CN101442809B - Random access method and system for wireless access network of multiple subsystems - Google Patents
Random access method and system for wireless access network of multiple subsystems Download PDFInfo
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Abstract
The invention discloses a random access method and random access system for wireless access network of multi-sub system. The method comprises: presetting a basic sub system from multi-sub system in wireless access network, and presetting selection standard of target sub system; attaching the idle terminal to basic sub system; when idle terminal needs to enter into random access, comprising: A determining related parameter with selection standard with target sub system, determining target sub system according to determined parameter and selected standard; B randomly accessing to the target subsystem. The random access system comprises: preset parameter module, attachment module and random access module. In the invention, terminal can selectively randomly accesses to a sub system of wireless access network possessing multi-sub system without adding to random access cost of single system, thereby shortening access time delay.
Description
Technical field
The present invention relates to the accessing terminal to network technology in the communication system, relate in particular to a kind of accidental access method of wireless access network of multiple subsystem and the random access system that can in this wireless access network, access terminal at random.
Background technology
In the prior art, be in the terminal (UE) of standby (IDLE) state, if wish to communicate service, must be earlier by being connected of random access procedure foundation and Radio Access Network, could communicate with network afterwards.The realization of random access procedure is that UE selects the Preamble sign indicating number at random in specific Preamble sequence sets closes, and realizes to network transmission Preamble by preallocated random access resource.After network received Preamble, through follow-up signalling interactive process, foundation was connected with UE's, could provide follow-up communication service for UE afterwards.When two UE select same Preamble sign indicating number and send on identical random access resource, will clash, after the UE of conflict will postpone certain hour, carry out random access procedure again.
Present new generation of wireless mobile communication requires to realize that simultaneously super large bandwidth high-data-rate wireless access technology and broadband extensively cover the high speed mobile transmission technology.Super large bandwidth high-data-rate wireless access technology is used for satisfying the demand to ultra high data rate (for example more than the highest 1Gb/s) and power system capacity, needs to use very big system bandwidth (maximum to 100MHz), mainly utilizes high frequency to bring realization.The broadband extensively covers the high speed mobile transmission technology then need realize system performance guarantee under seamless continuous covering and the high-speed mobile at relatively low frequency band.Like this, may adopt two even a plurality of discontinuous frequency band in the Radio Access Network simultaneously, each frequency band all is a relatively independent subsystem, can finish various wireless communication procedures separately.Simultaneously, also can coordinated manipulation between a plurality of frequency bands, parameter is shared.
For example, Fig. 1 is the schematic diagram based on the Radio Access Network framework of double-deck subsystem that present IMT-Advanced system proposes.As shown in Figure 1, this Radio Access Network is made of low-frequency band subsystem and high frequency band subsystem.The low-frequency band subsystem work is at lower band (as the following IMT-2000 frequency band of 3GHz), and being applicable to provides wide area to cover and high mobility, is called low-frequency band business (LBO, Low BandOperation) system 101.The high frequency band subsystem work provides focus to cover and Hypomobility at high frequency band (as the new frequency band of 3GHz～5GHz), is called high frequency band business (UBO, Upper BandOperation) system 102.
The access technology at random of existing wireless access network network is based on all that individual system carries out, also not have at present open how in the multiple subsystem wireless access network selection initiate the technical scheme of access subsystem at random.The multiple subsystem Radio Access Network has proposed new requirement to random access procedure.If the subsystem of selecting initiation to insert at random process improper or that initiation inserts at random is too loaded down with trivial details, can increase access delay and system loading at random.
At present unique similar to the multiple subsystem Radio Access Network be the N frequency point network, in the N frequency point network, there are a plurality of working frequency points, but these frequencies are very near at interval, the characteristic of channel of each frequency is similar, all terminals are all initiated to insert at random at dominant frequency point, by network side terminal scheduling is worked to other frequencies, auxilliary frequency is not an independent system again, the independent scheduling of more impossible each frequency of realization.
If continue to use the random access scheme of N frequency, all terminals all insert on a subsystem, and following shortcoming is then arranged:
(1) the access burden of the single subsystem of increase;
(2) when terminal need be operated on other subsystems, need carry out switching between subsystem, the characteristic of channel of each subsystem is different, and switching between subsystem is the process of a more complicated, this can increase terminal from idle condition to the time delay that enters normal operating conditions.
Summary of the invention
In view of this, technical problem to be solved by this invention is to provide a kind of accidental access method of wireless access network of multiple subsystem, can realize that terminal inserts one of them subsystem selectively at random, not increase the access expense at random of individual system, shorten access delay at random.
Another technical problem to be solved by this invention is to provide a kind of random access system, can realize inserting at random selectively a subsystem of multiple subsystem wireless access network, does not increase the access expense at random of individual system, shortens access delay at random.
In order to realize the foregoing invention purpose, main technical schemes of the present invention is:
A kind of accidental access method of wireless access network of multiple subsystem, this method be default basic subsystem from the multiple subsystem of described Radio Access Network, and the choice criteria of goal-selling subsystem; With the terminal of idle condition attached on the basic subsystem;
When the terminal of idle condition need insert at random, comprising:
A, definite parameter relevant with the choice criteria of described target sub system according to determined parameter and described choice criteria, are determined target sub system;
B, on described target sub system, insert at random.
Preferably, the choice criteria of described target sub system is the function based on terminal velocity, traffic carrying capacity and subsystem channel quality, the concrete value of described default choice criteria is the threshold value up and down according to the determined described function of simulation result, the scene of higher limit respective channels environmental requirement strictness wherein, the loose scene of lower limit respective channels environmental requirement; The described parameter relevant with choice criteria is terminal velocity, traffic carrying capacity, subsystem channel quality.
Preferably, steps A specifically comprises:
A1, terminal are estimated self speed, measure the channel quality of basic subsystem, and definite traffic carrying capacity;
A2, the parameter that obtains according to steps A 1 are determined described functional value;
A3, more described functional value and default choice criteria are if described functional value less than the lower limit of choice criteria, is then selected to the minimum subsystem of channel quality requirement as target sub system execution in step B; If described functional value greater than the higher limit of choice criteria, is then selected the highest subsystem of channel quality requirement as target sub system, execution in step B; If described functional value is at up and down between the threshold value of described choice criteria, then execution in step A4;
A4, measure the channel quality of other subsystem except that basic subsystem in the described wireless access network, according to measurement result, the best subsystem of channel quality is as target sub system in the selection wireless access network.
Preferably, the terminal under the described idle condition receives only the broadcast on the described basic subsystem, and comprises the random access parameter information of other subsystem of described wireless access network in the broadcast on the described basic subsystem; Among the step B, terminal utilizes the random access parameter information of the target sub system in the basic subsystem broadcast to finish random access procedure.
Preferably, described basic subsystem is to realize the subsystem of the seamless covering of wide area in the described wireless access network.
Preferably, described method further comprises by prior information definite preferred subsystem that is applicable to this terminal from described wireless access network; The choice criteria of described default target sub system is the channel quality value that most probable satisfies described terminal needs; And described steps A specifically comprises:
The channel quality of a1, the described preferred subsystem of measurement;
Whether the channel quality that a2, determining step a1 obtain satisfies the channel quality value of default described terminal needs, if, then with described preferred subsystem as target sub system, execution in step B; Otherwise, execution in step a3;
A3, measure the channel quality of other subsystem except that described preferred subsystem in the described wireless access network, according to measurement result, the best subsystem of channel quality is as target sub system in the selection wireless access network.
Preferably, among the described step B, terminal obtains the random access parameter information of target sub system by the broadcast that reads target sub system, and utilizes this random access parameter information to finish random access procedure.
Preferably, when described terminal had a plurality of receiver at different sub-systems, the concrete grammar of the channel quality of other subsystem was in the described wireless access network of described measurement: utilize each receiver to measure the channel quality of corresponding subsystem simultaneously;
When described terminal has a receiver, the concrete grammar of the channel quality of other subsystem is in the described wireless access network of then described measurement: adopt time division way to measure the channel quality of described each subsystem respectively.
A kind of random access system of wireless access network of multiple subsystem comprises:
Preset parameter module, wherein default basic subsystem, and the choice criteria of goal-selling subsystem;
Attachable module, be used to impel wireless communication terminal when idle condition attached to described basic subsystem;
Access module is used for determining the parameter relevant with the choice criteria of described target sub system when inserting at random at random, according to determined parameter and described choice criteria, determines target sub system, and inserts at random on described target sub system.
Preferably, the choice criteria of described target sub system is the function based on terminal velocity, traffic carrying capacity and subsystem channel quality, described default choice criteria is the threshold value up and down according to the determined described function of simulation result, the scene of higher limit respective channels environmental requirement strictness wherein, the loose scene of lower limit respective channels environmental requirement; The described parameter relevant with choice criteria is terminal velocity, traffic carrying capacity, subsystem channel quality.
Preferably, described access module at random specifically comprises:
The parameter determining unit is used to estimate terminal self speed, measures the channel quality of basic subsystem, and definite traffic carrying capacity;
The function calculation unit is used for the described functional value of calculation of parameter that obtains according to the parameter determining unit;
Comparing unit, be used for more described functional value and default choice criteria, if described functional value less than or smaller or equal to the lower limit of choice criteria, then select the minimum subsystem of channel quality requirement as target sub system, triggering at random, access unit inserts on described target sub system at random; If described functional value greater than or more than or equal to the higher limit of choice criteria, then select the highest subsystem of channel quality requirement as target sub system, triggering at random, access unit inserts on described target sub system at random; If described functional value then triggers channel quality measurement unit in up and down between the threshold value of described choice criteria;
Channel quality measurement unit, be used for measuring the channel quality of other subsystem of described wireless access network except that basic subsystem, according to measurement result, select the best subsystem of channel quality in the wireless access network as target sub system, triggering at random, access unit inserts on described target sub system at random;
Access unit is used for inserting at random on described target sub system at random.
Preferably, described preset parameter module further is provided with a preferred subsystem information that is applicable to this terminal; The choice criteria of described default target sub system is the channel quality value that described terminal needs; And described access module at random specifically comprises:
First channel quality measurement unit is used to measure the channel quality of described preferred subsystem;
Judging unit, be used to judge whether channel quality that first channel quality measurement unit obtains satisfies the channel quality value of default described terminal needs, if, then with described preferred subsystem as target sub system, triggering at random, access unit inserts on described target sub system at random; Otherwise, trigger the second channel quality measurement unit;
The second channel quality measurement unit, be used for measuring the channel quality of other subsystem of described wireless access network except that described preferred subsystem, according to measurement result, select the best subsystem of channel quality in the wireless access network as target sub system, triggering at random, access unit inserts on described target sub system at random;
Access unit is used for inserting at random on described target sub system at random.
Since the present invention with the terminal of idle condition attached on the default basic subsystem, when terminal when needs insert at random, determine the parameter relevant with default choice criteria, select to determine that according to described choice criteria a most probable carries out the subsystem initiation access at random of normal course of communications, after finishing, random access procedure just can on this subsystem, receive and send messages, do not switch between unnecessary system and do not need to introduce, all on a subsystem, initiate the scheme of access at random with respect to all terminals, the present invention can not increase the access expense at random of single subsystem, increase the reliability that inserts at random, shortened the time delay that inserts at random.
In addition, the present invention can be with the random access information of a plurality of subsystems of wireless access network broadcast transmission on described basic subsystem, therefore can in the broadcasting of basic subsystem, directly read the random access information of target sub system attached to the terminal on the basic subsystem, and directly initiate access at random to target sub system, therefore can further shorten the time delay that inserts at random, optimize random access scheme.
Description of drawings
Fig. 1 is the schematic diagram based on the Radio Access Network framework of double-deck subsystem that present IMT-Advanced system proposes;
Fig. 2 is the flow chart of first kind of embodiment of the present invention;
Fig. 3 is the flow chart of second kind of embodiment of the present invention;
Fig. 4 is a random access system structural representation of the present invention.
Embodiment
Below by specific embodiments and the drawings the present invention is described in further details.
What the present invention discussed is the wireless access network how wireless communication terminal (can abbreviate terminal as herein) inserts to high efficient and reliable a plurality of subsystems at random.Described wireless access network has a plurality of discontinuous frequency bands and/or multiple wireless access technology, and each frequency band and every kind of wireless access technology all are independent subsystem.Core concept of the present invention is: the terminal under the idle condition is when needs initiate to insert at random, the system of selecting most probable to carry out normal course of communications initiates to insert at random as goal systems, terminal can directly be received and sent messages in this system after random access procedure was finished, and did not switch and need not introduce between unnecessary system.The foundation of terminal select target system is parameters such as the channel quality (CQI), offered load of terminal velocity, traffic performance and each wireless system.
Based on above-mentioned core concept, the main technical schemes that the present invention adopts is: default basic subsystem from the Radio Access Network that contains a plurality of subsystems, and the choice criteria of goal-selling subsystem; With the terminal of idle condition attached on the basic subsystem; When the terminal of idle condition need insert at random, determine the parameter relevant with the choice criteria of described target sub system, according to determined parameter and described choice criteria, determine target sub system; On described target sub system, insert at random.
Above-mentioned basic subsystem is fixed, and terminal is on idle condition need be attached to this basic subsystem.Basic subsystem is generally the subsystem of realizing the seamless covering of wide area in the described wireless access network, and for example the LBO in the wireless access network of Fig. 1 can be used as basic subsystem.In addition, the present invention can also be provided with initial subsystem, and this initial subsystem can be described fixing basic subsystem, also can be the preferred subsystem by terminal or base station appointment.According to the difference of initial subsystem, the present invention has different access at random to realize embodiment, below introduces respectively.
First kind of embodiment: in the present embodiment, described initial subsystem is exactly set basic subsystem, and comprises following three characteristics:
1) terminal under the idle condition is all attached on the described basic subsystem.Described adhering to only is meant and preserves this UE information by basic subsystem, initiates paging to UE by this basic subsystem, and UE only reads the broadcast message of this basic subsystem under the IDLE state.
2) choice criteria of described target sub system is set to the function a based on terminal velocity, traffic carrying capacity and subsystem channel quality, and the described parameter relevant with choice criteria is terminal velocity, traffic carrying capacity, subsystem channel quality.The concrete value of described default choice criteria is a of threshold value up and down according to the determined described function of simulation result
1And a
2, a
1＞a
2Described up and down threshold value is used to select the subsystem of initiating to insert at random, wherein a
1To the scene of strict, the low speed of reply channel circumstance, the high service rate of support, a
2The respective channels environmental requirement is loose, at a high speed, can not support the scene of high service rate.Describedly under different performances, can have any different, need specifically determine according to different concrete conditions to the strict or loose standard of channel circumstance.
3) comprise the random access parameter information of other subsystem in the described wireless access network in the broadcast message of described basic subsystem, described random access parameter information for example can be information such as Random Access Channel position and access code.
Fig. 2 is the flow chart of first kind of embodiment of the present invention.Referring to Fig. 2, this flow process comprises:
Step 201～202: terminal is estimated self speed when needs initiate to insert at random, described speed estimation method can adopt prior art, repeats no more herein; If speed surpasses the predetermined acceptance value, then a is set to less than a
2Number, enter step 205; Described predetermined acceptance value can determine according to the receptible speed of different sub-systems, and the terminal that speed surpasses this acceptance value can only be operated in channel quality is required in minimum (promptly the most conservative) system.If described speed does not surpass the predetermined acceptance value, then terminal is provided with V parameter according to the self speed grade, and low more V is high more for speed, enters step 203.
Step 203: terminal is measured the channel quality on the described basic subsystem, according to channel quality value parameters C is set, and good more C is high more for channel quality.
Step 204: according to terminating traffic parameter L is set, high more L is big more for traffic carrying capacity, and then by formula (1) calculates the selection parameter a of goal systems:
a＝f(C，L，V) (1)
Formula (1) can have multiple expression way, and a basic expression way is:
a＝α
1C+α
2L+α
3V+Δ (2)
Wherein, factor alpha
1, α
2, α
3Expression parameters C, the shared proportion of L, V, Δ is a correction value, the concrete value of these values is determined by the realization situation in the concrete connecting system.
Step 205～206: compare a and threshold value a
1, a
2, following three kinds of situations may appear:
If a＜a
2, then select the minimum subsystem of channel quality requirement as target sub system, and initiate to insert at random in this goal systems.General, described basic subsystem is to the minimum subsystem of channel quality requirement, so in such cases, target sub system generally is exactly a basic subsystem in the described wireless access network.Described to channel quality requirement minimum subsystem and the strictest subsystem of channel quality requirement can be pre-determined and be stored on the terminal by terminal and internetwork negotiations process described in the third situation, perhaps when starting up of terminal, notify terminal by network side.Described negotiations process can repeat no more with reference to prior art herein.
If a
1＞a＞a
2, starting the measurement of the channel quality of other subsystem except that basic subsystem in the wireless access network, the top-quality system of selective channel initiates to insert at random as target sub system.
In the process of the channel quality of measuring a plurality of subsystems,, therefore can adopt different metering systems according to the quantity of terminal receiver owing to have bigger otherness between each subsystem.When described terminal had a plurality of receiver at different sub-systems, described method of measurement was specially: utilize each receiver to measure the channel quality of corresponding subsystem simultaneously; When described terminal has a receiver, then described method of measurement is specially: adopt time division way to measure the channel quality of described each subsystem respectively.
If a＞a
1, then select to support high service rate, require the strictest subsystem to initiate to insert at random (not being basic subsystem probably) as goal systems to channel condition.
In first kind of embodiment, when terminal inserts target sub system at random, can directly utilize the information of on-position and access code etc. at random of other subsystem in the described fundamental system broadcast message, therefrom obtain the random access parameter information of target sub system, and utilize this random access parameter information to finish random access procedure.
Second kind of embodiment: in the present embodiment, except a default basic subsystem from the multiple subsystem of described Radio Access Network, also further from described wireless access network, determine a preferred subsystem that is applicable to this terminal by prior information; The choice criteria of described default target sub system is the channel quality value that most probable satisfies described terminal needs.Herein " most probable satisfies " determines that according to prior information the situation of " most probable satisfies " is different in the different application scenarioss.Terminal under the described idle condition is all attached on the described basic subsystem, but in the present embodiment, can not require the random access information that comprises other subsystem in the broadcast message of basic subsystem, terminal obtains corresponding random access information by the broadcast message that reads target sub system when inserting at random.
Fig. 3 is the flow chart of second kind of embodiment of the present invention.Referring to Fig. 2, this flow process comprises:
Step 301: terminal is measured the channel quality of optimum decision system.
Step 302: judge whether the channel quality of described preferred subsystem satisfies the channel quality value of default described terminal needs, if then execution in step 303; Otherwise, execution in step 305.
Step 303～304: described preferred subsystem as target sub system, is read the random access information that this target sub system is obtained in target sub system broadcasting, according to the access at random of this random access information initiation to target sub system.
Step 305～306: the channel quality of measuring other subsystem except that described preferred subsystem in the described wireless access network, according to measurement result, select the best subsystem of channel quality in the wireless access network as target sub system, read the random access information that this target sub system is obtained in target sub system broadcasting, according to the at random access of this random access information initiation to target sub system.
In the process of the channel quality of measuring a plurality of subsystems,, therefore can adopt different metering systems according to the quantity of terminal receiver owing to have bigger otherness between each subsystem.When described terminal had a plurality of receiver at different sub-systems, described method of measurement was specially: utilize each receiver to measure the channel quality of corresponding subsystem simultaneously; When described terminal has a receiver, then described method of measurement is specially: adopt time division way to measure the channel quality of described each subsystem respectively.
Based on said method, the invention also discloses a kind of random access system of wireless access network of the multiple subsystem that can realize said method.Fig. 4 is the structural representation of this random access system.Referring to Fig. 4, this random access system 400 comprises:
Preset parameter module 401 is arranged on terminal, also can be arranged on network side simultaneously, default basic subsystem in this preset parameter module, and the choice criteria of goal-selling subsystem.
Corresponding with two kinds of embodiment of said method, this random access system also has two kinds of embodiment.In first kind of embodiment, the choice criteria of described target sub system is the function a based on terminal velocity, traffic carrying capacity and subsystem channel quality, described default choice criteria is the threshold value up and down according to the determined described function of simulation result, promptly described a
1And a
2, higher limit a wherein
1The scene of respective channels environmental requirement strictness, lower limit a
2The loose scene of respective channels environmental requirement; The described parameter relevant with choice criteria is terminal velocity, traffic carrying capacity, subsystem channel quality.
In first kind of embodiment of random access system, described access module at random 403 specifically comprises:
The parameter determining unit is used to estimate terminal self speed, measures the channel quality of basic subsystem, and definite traffic carrying capacity.
The function calculation unit is used for determining described functional value a according to the parameter that the parameter determining unit obtains.
Comparing unit is used for more described functional value a and default choice criteria a
1And a
2If, described functional value less than or smaller or equal to the lower limit a of choice criteria
2, then select the minimum subsystem of channel quality requirement as target sub system, triggering at random, access unit inserts on described target sub system at random; If described functional value greater than or more than or equal to the higher limit a of choice criteria
1, then select the highest subsystem of channel quality requirement as target sub system, triggering at random, access unit inserts on described target sub system at random; If described functional value then triggers channel quality measurement unit in up and down between the threshold value of described choice criteria.
Channel quality measurement unit, be used for measuring the channel quality of other subsystem of described wireless access network except that basic subsystem, according to measurement result, select the best subsystem of channel quality in the wireless access network as target sub system, triggering at random, access unit inserts on described target sub system at random.
Access unit is used for inserting at random on described target sub system at random.
In second kind of embodiment of described random access system, described preset parameter module 401 further is provided with a preferred subsystem information that is applicable to this terminal; The choice criteria of described default target sub system is the channel quality value that described terminal needs; And described access module at random 403 specifically comprises:
First channel quality measurement unit is used to measure the channel quality of described preferred subsystem.
Judging unit, be used to judge whether channel quality that first channel quality measurement unit obtains satisfies the channel quality value of default described terminal needs, if, then with described preferred subsystem as target sub system, triggering at random, access unit inserts on described target sub system at random; Otherwise, trigger the second channel quality measurement unit.
The second channel quality measurement unit, be used for measuring the channel quality of other subsystem of described wireless access network except that described preferred subsystem, according to measurement result, select the best subsystem of channel quality in the wireless access network as target sub system, triggering at random, access unit inserts on described target sub system at random.
Access unit is used for inserting at random on described target sub system at random.
In the process of the channel quality of measuring a plurality of subsystems, owing to have bigger otherness between each subsystem, therefore the quantity of the receiver that can have according to wireless communication terminal adopts different metering systems.When described wireless communication terminal had a plurality of receiver at different sub-systems, described method of measurement was specially: utilize each receiver to measure the channel quality of corresponding subsystem simultaneously; When described wireless communication terminal has a receiver, then described method of measurement is specially: adopt time division way to measure the channel quality of described each subsystem respectively.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (11)
1. the accidental access method of the wireless access network of a multiple subsystem is characterized in that, default basic subsystem from the multiple subsystem of described wireless access network, and the choice criteria of goal-selling subsystem; With the terminal of idle condition attached on the basic subsystem;
When the terminal of idle condition need insert at random, comprising:
A, definite parameter relevant with the choice criteria of described target sub system according to determined parameter and described choice criteria, are determined target sub system;
B, on described target sub system, insert at random;
Wherein, the choice criteria of described target sub system is the function based on terminal velocity, traffic carrying capacity and subsystem channel quality, the concrete value of described default choice criteria is the threshold value up and down according to the determined described function of simulation result, the scene of higher limit respective channels environmental requirement strictness wherein, the loose scene of lower limit respective channels environmental requirement; The described parameter relevant with choice criteria is terminal velocity, traffic carrying capacity, subsystem channel quality.
2. method according to claim 1 is characterized in that steps A specifically comprises:
A1, terminal are estimated self speed, measure the channel quality of basic subsystem, and definite traffic carrying capacity;
A2, the parameter that obtains according to steps A 1 are determined the functional value of described function;
A3, more described functional value and default choice criteria are if described functional value less than the lower limit of choice criteria, is then selected to the minimum subsystem of channel quality requirement as target sub system execution in step B; If described functional value greater than the higher limit of choice criteria, is then selected the highest subsystem of channel quality requirement as target sub system, execution in step B; If described functional value is at up and down between the threshold value of described choice criteria, then execution in step A4;
A4, measure the channel quality of other subsystem except that basic subsystem in the described wireless access network, according to measurement result, the best subsystem of channel quality is as target sub system in the selection wireless access network.
3. method according to claim 2, it is characterized in that, terminal under the described idle condition receives only the broadcast on the described basic subsystem, and comprises the random access parameter information of other subsystem of described wireless access network in the broadcast on the described basic subsystem; Among the step B, terminal utilizes the random access parameter information of the target sub system in the basic subsystem broadcast to finish random access procedure.
4. method according to claim 2 is characterized in that, described basic subsystem is to realize the subsystem of the seamless covering of wide area in the described wireless access network.
5. method according to claim 2, it is characterized in that, when described terminal had a plurality of receiver at different sub-systems, the concrete grammar of the channel quality of other subsystem was in the described wireless access network of described measurement: utilize each receiver to measure the channel quality of corresponding subsystem simultaneously;
When described terminal has a receiver, the concrete grammar of the channel quality of other subsystem is in the described wireless access network of then described measurement: adopt time division way to measure the channel quality of each subsystem respectively.
6. the accidental access method of the wireless access network of a multiple subsystem is characterized in that, default basic subsystem from the multiple subsystem of described wireless access network, and the choice criteria of goal-selling subsystem; With the terminal of idle condition attached on the basic subsystem;
When the terminal of idle condition need insert at random, comprising:
A, definite parameter relevant with the choice criteria of described target sub system according to determined parameter and described choice criteria, are determined target sub system;
B, on described target sub system, insert at random;
Wherein, described method further comprises by prior information definite preferred subsystem that is applicable to this terminal from described wireless access network; The choice criteria of described default target sub system is the channel quality value that most probable satisfies described terminal needs; And described steps A specifically comprises:
The channel quality of a1, the described preferred subsystem of measurement;
Whether the channel quality that a2, determining step a1 obtain satisfies the channel quality value of default described terminal needs, if, then with described preferred subsystem as target sub system, execution in step B; Otherwise, execution in step a3;
A3, measure the channel quality of other subsystem except that described preferred subsystem in the described wireless access network, according to measurement result, the best subsystem of channel quality is as target sub system in the selection wireless access network.
7. method according to claim 6 is characterized in that, among the described step B, terminal obtains the random access parameter information of target sub system by the broadcast that reads target sub system, and utilizes this random access parameter information to finish random access procedure.
8. method according to claim 6 is characterized in that,
When described terminal had a plurality of receiver at different sub-systems, the concrete grammar of the channel quality of other subsystem was in the described wireless access network of described measurement: utilize each receiver to measure the channel quality of corresponding subsystem simultaneously;
When described terminal has a receiver, the concrete grammar of the channel quality of other subsystem is in the described wireless access network of then described measurement: adopt time division way to measure the channel quality of each subsystem respectively.
9. the random access system of the wireless access network of a multiple subsystem is characterized in that, comprising:
Preset parameter module, wherein default basic subsystem, and the choice criteria of goal-selling subsystem;
Attachable module, be used to impel wireless communication terminal when idle condition attached to described basic subsystem;
Access module is used for determining the parameter relevant with the choice criteria of described target sub system when inserting at random at random, according to determined parameter and described choice criteria, determines target sub system, and inserts at random on described target sub system;
Wherein, the choice criteria of described target sub system is the function based on terminal velocity, traffic carrying capacity and subsystem channel quality, described default choice criteria is the threshold value up and down according to the determined described function of simulation result, the scene of higher limit respective channels environmental requirement strictness wherein, the loose scene of lower limit respective channels environmental requirement; The described parameter relevant with choice criteria is terminal velocity, traffic carrying capacity, subsystem channel quality.
10. random access system according to claim 9 is characterized in that, described access module at random specifically comprises:
The parameter determining unit is used to estimate terminal self speed, measures the channel quality of basic subsystem, and definite traffic carrying capacity;
The function calculation unit is used for the functional value of the described function of calculation of parameter that obtains according to the parameter determining unit;
Comparing unit, be used for more described functional value and default choice criteria, if described functional value less than or smaller or equal to the lower limit of choice criteria, then select the minimum subsystem of channel quality requirement as target sub system, triggering at random, access unit inserts on described target sub system at random; If described functional value greater than or more than or equal to the higher limit of choice criteria, then select the highest subsystem of channel quality requirement as target sub system, triggering at random, access unit inserts on described target sub system at random; If described functional value then triggers channel quality measurement unit in up and down between the threshold value of described choice criteria;
Channel quality measurement unit, be used for measuring the channel quality of other subsystem of described wireless access network except that basic subsystem, according to measurement result, select the best subsystem of channel quality in the wireless access network as target sub system, triggering at random, access unit inserts on described target sub system at random;
Access unit is used for inserting at random on described target sub system at random.
11. the random access system of the wireless access network of a multiple subsystem is characterized in that, comprising:
Preset parameter module, wherein default basic subsystem, and the choice criteria of goal-selling subsystem;
Attachable module, be used to impel wireless communication terminal when idle condition attached to described basic subsystem;
Access module is used for determining the parameter relevant with the choice criteria of described target sub system when inserting at random at random, according to determined parameter and described choice criteria, determines target sub system, and inserts at random on described target sub system;
Wherein, described preset parameter module further is provided with a preferred subsystem information that is applicable to this terminal; The choice criteria of described default target sub system is the channel quality value that described terminal needs; And described access module at random specifically comprises:
First channel quality measurement unit is used to measure the channel quality of described preferred subsystem;
Judging unit, be used to judge whether channel quality that first channel quality measurement unit obtains satisfies the channel quality value of default described terminal needs, if, then with described preferred subsystem as target sub system, triggering at random, access unit inserts on described target sub system at random; Otherwise, trigger the second channel quality measurement unit;
The second channel quality measurement unit, be used for measuring the channel quality of other subsystem of described wireless access network except that described preferred subsystem, according to measurement result, select the best subsystem of channel quality in the wireless access network as target sub system, triggering at random, access unit inserts on described target sub system at random;
Access unit is used for inserting at random on described target sub system at random.
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