CN101217821B - A traveling carriage access method of traveling carriage initiative mobile communication system - Google Patents
A traveling carriage access method of traveling carriage initiative mobile communication system Download PDFInfo
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- CN101217821B CN101217821B CN2008100563631A CN200810056363A CN101217821B CN 101217821 B CN101217821 B CN 101217821B CN 2008100563631 A CN2008100563631 A CN 2008100563631A CN 200810056363 A CN200810056363 A CN 200810056363A CN 101217821 B CN101217821 B CN 101217821B
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Abstract
The invention relates to a mobile station access method of a mobile station active mobile communication system. The method mainly comprises that all random access channels are scanned by the mobile station; the noise levels N of the channels are sequentially measured; an inquiry burst with the lowest power Pmin is emitted by selecting a random access channel with the lowest noise level; if the response ACKB of the base station is not received within a certain interval Delta T, an inquiry burst with the power of Pmin plus Delta P is emitted at a position aligned with a mobile station clock after Delta T; if the response ACKB of the base station is still not received, an inquiry burst with the power of Pmin plus the Delta P multiplied by two is emitted after Delta T, till the response ACKB of the base station is received; the base station instructs the mobile station to switch to a service channel which is distributed by the base station when the call service is started. The method can lead the utilization ratio of the random access channel to be maximum, which reduces the noise of the whole system and achieves the object of reasonable and optimized system uplink access channel.
Description
Technical field
The present invention relates to a kind of cut-in method of mobile communication system, be specifically related to the initiatively access method of traveling carriage of mobile communication system of travelling carriage.
Background technology
In traditional mobile communication system, ceaselessly launch the beacon channel signal by the base station always.After the mobile platform started, just can be by to search, the locking of beacon channel, again in conjunction with synchronizing channel or frequency correction channel, finish the synchronizing process with the base station, reside on the best sub-district of beacon channel signal quality.Travelling carriage utilizes the uplink random access channel to initiate access procedure on resident sub-district.System utilizes down control channel to finish the registration of travelling carriage, and the indication travelling carriage returns idle condition, is ready for calling.
At travelling carriage initiatively in the mobile communication system, the beacon channel signal of emission always not, when the travelling carriage Request System serve, system inserted website accordingly and launches pilot tone and system information, has reduced system interference.Travelling carriage is when mobile, the quality of base station monitors reverse link traffic channel, the quality of travelling carriage monitoring downlink traffic channel is when the quality of upstream or downstream Traffic Channel drops under the handoff threshold, just switch, guarantee the accuracy of switch decision and switch the necessity of implementing.Since the beacon channel signal that does not have the base station always to launch, the restriction of just having broken honeycomb, and the base station can make full use of the power resource of oneself.Also reduced restriction to base station selection.Travelling carriage can select the base station of resource affluence to insert, and reduces potential switching times on the one hand, reduces the idle amount of base station resource, improves resource utilization, the load between the balance base station on the other hand.The pond, base station is formed in a plurality of base stations, carries out sharing of base station resource, utilizes a plurality of antenna mutual group at many stylobates station to become antenna array, is equivalent to utilize bigger many input and output MIMO antenna array, improves traffic rate, thereby improves power system capacity.For each active mobile station, all there is a virtual lock unit to be synchronized on the clock of travelling carriage in the base station.Because travelling carriage is the mobile communication system beacon channel of emission always not initiatively, travelling carriage can not select once starting shooting resident sub-district and and the sub-district synchronous.In addition, travelling carriage active mobile communication system also wishes to reduce to greatest extent the shared resource of descending Common Control Channel.
In view of also not improving initiatively access way of rational travelling carriage at present, therefore need reasonably design travelling carriage access channel and corresponding mobile station cut-in method in the travelling carriage active mobile communication system.
Summary of the invention
The object of the present invention is to provide the initiatively access method of traveling carriage of mobile communication system of travelling carriage.
At first introduce the initiatively operation principle of mobile communication system of travelling carriage, this system comprises:
Travelling carriage also is subscriber equipment, comprises making a call and two kinds of uses of quilt calling situations.When Mobile Origination is called out, at first cover its base station by system's common uplink access channel inquiry, after receiving response message, the answer signal signal to noise ratio that receives is ranked, allow under the situation of user's access at the base station load, the base station of selected signal to noise ratio maximum is inserted, and this process is called access procedure.When mobile terminated the time, by paging base station travelling carriage is carried out paging, when travelling carriage is received the beep-page message of oneself, enter access procedure, in access procedure, the selected base station that connects, after the access,, be ready to converse with the calling subscriber to the position of System Reports oneself;
The base station, be connected with core net by base station controller, function is to receive the information of travelling carriage in the overlay area and send information to travelling carriage, its overlay area can be overlapping, when receiving the access apply for information of travelling carriage at the common uplink access channel, show that this travelling carriage is in the overlay area of oneself, travelling carriage replied that response message comprises the identity code and the load condition of base station;
Paging base station, link to each other with core net by base station controller, on paging channel travelling carriage is not carried out paging when the particular location of called mobile station is known by system, when system need be to intrasystem travelling carriage broadcast message, paging base station was born the work that sends broadcast message to travelling carriage.
The present invention proposes and be applicable to the initiatively access method of traveling carriage of mobile communication system of above-mentioned travelling carriage, make travelling carriage carry out active access there not being the base station to provide under the situation of beacon channel by this method.
Uplink random access channel among the present invention and base station responder link are in same frequency, time-division half-duplex work, to save frequency resource to greatest extent, satisfy the needs that travelling carriage inserts simultaneously again.In whole system, the quantity of Random Access Channel, frequency and other channel parameter are that system is predefined, so the travelling carriage in the system is known all Random Access Channel in advance.
When Mobile Origination is called out, at first scan all Random Access Channel, measure their noise level N successively, select the minimum Random Access Channel of noise level.At first on uplink random access channel frequency, the align inquiry burst of a minimum Pmin of power of time place's emission of travelling carriage with self clock, the inquiry burst comprises the identity information of travelling carriage itself, the base station should with the responder link of the identical frequency of above-mentioned uplink random access channel on travelling carriage responded one reply ACKB, if travelling carriage is not received the ACKB that replys of base station in certain time interval Δ T, the then inquiry burst of a power P min+ Δ P of the emission of the alignment travelling carriage clock place behind Δ T, if in certain time interval Δ T, do not receive the ACKB that replys of base station, the then inquiry burst of a power P min+2 Δ P of the emission of the alignment travelling carriage clock place behind Δ T is up to the ACKB that replys that receives the base station in time interval Δ T.The operable maximum power of travelling carriage emission inquiry burst is Pmax, and the Pmax maximum can be the maximum transmission power of travelling carriage.The frequency identical with the uplink random access channel used in replying of base station, launching with base station clock alignment place, reply that ACKB comprises the identity information of base station and to the control information of travelling carriage, control information comprises authentication, the encryption control of travelling carriage, and the indication travelling carriage forwards the Traffic Channel of base station assigns to when the beginning talk business.The base station happens suddenly by the travelling carriage inquiry that receives and adjusts the clock jitter of travelling carriage and the virtual synchronous unit of oneself, and travelling carriage is replied by the base station that receives and judged base station and the clock jitter of oneself.
In the travelling carriage active mobile communication system of the present invention, the concrete steps that insert when initiatively being made a call by travelling carriage comprise:
Step 1, travelling carriage scan all uplink random access channels, measure their noise level N, select the uplink random access channel of a minimum Nmin of noise level;
The place's emission inquiry burst of on uplink random access channel frequency, aliging of step 2, travelling carriage with self clock, the inquiry burst comprises the identity information of travelling carriage, Fa She inquiry burst power is Pmin first;
Step 3, travelling carriage in the later time interval delta T base stations detected reply ACKB;
Step 4 if travelling carriage receives the ACKB that replys of base station in time interval Δ T, then directly forwards step 10 to;
Step 5, if travelling carriage does not receive the ACKB that replys of base station in time interval Δ T, then increasing the inquiry burst transmissions power of setting is Pmin+ Δ P, and whether check Pmin+ Δ P less than Pmax, if check that then whether inquiry burst transmissions times N is less than the emission maximum times N max that allows, if, the place of then on uplink random access channel frequency, aliging with self clock, emission inquiry burst once more, the power of the inquiry burst of current emission is Pmin+ Δ P;
Step 6, travelling carriage in the later time interval delta T base stations detected reply ACKB;
Step 7 if travelling carriage receives the ACKB that replys of base station in time interval Δ T, then directly forwards step 10 to;
Step 8, if travelling carriage does not receive the ACKB that replys of base station in time interval Δ T, then increasing the inquiry burst transmissions power of setting is Pmin+2 Δ P, and whether check Pmin+2 Δ P less than Pmax, if check that then whether inquiry burst transmissions times N is less than the emission maximum times N max that allows, if, the place of then on uplink random access channel frequency, aliging with self clock, emission inquiry burst once more, the power of the inquiry burst of current emission is Pmin+2 Δ P;
Step 9, if travelling carriage does not receive the ACKB that replys of base station in ensuing time interval Δ T, then increase the inquiry burst transmissions power Δ P that sets, and the transmitting power after the inspection increase, whether less than Pmax, if, check that then whether inquiry burst transmissions times N is less than the emission maximum times N max that allows, if this process that increases power continues, and receives the ACKB that replys of base station in time interval Δ T up to travelling carriage always; If the inquiry burst transmissions power of setting reaches or greater than Pmax, then with Pmax power emission inquiry burst, up to the ACKB that replys that receives the base station in time interval Δ T, perhaps emitting times reaches Nmax, then think the uplink random access failure;
Step 10, base station are adjusted the clock jitter of the virtual synchronous unit of oneself according to the inquiry burst that receives;
Step 11, travelling carriage are replied ACKB receiving a plurality of base stations
1, ACKB
2, ACKB
3ACKB
NSituation under, select SIR or the best base station of BER;
Step 12 travelling carriage is replied the deviation of judgement self clock and base station clock according to the base station of selecting;
Step 13, the base station is carried out authentication according to the identity information in the travelling carriage inquiry burst to travelling carriage;
Control information during step 14, travelling carriage are replied according to the base station is registered, and transfers to the Traffic Channel of base station appointment, perform carry out can professional transmission preparation.
Travelling carriage of the present invention is initiatively in the mobile communication system, and the concrete steps that insert when initiating calling to travelling carriage by paging base station comprise:
Step 1, paging base station are sent the calling to travelling carriage;
Step 2, travelling carriage receive the beep-page message of paging base station to self, change state of activation over to;
Step 3, travelling carriage scan all uplink random access channels, measure their noise level N, select the uplink random access channel of a minimum Nmin of noise level;
The place's emission inquiry burst of on uplink random access channel frequency, aliging of step 4, travelling carriage with self clock, the inquiry burst comprises the identity information of travelling carriage, Fa She inquiry burst power is Pmin first;
Step 5, travelling carriage in the later time interval delta T base stations detected reply ACKB;
Step 6 if travelling carriage receives the ACKB that replys of base station in time interval Δ T, then directly forwards step 12 to;
Step 7, if travelling carriage does not receive the ACKB that replys of base station in time interval Δ T, then increasing the inquiry burst transmissions power of setting is Pmin+ Δ P, and whether check Pmin+ Δ P less than Pmax, if check that then whether inquiry burst transmissions times N is less than the emission maximum times N max that allows, if, the place of then on uplink random access channel frequency, aliging with self clock, emission inquiry burst once more, the power of the inquiry burst of current emission is Pmin+ Δ P;
Step 8, travelling carriage in the later time interval delta T base stations detected reply ACKB;
Step 9 if travelling carriage receives the ACKB that replys of base station in time interval Δ T, then directly forwards step 12 to;
Step 10, if travelling carriage does not receive the ACKB that replys of base station in time interval Δ T, then increasing the inquiry burst transmissions power of setting is Pmin+2 Δ P, and whether check Pmin+2 Δ P less than Pmax, if check that then whether inquiry burst transmissions times N is less than the emission maximum times N max that allows, if, the place of then on uplink random access channel frequency, aliging with self clock, emission inquiry burst once more, the power of the inquiry burst of current emission is Pmin+2 Δ P;
Step 11, if travelling carriage does not receive the ACKB that replys of base station in ensuing time interval Δ T, then increase the inquiry burst transmissions power Δ P that sets, and the transmitting power after the inspection increase, whether less than Pmax, if, check that then whether inquiry burst transmissions times N is less than the emission maximum times N max that allows, if this process that increases power continues, and receives the ACKB that replys of base station in time interval Δ T up to travelling carriage always; If the inquiry burst transmissions power of setting reaches or greater than Pmax, then with Pmax power emission inquiry burst, up to the ACKB that replys that receives the base station in time interval Δ T, perhaps emitting times reaches Nmax, then think the uplink random access failure;
Step 12, base station are adjusted the clock jitter of the virtual synchronous unit of oneself according to the inquiry burst that receives;
Step 13, travelling carriage are replied ACKB receiving a plurality of base stations
1, ACKB
2, ACKB
3ACKB
NSituation under, select SIR or the best base station of BER;
Step 14, travelling carriage are replied the deviation of judgement self clock and base station clock according to the base station of selecting;
Step 15, the base station is carried out authentication according to the identity information in the travelling carriage inquiry burst to travelling carriage;
Control information during step 16, travelling carriage are replied according to the base station is registered, and transfers to the Traffic Channel of base station appointment, perform carry out can professional transmission preparation.
In the above-mentioned access procedure, ACKB
1, ACKB
2, ACKB
3ACKB
NRepresent N base station replying to this travelling carriage.Adopt the initiatively access method of traveling carriage of mobile communication system of travelling carriage of the present invention, can make the utilance maximization of Random Access Channel, and can reduce the whole system noise, reach the purpose that the system uplink access channel is reasonable, optimize.
Description of drawings
Fig. 1 is the process schematic diagram of the travelling carriage emission Random Access Channel in the travelling carriage active mobile communication system of the present invention.
Embodiment
Describe access method of traveling carriage of the present invention in detail below in conjunction with Fig. 1.
Among Fig. 1, vertically representing by travelling carriage the uplink random of base station to be inserted signal to upward arrow in the square frame, vertically the downward arrow in the square frame is represented by the base station uplink random of travelling carriage emission to be inserted replying of signal.
When initiatively being made a call by travelling carriage, the concrete steps that travelling carriage inserts comprise:
1, travelling carriage scans all uplink random access channels, measures their noise level N, selects the uplink random access channel of a minimum Nmin of noise level;
2, the travelling carriage place's emission inquiry burst of on uplink random access channel frequency, aliging with self clock, the inquiry burst comprises the identity information of travelling carriage, Fa She inquiry burst power is Pmin first;
3, travelling carriage in the later time interval delta T base stations detected reply ACKB;
If 4 travelling carriages receive the ACKB that replys of base station in time interval Δ T, then directly forward step 10 to;
If 5 travelling carriages do not receive the ACKB that replys of base station in time interval Δ T, then increasing the inquiry burst transmissions power of setting is Pmin+ Δ P, and check that whether Pmin+ Δ P is less than Pmax, if, whether then check inquiry burst transmissions times N less than the emission maximum times N max that allows, if, the place of then on uplink random access channel frequency, aliging with self clock, emission inquiry burst once more, the power of the inquiry burst of current emission is Pmin+ Δ P;
6, travelling carriage in the later time interval delta T base stations detected reply ACKB;
If 7 travelling carriages receive the ACKB that replys of base station in time interval Δ T, then directly forward step 10 to;
If 8 travelling carriages do not receive the ACKB that replys of base station in time interval Δ T, then increasing the inquiry burst transmissions power of setting is Pmin+2 Δ P, and check that whether Pmin+2 Δ P is less than Pmax, if, whether then check inquiry burst transmissions times N less than the emission maximum times N max that allows, if, the place of then on uplink random access channel frequency, aliging with self clock, emission inquiry burst once more, the power of the inquiry burst of current emission is Pmin+2 Δ P;
If 9 travelling carriages do not receive the ACKB that replys of base station in ensuing time interval Δ T, then increase the inquiry burst transmissions power Δ P that sets, and the transmitting power after the inspection increase, whether less than Pmax, if, whether then check inquiry burst transmissions times N less than the emission maximum times N max that allows, if, this process that increases power continues always, receives the ACKB that replys of base station in time interval Δ T up to travelling carriage; If the inquiry burst transmissions power of setting reaches or greater than Pmax, then with Pmax power emission inquiry burst, up to the ACKB that replys that receives the base station in time interval Δ T, perhaps emitting times reaches Nmax, then think the uplink random access failure;
10, the clock jitter of the virtual synchronous unit of oneself is adjusted according to the inquiry burst that receives in the base station;
11, travelling carriage is replied ACKB receiving a plurality of base stations
1, ACKB
2, ACKB
3ACKB
NSituation under, select SIR or the best base station of BER;
12, travelling carriage is replied the deviation of judgement self clock and base station clock according to the base station of selecting;
13, the base station is carried out authentication according to the identity information in the travelling carriage inquiry burst to travelling carriage;
14, the control information during travelling carriage is replied according to the base station is registered, and is transferred to the Traffic Channel of base station appointment, perform carry out can professional transmission preparation.
When paging base station was initiated calling to travelling carriage, the concrete steps that travelling carriage inserts comprised:
1, paging base station sends the calling to travelling carriage;
2, travelling carriage receives the beep-page message of paging base station to self, changes state of activation over to;
3, travelling carriage scans all uplink random access channels, measures their noise level N, selects the uplink random access channel of a minimum Nmin of noise level;
4. the travelling carriage place's emission inquiry burst of on uplink random access channel frequency, aliging with self clock, the inquiry burst comprises the identity information of travelling carriage, Fa She inquiry burst power is Pmin first;
5, travelling carriage in the later time interval delta T base stations detected reply ACKB;
If 6 travelling carriages receive the ACKB that replys of base station in time interval Δ T, then directly forward step 12 to;
If 7 travelling carriages do not receive the ACKB that replys of base station in time interval Δ T, then increasing the inquiry burst transmissions power of setting is Pmin+ Δ P, and check that whether Pmin+ Δ P is less than Pmax, if, whether then check inquiry burst transmissions times N less than the emission maximum times N max that allows, if, the place of then on uplink random access channel frequency, aliging with self clock, emission inquiry burst once more, the power of the inquiry burst of current emission is Pmin+ Δ P;
8, travelling carriage in the later time interval delta T base stations detected reply ACKB;
If 9 travelling carriages receive the ACKB that replys of base station in time interval Δ T, then directly forward step 12 to;
If 10 travelling carriages do not receive the ACKB that replys of base station in time interval Δ T, then increasing the inquiry burst transmissions power of setting is Pmin+2 Δ P, and check that whether Pmin+2 Δ P is less than Pmax, if, whether then check inquiry burst transmissions times N less than the emission maximum times N max that allows, if, the place of then on uplink random access channel frequency, aliging with self clock, emission inquiry burst once more, the power of the inquiry burst of current emission is Pmin+2 Δ P;
If 11 travelling carriages do not receive the ACKB that replys of base station in ensuing time interval Δ T, then increase the inquiry burst transmissions power Δ P that sets, and the transmitting power after the inspection increase, whether less than Pmax, if, whether then check inquiry burst transmissions times N less than the emission maximum times N max that allows, if, this process that increases power continues always, receives the ACKB that replys of base station in time interval Δ T up to travelling carriage; If the inquiry burst transmissions power of setting reaches or greater than Pmax, then with Pmax power emission inquiry burst, up to the ACKB that replys that receives the base station in time interval Δ T, perhaps emitting times reaches Nmax, then think the uplink random access failure;
12, the clock jitter of the virtual synchronous unit of oneself is adjusted according to the inquiry burst that receives in the base station;
13, travelling carriage is replied ACKB receiving a plurality of base stations
1, ACKB
2, ACKB
3ACKB
NSituation under, select SIR or the best base station of BER;
14, travelling carriage is replied the deviation of judgement self clock and base station clock according to the base station of selecting;
15, the base station is carried out authentication according to the identity information in the travelling carriage inquiry burst to travelling carriage;
16, the control information during travelling carriage is replied according to the base station is registered, and is transferred to the Traffic Channel of base station appointment, perform carry out can professional transmission preparation.
In the access procedure under above-mentioned two kinds of situations, ACKB
1, ACKB
2, ACKB
3ACKB
NRepresent N base station replying to this travelling carriage.
Should be noted that all any improved methods that does not break away from inventive concept all belong to protection scope of the present invention, the concrete protection range of the present invention is defined by the claims.
Claims (3)
1. the travelling carriage access method of traveling carriage in the mobile communication system initiatively is characterized in that comprising:
Step 1, travelling carriage scan all uplink random access channels, measure their noise level N, select the uplink random access channel of a minimum Nmin of noise level;
The place's emission inquiry burst of on uplink random access channel frequency, aliging of step 2, travelling carriage with self clock, the inquiry burst comprises the identity information of travelling carriage, Fa She inquiry burst power is Pmin first;
Step 3, travelling carriage in the later time interval delta T base stations detected reply ACKB;
Step 4 if travelling carriage receives the ACKB that replys of base station in time interval Δ T, then directly forwards step 10 to;
Step 5, if travelling carriage does not receive the ACKB that replys of base station in time interval Δ T, then increasing the inquiry burst transmissions power of setting is Pmin+ Δ P, and whether check Pmin+ Δ P less than Pmax, if check that then whether inquiry burst transmissions times N is less than the emission maximum times N max that allows, if, the place of then on uplink random access channel frequency, aliging with self clock, emission inquiry burst once more, the power of the inquiry burst of current emission is Pmin+ Δ P;
Step 6, travelling carriage in the later time interval delta T base stations detected reply ACKB;
Step 7 if travelling carriage receives the ACKB that replys of base station in time interval Δ T, then directly forwards step 10 to;
Step 8, if travelling carriage does not receive the ACKB that replys of base station in time interval Δ T, then increasing the inquiry burst transmissions power of setting is Pmin+2 Δ P, and whether check Pmin+2 Δ P less than Pmax, if check that then whether inquiry burst transmissions times N is less than the emission maximum times N max that allows, if, the place of then on uplink random access channel frequency, aliging with self clock, emission inquiry burst once more, the power of the inquiry burst of current emission is Pmin+2 Δ P;
Step 9, if travelling carriage does not receive the ACKB that replys of base station in ensuing time interval Δ T, then increase the inquiry burst transmissions power Δ P that sets, and the transmitting power after the inspection increase, whether less than Pmax, if, check that then whether inquiry burst transmissions times N is less than the emission maximum times N max that allows, if this process that increases power continues, and receives the ACKB that replys of base station in time interval Δ T up to travelling carriage always; If the inquiry burst transmissions power of setting reaches or greater than Pmax, then with Pmax power emission inquiry burst, up to the ACKB that replys that receives the base station in time interval Δ T, perhaps emitting times reaches Nmax, then think the uplink random access failure;
Step 10, base station are adjusted the clock jitter of the virtual synchronous unit of oneself according to the inquiry burst that receives;
Step 11, travelling carriage are replied ACKB1, ACKB2, ACKB3 receiving a plurality of base stations ... under the situation of ACKBN, select SIR or the best base station of BER;
Step 12 travelling carriage is replied the deviation of judgement self clock and base station clock according to the base station of selecting;
Step 13, the base station is carried out authentication according to the identity information in the travelling carriage inquiry burst to travelling carriage;
Control information during step 14, travelling carriage are replied according to the base station is registered, and transfers to the Traffic Channel of base station appointment, perform carry out can professional transmission preparation.
2. the travelling carriage access method of traveling carriage in the mobile communication system initiatively is characterized in that comprising:
Step 1, paging base station are sent the calling to travelling carriage;
Step 2, travelling carriage receive the beep-page message of paging base station to self, change state of activation over to;
Step 3, travelling carriage scan all uplink random access channels, measure their noise level N, select the uplink random access channel of a minimum Nmin of noise level;
The place's emission inquiry burst of on uplink random access channel frequency, aliging of step 4, travelling carriage with self clock, the inquiry burst comprises the identity information of travelling carriage, Fa She inquiry burst power is Pmin first;
Step 5, travelling carriage in the later time interval delta T base stations detected reply ACKB;
Step 6 if travelling carriage receives the ACKB that replys of base station in time interval Δ T, then directly forwards step 12 to;
Step 7, if travelling carriage does not receive the ACKB that replys of base station in time interval Δ T, then increasing the inquiry burst transmissions power of setting is Pmin+ Δ P, and whether check Pmin+ Δ P less than Pmax, if check that then whether inquiry burst transmissions times N is less than the emission maximum times N max that allows, if, the place of then on uplink random access channel frequency, aliging with self clock, emission inquiry burst once more, the power of the inquiry burst of current emission is Pmin+ Δ P;
Step 8, travelling carriage in the later time interval delta T base stations detected reply ACKB;
Step 9 if travelling carriage receives the ACKB that replys of base station in time interval Δ T, then directly forwards step 12 to;
Step 10, if travelling carriage does not receive the ACKB that replys of base station in time interval Δ T, then increasing the inquiry burst transmissions power of setting is Pmin+2 Δ P, and whether check Pmin+2 Δ P less than Pmax, if check that then whether inquiry burst transmissions times N is less than the emission maximum times N max that allows, if, the place of then on uplink random access channel frequency, aliging with self clock, emission inquiry burst once more, the power of the inquiry burst of current emission is Pmin+2 Δ P;
Step 11, if travelling carriage does not receive the ACKB that replys of base station in ensuing time interval Δ T, then increase the inquiry burst transmissions power Δ P that sets, and the transmitting power after the inspection increase, whether less than Pmax, if, check that then whether inquiry burst transmissions times N is less than the emission maximum times N max that allows, if this process that increases power continues, and receives the ACKB that replys of base station in time interval Δ T up to travelling carriage always; If the inquiry burst transmissions power of setting reaches or greater than Pmax, then with Pmax power emission inquiry burst, up to the ACKB that replys that receives the base station in time interval Δ T, perhaps emitting times reaches Nmax, then think the uplink random access failure;
Step 12, base station are adjusted the clock jitter of the virtual synchronous unit of oneself according to the inquiry burst that receives;
Step 13, travelling carriage are replied ACKB1, ACKB2, ACKB3 receiving a plurality of base stations ... under the situation of ACKBN, select SIR or the best base station of BER;
Step 14, travelling carriage are replied the deviation of judgement self clock and base station clock according to the base station of selecting;
Step 15, the base station is carried out authentication according to the identity information in the travelling carriage inquiry burst to travelling carriage;
Control information during step 16, travelling carriage are replied according to the base station is registered, and transfers to the Traffic Channel of base station appointment, perform carry out can professional transmission preparation.
3. access method of traveling carriage according to claim 1 and 2 is characterized in that: described uplink random access channel and base station responder link are in same frequency, time-division half-duplex work.
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| CN1437415A (en) * | 2002-02-08 | 2003-08-20 | 华为技术有限公司 | Power control method of upstream control channel in soft switching state in high speed access system |
| CN1969484A (en) * | 2004-07-16 | 2007-05-23 | 三星电子株式会社 | Method and system for determining a power level for communication in a wireless network |
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