherein, the parameter information of available carrier wave includes but not limited to one or more in the following parameters information:
The load of the PRACH resource of the frequency of numerical priority value, carrier wave, the bandwidth of carrier wave, carrier wave, the Preamble sign indicating number of carrier wave, carrier wave, other carrier wave insert relevant parameter (for example, the maximum transmit power of Preamble sign indicating number, Msg3 HARQ maximum retransmission etc.) at random.
In specific implementation process, information determination module 200 is determined the parameter information of each available carrier wave in the system from the broadcast that the base station sends; Or
Message is obtained in transmission to the base station, and from the parameter information from definite each available carrier wave the feedback message of base station.
Need to prove that present embodiment is not limited to above-mentioned two kinds of modes of obtaining the parameter information of available carrier wave, any mode that can obtain the parameter information of available carrier wave all is suitable for present embodiment.
In specific implementation process, can also be with numerical priority value, the load of the PRACH resource of the frequency of carrier wave, the bandwidth of carrier wave, carrier wave, the Preamble sign indicating number of carrier wave, carrier wave, other carrier wave insert informix such as relevant parameter at random to be considered, and then definite priority.For example, the PRACH resource of the bandwidth of terminal known carrier wave and carrier wave, carry out priority ratio than the time, terminal will be given different weighted values to these two kinds of information, after the two quantification, multiply by weighted value more respectively, be the numerical priority value of this carrier wave after the gained results added.
First carrier determination module 210, the parameter information that is used for each available carrier wave that first carrier determination module 200 is determined compares, and determines the available carrier wave that priority is the highest according to comparative result.
Wherein, first carrier determination module 210 can pass through a kind of definite available carrier wave in the following manner:
The random access resource of each available carrier wave is compared (such as carrier bandwidths, available random access resource etc.), the available carrier wave that random access resource is maximum is defined as a highest available carrier wave of priority; Or
The load of each available carrier wave is compared, a minimum available carrier wave of load is defined as a highest available carrier wave of priority; Or
The attribute information of each available carrier wave is compared, attribute information is satisfied an available carrier wave that imposes a condition be defined as a highest available carrier wave of priority; Or
The available carrier wave that the numerical priority value of available carrier wave is the highest is defined as a highest available carrier wave of priority.
If attribute information is a frequency, the available carrier wave that first carrier determination module 210 is high or minimum with frequency is defined as a highest available carrier wave of priority, and just that centre frequency is a high or minimum available carrier wave is defined as a highest available carrier wave of priority.
Need to prove that present embodiment is not limited to the mode of above-mentioned definite carrier wave priority, anyly can determine that the mode of carrier wave priority all is suitable for present embodiment by the parameter information of available carrier wave.
In specific implementation process, a plurality of if the highest available carrier wave of priority has, then first carrier determination module 210 from a plurality of available carrier wave of determining, selects an available carrier wave as a highest available carrier wave of priority according to preset rule.
Preset rule includes but not limited to a kind of in the following rule:
Therefrom select an available carrier wave as a highest available carrier wave of priority at random; Redefine the highest available carrier wave of priority according to other modes again; In the identical and the highest available carrier wave scope of priority, determine the available carrier wave that priority is the highest according to other modes again.
After comparing according to load, the available carrier wave that priority is the highest has a plurality of, then can compare again according to random access resource again, or in the identical and the highest available carrier wave scope of priority, compare again according to random access resource.
First access module 220 at random is used for inserting at random by the highest available carrier wave of priority that first carrier determination module 210 is determined.
If first at random the highest available carrier wave of priority determined by first carrier determination module 210 of access module 220 carry out access failure at random, need insert at random again, then first carrier determination module 210 is determined an available carrier wave that is used for inserting again in other available carrier wave first when access module 220 is carried out at random access failure by the highest available carrier wave of determining of priority at random.
First at random access module 220 insert at random by an available carrier wave that is used for inserting again of determining.
In specific implementation process, if first at random the highest available carrier wave of priority determined by first carrier determination module 210 of access module 220 carry out access failure at random, need insert at random, then the available carrier wave that first carrier determination module 210 also can be high with priority second is as an available carrier wave that inserts again again; Also can determine again that again the another one available carrier wave is as an available carrier wave that inserts again according to the mode of determining carrier wave priority.
If first at random access module 220 insert failure once more at random by an available carrier wave that is used for inserting again of determining, then first carrier determination module 210 redefines an available carrier wave (determining an available carrier wave in the never used available carrier wave) again, up to inserting at random successfully, perhaps the access of being undertaken by all available carrier wave is at random all failed, then first at random access module 220 determine access failures at random.
In order to improve the flexibility of system, terminal can determine whether to adopt priority mode to insert at random according to the indication of base station, and then the terminal of present embodiment can further include: first trigger module 230.
First trigger module 230 is used for receiving from after being used for indicating terminal and adopting the indication information that priority mode inserts at random of base station, triggers first carrier determination module 210 parameter information of each available carrier wave is compared.
If terminal is received the indication information that mode that indicating terminal adopts prior art inserts at random that is used for from the base station, then terminal determines that according to the mode of prior art a carrier wave inserts at random.
As shown in Figure 4, first kind of accidental access method of the embodiment of the invention comprises the following steps:
Step 400, terminal are determined the parameter information of each available carrier wave in the system.
Wherein, the parameter information of available carrier wave includes but not limited to one or more in the following parameters information:
The load of the PRACH resource of the frequency of numerical priority value, carrier wave, the bandwidth of carrier wave, carrier wave, the Preamble sign indicating number of carrier wave, carrier wave, other carrier wave insert relevant parameter (for example, the maximum transmit power of Preamble sign indicating number, Msg3 HARQ maximum retransmission etc.) at random.
If parameter information is a numerical priority value, be 0~8 such as priority limit, the base station can be made as 1 with the priority of carrier wave 1 so, and the priority of carrier wave 2 is made as 2, sends it to terminal by broadcast then; Preferable, the base station can be adjusted the priority of different carrier dynamically, reaches the balanced purpose that inserts at random.
In specific implementation process, terminal is determined the parameter information of each available carrier wave in the system from the broadcast that the base station sends; Or
Message is obtained in transmission to the base station, and from the parameter information from definite each available carrier wave the feedback message of base station.
Need to prove that present embodiment is not limited to above-mentioned two kinds of modes of obtaining the parameter information of available carrier wave, any mode that can obtain the parameter information of available carrier wave all is suitable for present embodiment.
Step 401, terminal compare the parameter information of each available carrier wave, and determine the available carrier wave that priority is the highest according to comparative result.
Wherein, terminal can be passed through a kind of definite available carrier wave in the following manner:
The random access resource of each available carrier wave is compared (such as carrier bandwidths, available random access resource etc.), the available carrier wave that random access resource is maximum is defined as a highest available carrier wave of priority; Or
The load of each available carrier wave is compared, a minimum available carrier wave of load is defined as a highest available carrier wave of priority; Or
The attribute information of each available carrier wave is compared, attribute information is satisfied an available carrier wave that imposes a condition be defined as a highest available carrier wave of priority; Or
The available carrier wave that the numerical priority value of available carrier wave is the highest is defined as a highest available carrier wave of priority.
If attribute information is a frequency, the available carrier wave that terminal is high or minimum with frequency is defined as a highest available carrier wave of priority, and just that centre frequency is a high or minimum available carrier wave is defined as a highest available carrier wave of priority.
Need to prove that present embodiment is not limited to the mode of above-mentioned definite carrier wave priority, anyly can determine that the mode of carrier wave priority all is suitable for present embodiment by the parameter information of available carrier wave.
In specific implementation process, can also be with numerical priority value, the load of the PRACH resource of the frequency of carrier wave, the bandwidth of carrier wave, carrier wave, the Preamble sign indicating number of carrier wave, carrier wave, other carrier wave insert informix such as relevant parameter at random to be considered, and then definite priority.For example, the PRACH resource of the bandwidth of terminal known carrier wave and carrier wave, carry out priority ratio than the time, terminal will be given different weighted values to these two kinds of information, after the two quantification, multiply by weighted value more respectively, be the numerical priority value of this carrier wave after the gained results added.
In specific implementation process, a plurality of if the highest available carrier wave of priority has, then terminal from a plurality of available carrier wave of determining, selects an available carrier wave as a highest available carrier wave of priority according to preset rule.
Preset rule includes but not limited to a kind of in the following rule:
Therefrom select an available carrier wave as a highest available carrier wave of priority at random; Redefine the highest available carrier wave of priority according to other modes again; In the identical and the highest available carrier wave scope of priority, determine the available carrier wave that priority is the highest according to other modes again.
After comparing according to load, the available carrier wave that priority is the highest has a plurality of, then can compare again according to random access resource again, or in the identical and the highest available carrier wave scope of priority, compare again according to random access resource.
Step 402, terminal insert at random by the highest available carrier wave of determining of priority.
If terminal is carried out access failure at random by the highest available carrier wave of determining of priority, need insert at random again, then can further include after the step 402:
Step 403, terminal are determined an available carrier wave that is used for inserting again in other available carrier wave when carrying out at random access failure by the highest available carrier wave of determining of priority.
Step 404, terminal insert at random by an available carrier wave that is used for inserting again of determining.
In the step 403, if terminal is being carried out access failure at random by the highest available carrier wave of determining of priority, the available carrier wave that terminal also can be high with priority second is as an available carrier wave of access again; Also can determine again that again the another one available carrier wave is as an available carrier wave that inserts again according to the mode of determining carrier wave priority.
If terminal inserts failure once more at random by an available carrier wave that is used for inserting again of determining, then terminal redefines an available carrier wave (determining an available carrier wave in the never used available carrier wave) again, up to inserting at random successfully, perhaps the access of being undertaken by all available carrier wave is at random all failed, and then terminal is determined access failure at random.
In order to improve the flexibility of system, terminal can determine whether to adopt priority mode to insert at random according to the indication of base station, concrete,
The base station determines according to predefined network strategy which kind of access way at random is terminal adopt, and then sends indication information.
Such as, require terminal to adopt priority mode, then the indication information of Fa Songing is to be used for the indication information (such as sending 0) that indicating terminal adopts priority mode to insert at random, terminal just knows that after receiving 0 the employing priority mode inserts at random;
Require terminal to adopt the mode of prior art, then the indication information of Fa Songing is to be used for the indication information (such as sending 1) that mode that indicating terminal adopts prior art inserts at random, and terminal adopts the mode of prior art to insert at random with regard to knowing receiving after 1.
Need to prove that present embodiment is not limited to 0 and 1 indicating mode, the mode that other can indicating terminal all is suitable for present embodiment.
Then can further include before the step 401:
Terminal determines to receive the indication information that indicating terminal adopts priority mode to insert at random that is used for from the base station
If terminal is received the indication information that mode that indicating terminal adopts prior art inserts at random that is used for from the base station, then terminal determines that according to the mode of prior art a carrier wave inserts at random.
As shown in Figure 5, second kind of random access system of the embodiment of the invention comprises: base station 50 and terminal 60.
Terminal 60 is used for determining the available carrier wave of system, selects an available carrier wave at random from the available carrier wave of determining, inserts at random by the available carrier wave of selecting.
Wherein, terminal 60 can be selected an available carrier wave at random according to random probability distribution (such as evenly distributing or other distribution of probability) from the available carrier wave of determining; Or
The parameter information of each available carrier wave of determining is compared, determine the access probability at random of each available carrier wave, and select at random according to the access probability of determining at random according to comparative result.
Wherein, the parameter information of available carrier wave includes but not limited to one or more in the following parameters information:
The load of the PRACH resource of the frequency of numerical priority value, carrier wave, the bandwidth of carrier wave, carrier wave, the Preamble sign indicating number of carrier wave, carrier wave, other carrier wave insert relevant parameter (for example, the maximum transmit power of Preamble sign indicating number, Msg3 HARQ maximum retransmission etc.) at random.
Parameter information such as available carrier wave is a bandwidth, and the bandwidth of two carrier waves is respectively 10MHz and 20MHz, and then the access probability at random of these two carrier waves is respectively 1/3 and 2/3.
In specific implementation process, base station 50 sends the broadcast of the parameter information that comprises each available carrier wave;
Then terminal 60 is determined the parameter information of each available carrier wave in the system from the broadcast of receiving.Perhaps
Terminal 60 sends to base station 50 and obtains message; Base station 50 receive obtain message after, send the feedback message of the parameter information that comprises each available carrier wave to terminal 60; Terminal 60 is determined the parameter information of each available carrier wave from the feedback message of receiving.
Need to prove that present embodiment is not limited to above-mentioned two kinds of modes of obtaining the parameter information of available carrier wave, any mode that can make terminal 60 obtain the parameter information of available carrier wave all is suitable for present embodiment.
In order to improve the flexibility of system, the base station 50 of present embodiment can also indicate terminal 60 to insert at random according to random fashion or according to the prior art mode.Concrete,
Base station 50 is determined which kind of access way at random is terminal 60 adopt, and then is sent indication information according to predefined network strategy.
Such as, require terminal 60 to adopt random fashion, then the indication information of Fa Songing is to be used for the indication information (such as sending 0) that indicating terminal adopts priority mode to insert at random, terminal 60 just knows that after receiving 0 the employing random fashion inserts at random;
Require terminal 60 to adopt the mode of prior art, then the indication information of Fa Songing is to be used for the indication information (such as sending 1) that mode that indicating terminal adopts prior art inserts at random, and terminal 60 adopts the mode of prior art to insert at random with regard to knowing receiving after 1.
Need to prove that present embodiment is not limited to 0 and 1 indicating mode, the mode that other can indicating terminal all is suitable for present embodiment.
As shown in Figure 6, second kind of terminal of the embodiment of the invention comprises: the second carrier wave determination module 600, selection module 610 and second be access module 620 at random.
The second carrier wave determination module 600 is used for determining the available carrier wave of system.
Wherein, the second carrier wave determination module 600 is determined the available carrier wave in the system according to the frequency of available carrier wave in the system.Concrete, the second carrier wave determination module 600 can obtain the frequency of available carrier wave from network side (such as the base station); Also can be by the frequency of self measuring available carrier wave in the acquisition system.
Need to prove that present embodiment is not limited to above-mentioned two kinds of modes that obtain the frequency of available carrier wave, any mode that can obtain the frequency of available carrier wave all is suitable for present embodiment.
Select module 610, be used for from second at random the available carrier wave determined of access module 620 select an available carrier wave at random.
Wherein, select module 610 from the available carrier wave of determining, to select an available carrier wave at random according to random probability distribution (such as evenly distributing or other distribution of probability); Or
The parameter information of each available carrier wave of determining is compared, determine the access probability at random of each available carrier wave, and select at random according to the access probability of determining at random according to comparative result.
Wherein, the parameter information of available carrier wave includes but not limited to one or more in the following parameters information:
The load of the PRACH resource of the frequency of numerical priority value, carrier wave, the bandwidth of carrier wave, carrier wave, the Preamble sign indicating number of carrier wave, carrier wave, other carrier wave insert relevant parameter (for example, the maximum transmit power of Preamble sign indicating number, Msg3 HARQ maximum retransmission etc.) at random.
Parameter information such as available carrier wave is a bandwidth, and the bandwidth of two carrier waves is respectively 10MHz and 20MHz, and then the access probability at random of these two carrier waves is respectively 1/3 and 2/3.
Second access module 620 at random is used for inserting at random by the available carrier wave of selecting module 610 to select.
If second at random access module 620 carry out access failure at random by the available carrier wave of selecting module 610 to select, need insert at random again, then select module 610 second when access module 620 is carried out at random access failure by the available carrier wave of determining at random, select an available carrier wave that is used for inserting again in other available carrier wave.
Second at random access module 620 insert at random by an available carrier wave that is used for inserting again of selecting module 610 to select.
In specific implementation process, if second at random access module 620 carry out access failure at random by the available carrier wave of selecting module 610 to select, need insert at random again, select module 610 also can determine the mode of the limit priority of available carrier wave, select the highest available carrier wave of priority as an available carrier wave that inserts again according to first carrier determination module among Fig. 3 210; Can also be again select an available carrier wave being used for inserting again again at random.Select module 610 to determine that by priority the mode of available carrier wave and first carrier determination module 210 determine that by priority the mode of available carrier wave is similar, repeat no more.
If second at random access module 620 insert failure once more at random by an available carrier wave that is used for inserting again of determining, then select module 610 to reselect an available carrier wave (selecting an available carrier wave in the never used available carrier wave) again, up to inserting at random successfully, perhaps the access of being undertaken by all available carrier wave is at random all failed, then second at random access module 620 determine access failures at random.
In order to improve the flexibility of system, terminal can determine whether to adopt random fashion to insert at random according to the indication of base station, and then the terminal of present embodiment can further include: second trigger module 630.
Second trigger module 630 is used for receiving that triggering selection module 610 is selected an available carrier wave from after being used for indicating terminal and adopting the indication information that random fashion inserts at random of base station.
If terminal is received the indication information that mode that indicating terminal adopts prior art inserts at random that is used for from the base station, then terminal determines that according to the mode of prior art a carrier wave inserts at random.
As shown in Figure 7, second kind of accidental access method of the embodiment of the invention comprises the following steps:
Step 700, terminal are determined the available carrier wave in the system.
Wherein, terminal is determined the available carrier wave in the system according to the frequency of available carrier wave in the system.Concrete, terminal can be obtained the frequency of available carrier wave from network side (such as the base station); Also can be by the frequency of self measuring available carrier wave in the acquisition system.
Need to prove that present embodiment is not limited to above-mentioned two kinds of modes that obtain the frequency of available carrier wave, any mode that can obtain the frequency of available carrier wave all is suitable for present embodiment.
Step 701, terminal are selected an available carrier wave at random from the available carrier wave of determining.
Wherein, terminal can be selected an available carrier wave at random according to random probability distribution (such as evenly distributing or other distribution of probability) from the available carrier wave of determining; Or
The parameter information of each available carrier wave of determining is compared, determine the access probability at random of each available carrier wave, and select at random according to the access probability of determining at random according to comparative result.
Wherein, the parameter information of available carrier wave includes but not limited to one or more in the following parameters information:
The load of the PRACH resource of the frequency of numerical priority value, carrier wave, the bandwidth of carrier wave, carrier wave, the Preamble sign indicating number of carrier wave, carrier wave, other carrier wave insert relevant parameter (for example, the maximum transmit power of Preamble sign indicating number, Msg3 HARQ maximum retransmission etc.) at random.
Parameter information such as available carrier wave is a bandwidth, and the bandwidth of two carrier waves is respectively 10MHz and 20MHz, and then the access probability at random of these two carrier waves is respectively 1/3 and 2/3.
Step 702, terminal insert at random by the available carrier wave of selecting.
If the available carrier wave that terminal is selected is carried out access failure at random, need insert at random again, then can further include after the step 702:
When step 703, terminal are carried out at random access failure by the available carrier wave of determining, select an available carrier wave that is used for inserting again in other available carrier wave.
Step 704, terminal insert at random by an available carrier wave that is used for inserting again of selecting.
In the step 703, if terminal is carried out access failure at random by the available carrier wave of determining, terminal also can select the highest available carrier wave of priority as an available carrier wave that inserts again according to the mode of determining the limit priority of available carrier wave in Fig. 4 step 401; Can also be again select an available carrier wave being used for inserting again again at random.The terminal of present embodiment is determined to determine that by priority the mode of available carrier wave is similar in the mode of available carrier wave and Fig. 4 step 401 by priority, is repeated no more.
If terminal inserts failure once more at random by an available carrier wave that is used for inserting again of determining, then terminal is reselected an available carrier wave (selecting an available carrier wave in the never used available carrier wave) again, up to inserting at random successfully, perhaps the access of being undertaken by all available carrier wave is at random all failed, and then terminal is determined access failure at random.
In order to improve the flexibility of system, terminal can determine whether to adopt random fashion to insert at random according to the indication of base station.Concrete,
The base station determines according to predefined network strategy which kind of access way at random is terminal adopt, and then sends indication information.
Such as, require terminal to adopt random fashion, then the indication information of Fa Songing is to be used for the indication information (such as sending 0) that indicating terminal adopts random fashion to insert at random, terminal just knows that after receiving 0 the employing random fashion inserts at random;
Require terminal to adopt the mode of prior art, then the indication information of Fa Songing is to be used for the indication information (such as sending 1) that mode that indicating terminal adopts prior art inserts at random, and terminal adopts the mode of prior art to insert at random with regard to knowing receiving after 1.
Need to prove that present embodiment is not limited to 0 and 1 indicating mode, the mode that other can indicating terminal all is suitable for present embodiment.
Then can further include before the step 701:
Terminal determines to receive the indication information that indicating terminal adopts random fashion to insert at random that is used for from the base station.
If terminal is received the indication information that mode that indicating terminal adopts prior art inserts at random that is used for from the base station, then terminal determines that according to the mode of prior art a carrier wave inserts at random.
From the foregoing description as can be seen: a kind of mode of the embodiment of the invention is the parameter information that terminal is determined each available carrier wave in the system; Described terminal compares the parameter information of each available carrier wave, and determines the available carrier wave that priority is the highest according to comparative result; Described terminal inserts at random by the highest available carrier wave of determining of priority.The another kind of mode of inventive embodiments is that terminal is determined the available carrier wave in the system; Described terminal is selected an available carrier wave at random from the described available carrier wave of determining; Described terminal inserts at random by the available carrier wave of selecting.Because terminal can insert at random by the available carrier wave of self selecting, thereby reduce the collision probability that inserts at random, improve the probability of success that inserts at random, but also can reduce the time delay of random access procedure, the load of access at random between balanced each carrier wave, and then improve systematic function.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.