CN102625461A - Method and system for random access to heterogeneous network - Google Patents
Method and system for random access to heterogeneous network Download PDFInfo
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- CN102625461A CN102625461A CN2011103401607A CN201110340160A CN102625461A CN 102625461 A CN102625461 A CN 102625461A CN 2011103401607 A CN2011103401607 A CN 2011103401607A CN 201110340160 A CN201110340160 A CN 201110340160A CN 102625461 A CN102625461 A CN 102625461A
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Abstract
The invention discloses a method for random access to a heterogeneous network, which includes: receiving random access messages initiated by a user terminal; according to the random access messages, sectionalizing all component carriers of the user terminal based on the timing advance to form carrier groups; sending the responding messages of random access to the user terminal, so that the user terminal can finish the random access on the component carriers of the carrier groups. The invention further provides a corresponding system for random access to the heterogeneous network, which comprises the user terminal and base stations. By the aid of the method and the system for random access to the heterogeneous network, the rate of resource conflict arising in the heterogeneous network can be reduced effectively and the success rate of the random access performed by the user equipment can be improved.
Description
Technical field
The present invention relates to wireless communication field, specially refer to the method and system that insert at random in a kind of heterogeneous network.
Background technology
In follow-on broadband wireless communication network, solve problem how under the bandwidth of current wireless communication system, to support bigger bandwidth, become the key factor that improves inter-cell user terminal throughput and user terminal average throughput.At present; Long-term technological evolution (LTE in third generation partner program; Long Term Evolution) propose to adopt the mode of carrier aggregation to come in current wireless communication system, to support effectively bigger bandwidth in, to satisfy in the new generation of wireless standard demand to indexs such as throughput, peak rates.Carrier aggregation is to support the key technology of bigger bandwidth in the future broadband wireless communication systems; Through different carrier waves is carried out polymerization; Form the carrier wave of bigger bandwidth, on the bandwidth after the polymerization, support to have the user side (UE, User Equipment) of stronger ability; For example, the bandwidth that surpasses 100MHz in senior Long Term Evolution (LTE-Advanced) technology.
In the paradigmatic system of existing many composition carrier waves, there is serious problem in the transmission of carrier wave indicator field (CIF, Carrier Indicator Field) and system information (SI, System Information).When CIF and SI with random access radio network temporary mark (RA-RNTI; Random Access Radio Network Temporary Identifier) or Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI; When Cell Radio Network Temporary Identifier) transmitting on the control channel of scrambling; The CIF of indexed resource transmission and SI need be comprised in each common search of forming carrier wave (CC, Component Carriers) interval on each control channel, so just can cause the resource shortage in the common search interval; And; Owing to introduced new down link control information (DCI, Downlink Control Information) form, thereby the blind decoding number that causes attempting in the common search interval increases.Simultaneously, the Timing Advance on CC (TA, Timing Advance) is when being one or more; Insert (RA at random; Random Access) process just possibly be assigned with on one or more CC, like this, and when the RA process of UE on one or more CC all failed; When UE strides carrier wave RA process, also need be provided with again for the CIF and the SI of indexed resource transmission.
Summary of the invention
Main purpose of the present invention is that the method that inserts at random in a kind of heterogeneous network is provided, and can be reduced in the problem of resource contention in the heterogeneous network effectively, and can improve the success rate that user terminal inserts at random.
The present invention provides the method that inserts at random in a kind of heterogeneous network, comprising:
Receive the random accessing message that user terminal is initiated;
Divide into groups according to Timing Advance according to said random accessing message all composition carrier waves, form carrier set user terminal;
Send accidental access response message to user terminal, insert for accomplishing at random on the composition carrier wave of user terminal in said carrier set.
Preferably, saidly according to random accessing message all of user terminal are formed carrier waves and divide into groups carrying out, form after the carrier set, also comprise according to Timing Advance:
According to the disturbance regime of composition carrier wave in the sub-district in the said carrier set to the carrier set prioritization.
Preferably, said to user terminal transmission accidental access response message, specifically comprise for accomplishing on the composition carrier wave of user terminal in said carrier set to insert at random:
Send accidental access response message to user terminal, comprising the carrier wave indicator field and the system information of indicating through the control channel of random access radio network temporary mark scrambling;
Initiate on the composition carrier wave of dispatched users terminal in the high carrier set of priority to insert at random; And, wherein comprise carrier wave indicator field and system information through the control channel indication of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI scrambling for user terminal produces on the DSCH Downlink Shared Channel based on the solution of competition;
User terminal decode said carrier wave indicator field and system information finish access process at random.
Preferably, before initiating access at random on the composition carrier wave of the said user terminal of execution in the high carrier set of priority, also comprise:
In said carrier set, be chosen in the minimum composition carrier wave of interference in the sub-district, insert at random for user terminal.
Preferably, after the execution user terminal is decoded said carrier wave indicator field and system information, also comprise:
Whether judges terminal successfully decode said carrier wave indicator field and system information if user terminal inserts success at random, finish access process at random;
If not, user terminal disturbs in carrier set on the minimum composition carrier wave successively according to priority order from high to low and initiates random accessing message, insert success at random to user terminal, otherwise user terminal is access failure at random.
The present invention also provides the system that inserts at random in a kind of heterogeneous network, comprises user terminal and base station, and said base station comprises:
Receiver module is used to receive the random accessing message that user terminal is initiated;
Grouping module is used for dividing into groups according to Timing Advance according to said random accessing message all composition carrier waves with user terminal, forms carrier set;
AM access module is used for sending accidental access response message to user terminal, inserts for accomplishing at random on the composition carrier wave of user terminal in said carrier set.
Preferably, said base station also comprises:
Divide module, be used for the disturbance regime of composition carrier wave in the sub-district according to said carrier set the carrier set prioritization.
Preferably, said AM access module comprises:
Response unit is used for sending accidental access response message to user terminal, comprising the carrier wave indicator field and the system information of indicating through the control channel of random access radio network temporary mark scrambling;
Scheduling unit; Being used for the dispatched users terminal initiates to insert at random on the composition carrier wave of the high carrier set of priority; And, wherein comprise carrier wave indicator field and system information through the control channel indication of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI scrambling for user terminal produces on the DSCH Downlink Shared Channel based on the solution of competition; After user terminal is decoded said carrier wave indicator field and system information, finish access process at random.
Preferably, said AM access module also comprises:
Selected cell is used for being chosen in the minimum composition carrier wave of interference in the sub-district in said carrier set, inserts at random for user terminal.
Preferably, said base station also comprises:
Judge module is used for judges terminal whether successfully decode said carrier wave indicator field and system information, if user terminal inserts success at random, finishes access process at random;
Scheduler module is used for if not, and then the dispatched users terminal is disturbed in carrier set on the minimum composition carrier wave successively according to priority order from high to low and initiated random accessing message, inserts success at random to user terminal.
The present invention is through dividing into groups according to timing advance TA to employed all the composition carrier waves of user terminal; Promptly will form carrier wave and be divided into different carrier set according to different Timing Advances; And each carrier set according to the minimum composition carrier wave of the interference in the sub-district wherein, is carried out the division of priority to the carrier set at its place according to its disturbance regime.Adopt this method; In follow-up access process at random; Carrier wave indicator field CIF and system information SI only need disturb minimum, form and carry on the carrier wave and transmit the most reliably, and need not be comprised in each common search of forming carrier wave at interval in, thereby can not cause the problem of the resource shortage of common search at interval; Promptly can be reduced in the problem of resource contention in the heterogeneous network effectively; Simultaneously, because in window at the same time, and in preset largest random inserts the number of times scope; Can allow the user terminal initiation repeatedly based on the random accessing message of competing, thereby can improve the probability of success that user terminal inserts at random to a great extent.
Description of drawings
Fig. 1 is the schematic flow sheet of method one embodiment that inserts at random in the heterogeneous network of the present invention;
The schematic flow sheet of Fig. 2 for inserting at random among method one embodiment that inserts at random in the heterogeneous network of the present invention;
Fig. 3 is the schematic flow sheet of the another embodiment of method that inserts at random in the heterogeneous network of the present invention;
Fig. 4 is the method that inserts at random in the heterogeneous network of the present invention schematic flow sheet of an embodiment again;
Fig. 5 is the structural representation of the system that inserts at random in the heterogeneous network of the present invention;
Fig. 6 is the structural representation of base station among one embodiment of system that inserts at random in the heterogeneous network of the present invention;
Fig. 7 is the structural representation of AM access module among Fig. 6;
Fig. 8 is the structural representation of the another embodiment of system that inserts at random in the heterogeneous network of the present invention;
Fig. 9 is the system that inserts at random in the heterogeneous network of the present invention structural representation of an embodiment again.
The realization of the object of the invention, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
With reference to Fig. 1, method one embodiment that inserts is at random proposed in the heterogeneous network of the present invention, this method comprises:
Step S101 receives the random accessing message that user terminal is initiated;
In the present embodiment, the composition carrier wave in the polymerization carrier system is indicated accordingly and dispose, can reduce between base station and the user terminal about forming the Signalling exchange of carrier wave through the base station.When user terminal need insert on the composition carrier wave in the polymerization carrier system at random, just can initiate a random accessing message to the base station, at this moment, the base station receives this random accessing message.In the present embodiment; The base station can be the preset access way at random based on competition of user terminal; The maximum number of times of access at random promptly is set in each time window, and can inserts number of times at random according to this and judge that the access at random in time window is success or failure.
Step S102 divides into groups according to Timing Advance according to said random accessing message all composition carrier waves with user terminal, forms carrier set;
Behind the random accessing message that receives the user terminal initiation; At first can analyze all link informations of the user terminal of initiating random accessing message; And employed all the composition carrier waves of user terminal are divided into groups according to timing advance TA, will form carrier wave according to different Timing Advances and be divided into different carrier set.
Step S103 sends accidental access response message to user terminal, inserts for accomplishing at random on the composition carrier wave of user terminal in said carrier set.
In the present embodiment; When user terminal is initiated random accessing message, at first can send a lead code to the base station, after this lead code is received in the base station; Just can be according to the Physical Random Access Channel resource of lead code; Obtain and its corresponding random access of radio network temporary mark RA-RNTI, and, promptly send accidental access response message to user terminal through this RA-RNTI feedback accidental access response message;, after receiving response message, accomplish at random on the composition carrier wave in carrier set and insert for user terminal.
In the above-described embodiments, the method that inserts at random in the heterogeneous network also comprises:
Step S104, according to the disturbance regime of composition carrier wave in the sub-district in the said carrier set to the carrier set prioritization.
Employed after all form carrier waves and be divided into different carrier set according to timing advance TA to user terminal, in each carrier set, can find a composition carrier wave that the interference in the sub-district is minimum; And form the disturbance regime of carrier wave according to this; The carrier set at its place is carried out the division of priority, and it is more little promptly to form the interference of carrier wave in the sub-district, and the priority level of the carrier set at its place is just high more; Otherwise the priority level of carrier set is just low more.
The method that inserts at random in the heterogeneous network provided by the present invention; Through employed all the composition carrier waves of user terminal are divided into groups according to timing advance TA; Promptly will form carrier wave and be divided into different carrier set according to different Timing Advances; And each carrier set according to the minimum composition carrier wave of the interference in the sub-district wherein, is carried out the division of priority to the carrier set at its place according to its disturbance regime.Adopt this method; In follow-up access process at random; Carrier wave indicator field CIF and system information SI only need disturb minimum, form and carry on the carrier wave and transmit the most reliably, and need not be comprised in each common search of forming carrier wave at interval in, thereby can not cause the problem of the resource shortage of common search at interval; Promptly can be reduced in the problem of resource contention in the heterogeneous network effectively, can improve the success rate that user terminal inserts at random simultaneously.
With reference to Fig. 2, among method one embodiment that in heterogeneous network of the present invention, inserts at random, step S103 specifically comprises:
Step S1031 sends accidental access response message to user terminal, comprising the carrier wave indicator field and the system information of indicating through the control channel of random access radio network temporary mark scrambling;
Behind the random accessing message that receives the user terminal initiation; Can give user terminal through accidental access response message of random access radio network temporary mark RA-RNTI feedback; In this accidental access response message, be included as composition carrier wave in the carrier set the carrier wave indicator field CIF and the system information SI that are used for the control channel indication of preliminary appointment.In the present embodiment; The situation that CIF can comprise the employed composition carrier wave of user terminal and position amount, connected mode, composition carrier wave, form centre carrier frequency and form the SI that carrier wave carried, this CIF can according to follow-up base station institute progressively the user terminal channel quality of acquisition change; And SI can comprise information such as centre carrier frequency, leading and synchronous channel position, and it can not change in follow-up flow process yet.
Step S1032; Initiate on the composition carrier wave of dispatched users terminal in the high carrier set of priority to insert at random; And, wherein comprise carrier wave indicator field and system information through the control channel indication of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI scrambling for user terminal produces on the DSCH Downlink Shared Channel based on the solution of competition;
After will being sent to user terminal through the accidental access response message that RA-RNTI fed back; Just begin according to timing advance TA; Come the dispatched users terminal to initiate to insert at random; At this moment, user terminal can initiate to insert at random on the composition carrier wave in the highest carrier set of its employed all carrier set medium priorities.At first; Inserting at random that user terminal is initiated is meant the transmission of carrying out up link on the carrier wave first forming; Then; The base station can produce on the DSCH Downlink Shared Channel solution based on competition for user terminal, comprising the carrier wave indicator field CIF and the system information SI of the control channel indication through the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI scrambling, and carries out the synchronous trial of down link first according to CIF and SI.
Step S1033, user terminal decode said carrier wave indicator field and system information finish access process at random.
Forming the transmission of carrying out up link on the carrier wave first when user terminal; And successfully realized according to CIF and SI carry out down link first synchronously after; That is to say that user terminal is decoded successfully to CIF and SI, at this moment; Can insert success at random in the judges terminal, just can finish access process at random.
According to first timing advance TA; Inserting at random first of user terminal dispatched; Make user terminal at first initiate to insert at random on the composition carrier wave in its employed all the highest grades of carrier set medium priority carrier set; Because the interference of the composition carrier wave in the highest carrier set of priority level in the sub-district is minimum, therefore, just can improve the success rate that user terminal inserts first at random; And carrier wave indicator field CIF and system information SI need not be comprised in each common search of forming carrier wave interval, thereby can not cause the problem of the resource shortage in the common search interval.
With reference to Fig. 3, the another embodiment of method that inserts is at random proposed in the heterogeneous network of the present invention, step S103 also comprises:
Step S1034 is chosen in the minimum composition carrier wave of interference in the sub-district in said carrier set, insert at random for user terminal.
After will being sent to user terminal through the accidental access response message that RA-RNTI fed back; Carrying out based on timing advance TA; Come the dispatched users terminal to initiate before the process of access at random, can also in the carrier set that employed composition carrier wave is divided into according to Timing Advance to user terminal, form the disturbance regime of carrier waves in the sub-district based on all; Select interference minimum, form carrier wave the most reliably, form at this for user terminal and initiate on carrier wave to insert at random.
In carrier set, select to disturb minimum composition carrier wave to supply user terminal to insert process at random according to forming the disturbance regime of carrier wave in the sub-district; In the process that inserts at random, the carrier wave indicator field CIF that is used for the transmission of control channel indexed resource and system information SI just can form on the carrier wave carrying only minimum in selected interference, the most reliably and transmit.Like this, can guarantee further that CIF and SI just need not be comprised in each common search of forming carrier wave interval, thereby can not cause the problem of the resource shortage in the common search interval.
With reference to Fig. 4, the method that proposes in the heterogeneous network of the present invention to insert at random is an embodiment again, and this method also comprises:
Step S105, whether judges terminal successfully decode said carrier wave indicator field and system information if user terminal inserts success at random, finish access process at random;
Forming the transmission of carrying out up link on the carrier wave first when user terminal; And carry out the synchronous trial of down link first according to carrier wave indicator field CIF and system information SI; Be user terminal when decoding the step of CIF and SI, also need judge that promptly the judges terminal inserts whether success first at random to whether can successfully decode CIF and SI of user terminal; CIF and SI if user terminal has successfully been decoded; Just successfully realized according to down link first synchronously, just can the judges terminal inserts successfully at random first, thereby the end flow process of access at random.
In the present embodiment; When insert at random first and the synchronization failure of down link after, the link information of more user terminal when the base station just can obtain than insert at random first, therefore; The composition carrier wave may be redistributed for user terminal in the base station; And form carrier wave for these and divide into groups according to timing advance TA again, and the carrier set prioritization to forming after dividing into groups, and; Can reassign carrier wave indicator field CIF, and produce on the DSCH Downlink Shared Channel solution for user terminal based on competition.
Step S106, if not, user terminal disturbs in carrier set on the minimum composition carrier wave successively according to priority order from high to low and initiates random accessing message, insert success at random to user terminal, otherwise user terminal is access failure at random.
CIF and SI if user terminal is not successfully decoded; Just realize according to down link first synchronously; Just access failure at random first that can the judges terminal, at this moment, user terminal just can be in window at the same time; According to priority level order from high to low; Initiate random accessing message removing to disturb on the minimum composition carrier wave in other carrier set outside the selected carrier set when inserting at random first successively, and carry out whether can successfully the decode process of CIF and SI of judges terminal equally, whether successfully to insert at random to judge.If the access at random that user terminal is formed on the carrier wave in being in the carrier set of all priority levels is all failed; Perhaps to have surpassed the base station be that the default largest random of user terminal inserts number of times to the user terminal number of times of access at random of in window at the same time, being initiated; At this moment, access failure at random that just can the judges terminal, the base station can be broken off and being connected of user terminal; And user terminal need be waited for next time window, in this time window, initiates again then to insert at random.
Whether inserting at random first of judges terminal be successful, after success, finishes access process at random; As access failure at random first; Then can be in window at the same time; According to priority level order from high to low; Initiate random accessing message removing to disturb on the minimum composition carrier wave in other carrier set outside the selected carrier set when inserting at random first successively, until inserting successfully at random.Adopt this method; In window at the same time; And in preset largest random inserts the number of times scope, can allow the user terminal initiation repeatedly based on the random accessing message of competing, thereby can increase the probability of success that user terminal inserts at random to a great extent.
With reference to Fig. 5 and Fig. 6, one embodiment of system that inserts is at random proposed in the heterogeneous network of the present invention, this system comprises base station and user terminal, wherein, the base station comprises:
In the present embodiment, the composition carrier wave in the polymerization carrier system is indicated accordingly and dispose, can reduce between base station and the user terminal about forming the Signalling exchange of carrier wave through the base station.When user terminal need insert on the composition carrier wave in the polymerization carrier system at random, just can initiate a random accessing message to the base station, at this moment, receiver module 10 receives this random accessing message.In the present embodiment; The base station can be the preset access way at random based on competition of user terminal; The maximum number of times of access at random promptly is set in each time window, and can inserts number of times at random according to this and judge that the access at random in time window is success or failure.
Behind the random accessing message that receives the user terminal initiation; At first can analyze all link informations of the user terminal of initiating random accessing message; And employed all the composition carrier waves of 20 pairs of user terminals of grouping module divide into groups according to timing advance TA, will form carrier wave according to different Timing Advances and be divided into different carrier set.
In the present embodiment; When user terminal is initiated random accessing message, at first can send a lead code to the base station, after this lead code is received in the base station; Just can be according to the Physical Random Access Channel resource of lead code; Obtain and its corresponding random access of radio network temporary mark RA-RNTI, and through this RA-RNTI feedback accidental access response message, i.e. AM access module 30 is sent accidental access response message to user terminal;, after receiving response message, accomplish at random on the composition carrier wave in carrier set and insert for user terminal.
In the above-described embodiments, said base station also comprises:
Employed after all form carrier waves and be divided into different carrier set according to timing advance TA to user terminal, in each carrier set, can find a composition carrier wave that the interference in the sub-district is minimum; And form the disturbance regime of carrier wave according to this; Divide module 40 carrier set at its place is carried out the division of priority, it is more little promptly to form the interference of carrier wave in the sub-district, and the priority level of the carrier set at its place is just high more; Otherwise the priority level of carrier set is just low more.
The system that inserts at random in the heterogeneous network of the present invention; Through employed all the composition carrier waves of user terminal are divided into groups according to timing advance TA; Promptly will form carrier wave and be divided into different carrier set according to different Timing Advances; And each carrier set according to the minimum composition carrier wave of the interference in the sub-district wherein, is carried out the division of priority to the carrier set at its place according to its disturbance regime.Adopt this method; In follow-up access process at random; Carrier wave indicator field CIF and system information SI only need disturb minimum, form and carry on the carrier wave and transmit the most reliably, and need not be comprised in each common search of forming carrier wave at interval in, thereby can not cause the problem of the resource shortage of common search at interval; Promptly can be reduced in the problem of resource contention in the heterogeneous network effectively, can improve the success rate that user terminal inserts at random simultaneously.
With reference to Fig. 7, among one embodiment of system that in heterogeneous network of the present invention, inserts at random, AM access module 30 comprises:
Behind the random accessing message that receives the user terminal initiation; Response unit 31 can be given user terminal through accidental access response message of random access radio network temporary mark RA-RNTI feedback; In this accidental access response message, be included as composition carrier wave in the carrier set the carrier wave indicator field CIF and the system information SI that are used for the control channel indication of preliminary appointment.In the present embodiment; The situation that CIF can comprise the employed composition carrier wave of user terminal and position amount, connected mode, composition carrier wave, form centre carrier frequency and form the SI that carrier wave carried, this CIF can according to follow-up base station institute progressively the user terminal channel quality of acquisition change; And SI can comprise information such as centre carrier frequency, leading and synchronous channel position, and it can not change in follow-up flow process yet.
After will being sent to user terminal through the accidental access response message that RA-RNTI fed back; Scheduling unit 32 just begins according to timing advance TA; Come the dispatched users terminal to initiate to insert at random; At this moment, user terminal can initiate to insert at random on the composition carrier wave in the highest carrier set of its employed all carrier set medium priorities.At first; Inserting at random that user terminal is initiated is meant the transmission of carrying out up link on the carrier wave first forming; Then; The base station can produce on the DSCH Downlink Shared Channel solution based on competition for user terminal, comprising the carrier wave indicator field CIF and the system information SI of the control channel indication through the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI scrambling, and carries out the synchronous trial of down link first according to CIF and SI.
Forming the transmission of carrying out up link on the carrier wave first when user terminal; And successfully realized according to CIF and SI carry out down link first synchronously after; That is to say that user terminal is decoded successfully to CIF and SI, at this moment; Can insert success at random in the judges terminal, just can finish access process at random.
According to first timing advance TA; Inserting at random first of user terminal dispatched; Make user terminal at first initiate to insert at random on the composition carrier wave in its employed all the highest grades of carrier set medium priority carrier set; Because the interference of the composition carrier wave in the highest carrier set of priority level in the sub-district is minimum, therefore, just can improve the success rate that user terminal inserts first at random; And carrier wave indicator field CIF and system information SI need not be comprised in each common search of forming carrier wave interval, thereby can not cause the problem of the resource shortage in the common search interval.
With reference to Fig. 8, the another embodiment of system that inserts is at random proposed in the heterogeneous network of the present invention, said AM access module 30 also comprises:
After will being sent to user terminal through the accidental access response message that RA-RNTI fed back; Carrying out according to timing advance TA; Come the dispatched users terminal to initiate before the process of access at random; Selected cell 33 can also be in the carrier set that employed composition carrier wave is divided into according to Timing Advance to user terminal; Form the disturbance regime of carrier waves in the sub-district according to all, selects interferences minimum, form carrier wave the most reliably, form initiation access at random on carrier wave for user terminal at this.
In carrier set, select to disturb minimum composition carrier wave to supply user terminal to insert process at random according to forming the disturbance regime of carrier wave in the sub-district; In the process that inserts at random, the carrier wave indicator field CIF that is used for the transmission of control channel indexed resource and system information SI just can form on the carrier wave carrying only minimum in selected interference, the most reliably and transmit.Like this, can guarantee further that CIF and SI just need not be comprised in each common search of forming carrier wave interval, thereby can not cause the problem of the resource shortage in the common search interval.
With reference to Fig. 9, the system that proposes in the heterogeneous network of the present invention to insert at random is an embodiment again, and said base station also comprises:
Forming the transmission of carrying out up link on the carrier wave first when user terminal; And carry out the synchronous trial of down link first according to carrier wave indicator field CIF and system information SI; Be user terminal when decoding the step of CIF and SI, judge module 50 also need judge whether can successfully decode CIF and SI of user terminal, and promptly the judges terminal inserts whether success first at random; CIF and SI if user terminal has successfully been decoded; Just successfully realized according to down link first synchronously, just can the judges terminal inserts successfully at random first, thereby the end flow process of access at random.
In the present embodiment; When insert at random first and the synchronization failure of down link after, the link information of more user terminal when the base station just can obtain than insert at random first, therefore; The composition carrier wave may be redistributed for user terminal in the base station; And form carrier wave for these and divide into groups according to timing advance TA again, and the carrier set prioritization to forming after dividing into groups, and; Can reassign carrier wave indicator field CIF, and produce on the DSCH Downlink Shared Channel solution for user terminal based on competition.
CIF and SI if user terminal is not successfully decoded; Just realize according to down link first synchronously; Just access failure at random first that can the judges terminal, at this moment, scheduler module 60 just can the dispatched users terminal in window at the same time; According to priority level order from high to low; Initiate random accessing message removing to disturb on the minimum composition carrier wave in other carrier set outside the selected carrier set when inserting at random first successively, and carry out whether can successfully the decode process of CIF and SI of judges terminal equally, whether successfully to insert at random to judge.If the access at random that user terminal is formed on the carrier wave in being in the carrier set of all priority levels is all failed; Perhaps to have surpassed the base station be that the default largest random of user terminal inserts number of times to the user terminal number of times of access at random of in window at the same time, being initiated; At this moment, access failure at random that just can the judges terminal, the base station can be broken off and being connected of user terminal; And user terminal need be waited for next time window, in this time window, initiates again then to insert at random.
Whether inserting at random first of judges terminal be successful, after success, finishes access process at random; As access failure at random first; Then can be in window at the same time; According to priority level order from high to low; Initiate random accessing message removing to disturb on the minimum composition carrier wave in other carrier set outside the selected carrier set when inserting at random first successively, until inserting successfully at random.Adopt this method; In window at the same time; And in preset largest random inserts the number of times scope, can allow the user terminal initiation repeatedly based on the random accessing message of competing, thereby can increase the probability of success that user terminal inserts at random to a great extent.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.
Claims (10)
1. the method that inserts at random in the heterogeneous network is characterized in that, comprising:
Receive the random accessing message that user terminal is initiated;
Divide into groups according to Timing Advance according to said random accessing message all composition carrier waves, form carrier set user terminal;
Send accidental access response message to user terminal, insert for accomplishing at random on the composition carrier wave of user terminal in said carrier set.
2. the method for claim 1 is characterized in that, saidly according to random accessing message all of user terminal is formed carrier waves and divides into groups according to Timing Advance carrying out, and forms after the carrier set, also comprises:
According to the disturbance regime of composition carrier wave in the sub-district in the said carrier set to the carrier set prioritization.
3. method as claimed in claim 2 is characterized in that, and is said to user terminal transmission accidental access response message, specifically comprises for accomplishing on the composition carrier wave of user terminal in said carrier set to insert at random:
Send accidental access response message to user terminal, comprising the carrier wave indicator field and the system information of indicating through the control channel of random access radio network temporary mark scrambling;
Initiate on the composition carrier wave of dispatched users terminal in the high carrier set of priority to insert at random; And, wherein comprise carrier wave indicator field and system information through the control channel indication of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI scrambling for user terminal produces on the DSCH Downlink Shared Channel based on the solution of competition;
User terminal decode said carrier wave indicator field and system information finish access process at random.
4. method as claimed in claim 3 is characterized in that, before initiating access at random on the composition carrier wave of the said user terminal of execution in the high carrier set of priority, also comprises:
In said carrier set, be chosen in the minimum composition carrier wave of interference in the sub-district, insert at random for user terminal.
5. method as claimed in claim 4 is characterized in that, after the execution user terminal is decoded said carrier wave indicator field and system information, also comprises:
Whether judges terminal successfully decode said carrier wave indicator field and system information if user terminal inserts success at random, finish access process at random;
If not, user terminal disturbs in carrier set on the minimum composition carrier wave successively according to priority order from high to low and initiates random accessing message, insert success at random to user terminal, otherwise user terminal is access failure at random.
6. the system that inserts at random in the heterogeneous network comprises user terminal and base station, it is characterized in that said base station comprises:
Receiver module is used to receive the random accessing message that user terminal is initiated;
Grouping module is used for dividing into groups according to Timing Advance according to said random accessing message all composition carrier waves with user terminal, forms carrier set;
AM access module is used for sending accidental access response message to user terminal, inserts for accomplishing at random on the composition carrier wave of user terminal in said carrier set.
7. system as claimed in claim 6 is characterized in that, said base station also comprises:
Divide module, be used for the disturbance regime of composition carrier wave in the sub-district according to said carrier set the carrier set prioritization.
8. system as claimed in claim 7 is characterized in that, said AM access module comprises:
Response unit is used for sending accidental access response message to user terminal, comprising the carrier wave indicator field and the system information of indicating through the control channel of random access radio network temporary mark scrambling;
Scheduling unit; Being used for the dispatched users terminal initiates to insert at random on the composition carrier wave of the high carrier set of priority; And, wherein comprise carrier wave indicator field and system information through the control channel indication of Cell Radio Network Temporary Identifier/Identity, Cell-RNTI scrambling for user terminal produces on the DSCH Downlink Shared Channel based on the solution of competition; After user terminal is decoded said carrier wave indicator field and system information, finish access process at random.
9. system as claimed in claim 8 is characterized in that, said AM access module also comprises:
Selected cell is used for being chosen in the minimum composition carrier wave of interference in the sub-district in said carrier set, inserts at random for user terminal.
10. system as claimed in claim 8 is characterized in that, said base station also comprises:
Judge module is used for judges terminal whether successfully decode said carrier wave indicator field and system information, if user terminal inserts success at random, finishes access process at random;
Scheduler module is used for if not, and then the dispatched users terminal is disturbed in carrier set on the minimum composition carrier wave successively according to priority order from high to low and initiated random accessing message, inserts success at random to user terminal.
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