CN101478778B - Cellular communication system random access method and parameter transmission method - Google Patents
Cellular communication system random access method and parameter transmission method Download PDFInfo
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- CN101478778B CN101478778B CN200810000405XA CN200810000405A CN101478778B CN 101478778 B CN101478778 B CN 101478778B CN 200810000405X A CN200810000405X A CN 200810000405XA CN 200810000405 A CN200810000405 A CN 200810000405A CN 101478778 B CN101478778 B CN 101478778B
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Abstract
The invention discloses a random access method in honeycomb communication system and a method for parameter transmission, and belongs to a mobile communication system. In the random access method in honeycomb communication system, when a base station has a downstream data to send and a terminal is in a state of losing uplink synchronization, the terminal is required to starts the non-conflict random access process based on special-used random access fronting; when the non-conflict random access process based on special-used random access fronting fails, the terminal starts the conflicting random access based on public random access fronting. The invention discloses a random access parameter delivery method in honeycomb communication system. The invention raises the reliability of the restoring and sending of downstream data; simultaneously, the invention distributes the public random access fronting message through special message command, thus reducing the time cost by terminal reading system messages and fatherly reducing the time delay of the restoring and sending of the downstream data.
Description
Technical field
The invention belongs to mobile communcations system, the method that particularly a kind of cellular communication system random access method and parameter thereof are transmitted.
Background technology
As shown in Figure 1, cellular radio communication system is mainly by the terminal, and base station and core net are formed.The network that the base station is formed is called wireless access network (Radio Access Network is abbreviated as RAN), is responsible for the Access Layer affairs, such as the management of Radio Resource.Can there be physics or connection in logic according to actual conditions between the base station, such as the base station among Fig. 11 and base station 2 or base station 3.Each base station can connect with one or more than one core net node (Core Network is abbreviated as CN).Core net is responsible for the Non-Access Stratum affairs, such as position renewal etc., and is the anchor point of user plane.The terminal be meant can with the various device of cellular radio communication network communication, such as mobile phone or notebook computer etc.
In the existing LTE (long evolving system), the terminal and the base station between in the communication process, lose sometimes up synchronously.So-called up be meant synchronously base station and terminal know that all the up-link wireless signal arrives the propagation delay of base station receiver from the terminal.It is a lot of to lose synchronous reason, covers faint zone synchronizing process failure to such an extent as to arrived current area such as the terminal, and perhaps the terminal is in very long discontinuous receiving state of cycle or the like.The base station guarantees through Timing Alignment (time unifying) flow process whether both sides keep uplink synchronous that consistent understanding is arranged for the terminal with the terminal in the LTE system.
When the terminal lost uplink synchronous, if the base station has descending data to need to send, the base station at first need notify the terminal to initiate a random access procedure so, so as to obtain up synchronously, begin the data transmission procedure of recovering descending then.In general this random process is based on special-purpose leading conflict free random access procedure, comprises following three steps at least:
201: descending signaling is sent in the base station, and the notice terminal begins random access procedure.Comprise the special-purpose preface information of distributing to the terminal in the signaling;
202: random access guiding message is sent at the terminal on RACH;
203: accidental access response message is replied in the base station, comprises Timing Advance in the message at least.
In step 201, the base station can distribute an independent random access guiding to give the terminal.This random access guiding is that the base station keeps in advance, and that is to say can be through all terminals in the method notifying cell of broadcasting such as system message.In case and this random access guiding distributes to after certain terminal, above-mentioned flow process is not final finish before, this random access guiding can not distributed to other terminal, so in logic, this access lead is this terminal-specific.
In step 202, the random access guiding that use at the terminal is exactly in step 201, distribute special-purpose leading.The base station comes Direct Recognition to send the identity at the terminal of this message through the random access guiding in the identification step 201.Here it is adopts the largest benefit of special-purpose random access guiding, and promptly random access procedure does not conflict, thereby does not have extra time delay yet.This extra time delay is meant the time delay that introduce at the terminal after the random access procedure failure that conflict is arranged, comprise the stand-by period of new random access time slot and random access procedure again.In general, after certain random access procedure failure,, can resend random access guiding if the terminal wants to continue access procedure.And the distribution of random access time slot on time domain is discontinuous often, such as being separated by 10 milliseconds, so the terminal when initiating random access procedure again, needs the gap periods of the half the random access time slot of average waiting.In addition, than in higher, in order to reduce the conflict aggravation, the random access time slot of resend message often can be not continuous at cell load, and this has just increased the time delay that conflict causes more.
Certainly conflict free access process at random also can be failed sometimes.If let the terminal attempt initiating to insert at random always with this special-purpose access lead; Be inequitable for other-end so; Therefore should take adequate measures to let the terminal after the random access procedure failure; Can adopt adequate measures, so that can distribute to other-end to the random access guiding that has distributed.Present LTE system does not stipulate also in the process that downlink data recovers to send, if fail based on the random access procedure of special-purpose random access guiding, which type of measure the terminal should take.
After the random access procedure failure based on special-purpose random access guiding, the transmission of relevant Control Parameter also is very crucial in the measure that take at the terminal in addition.In general; This Control Parameter with insert relevant wireless parameter at random and in system message, broadcast; In the time of system message alteration, network can be notified the terminal that is in Radio Resource control connection (RRC_CONNECTED) state through the system update notification message.But this update notification message can be missed in the terminal that is in the RRC_CONNECTED state sometimes, because the terminal can be in the DRX pattern sometimes.The DRX pattern is meant that the terminal can periodically get into sleep state.Can receiving notice message at the sleep state terminal, can update system message yet.When the terminal lost uplink synchronous, system message often also can't upgrade in time.
Summary of the invention
Technical problem to be solved by this invention is, the method that a kind of cellular communication system random access method and parameter thereof are transmitted, and after not having the failure of conflict random access procedure, the transmission that recovers downlink data.
In order to solve the problems of the technologies described above; The present invention provides a kind of cellular communication system random access method; When having descending data, the base station needs to send; And think that the terminal is in the state that loses uplink synchronous, then can require the terminal to initiate nothing conflict random access procedure based on special-purpose random access guiding;
After said conflict free random access procedure failure based on special-purpose random access guiding, the access at random that conflict is arranged based on the public random access lead is initiated to the base station in the terminal.
Further, the information of above-mentioned public random access lead is that said terminal acquires to the downlink signaling of its transmission through system message or said base station.
Further, the information of above-mentioned public random access lead be the public random access lead number, or special-purpose random access guiding and public random access lead between boundary.
Further, the information of above-mentioned special-purpose random access guiding is that said base station sends to said terminal through downlink signaling, comprising the call number of special-purpose random access guiding.
Further, said method further comprises:
After the conflict free random access procedure failure based on special-purpose random access guiding, the terminal discharges said special-purpose random access guiding.
Further; Above-mentioned random access procedure failure based on special-purpose random access guiding is meant; Said special-purpose random access guiding message is sent to the base station in said terminal on RACH number of times reaches maximum and allows number of times, and does not all receive correct accidental access response message.
The invention also discloses the method that a kind of cellular communication system random access parameter transmits, may further comprise the steps:
After the downlink signaling that carries special-purpose random access guiding and public random access lead information that sends the base station is received at the terminal, initiate random access procedure based on said special-purpose random access guiding to the base station; If the random access procedure failure based on special-purpose random access guiding that initiate at said terminal is then initiated the random access procedure based on said public random access lead to said base station.
Further, the above-mentioned public random access lead information number that is the public random access lead, or special-purpose random access guiding and public random access lead between boundary.
Further, said method further comprises:
When said random access procedure based on special-purpose random access guiding was failed, said terminal discharged said special-purpose random access guiding.
Further; Above-mentioned random access procedure failure based on special-purpose random access guiding refers to; Said special-purpose random access guiding message is sent to the base station in said terminal on RACH number of times reaches maximum and allows number of times, and does not all receive correct accidental access response message.
The present invention initiates to help improving the reliability that downlink data recovers transmission based on the random access procedure of public random access lead after conflict free random access procedure failure again.In addition, the present invention distributes to the public random access lead information at terminal through dedicated signaling, can reduce the time of terminal read system message, recovers the time delay of sending thereby reduce downlink data.Simultaneously, the present invention in time discharges the special-purpose random access guiding that is assigned to the terminal after conflict free access failure at random, help keeping the fairness of resource allocation.
Description of drawings
Fig. 1 is existing cellular radio communication system structural representation;
Fig. 2 is the conflict free figure of access process at random based on special-purpose random access guiding;
Fig. 3 is that the embodiment of the invention 1 realizes the flow chart of access at random;
Fig. 4 is that the embodiment of the invention 2 realizes random access parameter conveying flow figure.
Embodiment
Main design of the present invention is; When the terminal that is in the RRC_CONNECTED state loses synchronously; And network side is when need recover downlink data and send; Base station under the terminal can be sent a downlink signaling to it and required this terminal to initiate the conflict free random access procedure based on special-purpose random access guiding; After this conflict free random access procedure failure is initiated at the terminal; The random access procedure that conflict is arranged based on the public random access lead can be continued to initiate in the terminal, and wherein public random access lead information comes from the signaling of the terminal initiation of base station requirement originally based on the random access procedure of special-purpose random access guiding, in the system message that perhaps send the base station.
Further; Consider that the downlink signaling that send to the terminal base station is a dedicated signaling; Can transmit other access control parameters at random; Therefore the present invention has carried public random access lead information in this dedicated signaling, and wherein public random access lead information can be the number of public random access lead or the boundary between special-purpose random access guiding and the public random access lead.
Wherein, the failure of said random access procedure based on special-purpose random access guiding information is meant the later failure of retransmission process of having passed through the media access control MAC layer.
That is to say; For the terminal; Failure based on the random access procedure of special-purpose random access guiding information refers to, said special-purpose random access guiding message is sent to the base station in the terminal on RACH number of times reaches maximum and allows number of times, and does not all receive correct accidental access response message; At this moment, the terminal initiatively discharges described special-purpose random access guiding;
For the base station; Failure based on the random access procedure of special-purpose random access guiding information refers to; (base station realizes that through starting a timer this time limits in random access procedure) be not when all receiving the uplink synchronous acknowledge message of returning at the terminal in prior official hour interval); At this moment, the base station discharges described special-purpose random access guiding, that is to say that the base station can be the terminal use of this special-purpose random access guiding information distribution to other.
The terminal need not obtain up-to-date random access parameter through the content of read system message before the random access procedure of initiating based on public random access guiding, comprise public random access guiding information.
Below in conjunction with accompanying drawing and embodiment, technical scheme of the present invention is done further explain.
Embodiment 1:
If certain terminal is in the state of RRC_CONNECTED because certain reason lost up synchronously.In this time, descending data need be sent in the base station, so initiated one based on the leading conflict free random access procedure of special use, suppose that the maximum permission number of times that random access guiding sends is 3 times, and this random access procedure is as shown in Figure 3, may further comprise the steps:
301: descending signaling is sent in the base station, and the notice terminal begins random access procedure, wherein comprises the special-purpose random access guiding information of distributing to the terminal in the downlink signaling, for example a leading call number n and other physical layer parameters;
302: said random access guiding message (302a) is sent to the base station in the terminal on RACH; But correct accidental access response message (302b) is not received at the receive window of stipulating in advance in the terminal in the time, so the terminal decision resends random access guiding message to the base station on RACH;
303: said random access guiding message (303a) is sent to the base station in the terminal on RACH; But correct accidental access response message (303b) is not received at the receive window of stipulating in advance in the terminal in the time, so the terminal decision resends random access guiding message to the base station on RACH;
304: said random access guiding message (304a) is sent to the base station in the terminal on RACH; But correct accidental access response message (304b) is not received at the receive window of stipulating in advance in the terminal in the time; Reached the terminal this moment and sent the maximum permission transmission number of times of random access guiding message, so the random access procedure based on special-purpose random access guiding is abandoned at the terminal;
In this step, after the random access procedure based on special-purpose random access guiding is abandoned at the terminal, initiatively discharge described special-purpose random access guiding; And as far as the base station; Failure based on the random access procedure of special-purpose random access guiding information; Just its in prior official hour interval (base station realizes that through starting a timer this time limits in random access procedure) all do not received the uplink synchronous acknowledge message of returning at the terminal; At this moment, the base station discharges described special-purpose random access guiding, that is to say that the base station can be the terminal use of this special-purpose random access guiding information distribution to other.
In the above-mentioned steps 302 to 304, the terminal does not receive that the reason of accidental access response possibly be the incorrect random access guiding message that receives in base station, possibly be not have correctly to receive the accidental access response message itself that send the base station yet.
305: the terminal begins to send the random access guiding message based on the public random access lead, and beginning is based on the random access procedure of conflict.
In this step; The said same prior art of random access procedure based on conflict; Wherein, Public random access lead information can be the number of public random access lead or the boundary between special-purpose random access guiding and the public random access lead, and the terminal can obtain this preface information to the downlink signaling of its transmission through system message (like broadcast) or base station.
Embodiment 2:
If certain terminal is in the state of RRC_CONNECTED because certain reason lost up synchronously.This time; Descending data need be sent in the base station, so initiated one based on the leading conflict free random access procedure of special use, suppose that the maximum permission number of times that random access guiding sends is 3 times; This moment, the transmittance process of random access parameter was as shown in Figure 4, may further comprise the steps:
401: descending signaling is sent in the base station; The notice terminal begins random access procedure, wherein comprises special-purpose random access guiding information (for example leading call number n), other physical layer parameters and the public random access lead information of distributing to the terminal in the downlink signaling;
In this step, public random access lead information can be the number of public random access lead or the boundary between special-purpose random access guiding and the public random access lead.
402: special-purpose random access guiding message (402a) is sent to the base station in the terminal on RACH; But correct accidental access response message (402b) is not received at the receive window of stipulating in advance in the terminal in the time, so the terminal decision resends special-purpose random access guiding message to the base station on RACH;
403: special-purpose random access guiding message (403a) is sent to the base station in the terminal on RACH; But correct accidental access response message (403b) is not received at the receive window of stipulating in advance in the terminal in the time, so the terminal decision resends special-purpose random access guiding message to the base station on RACH;
404: special-purpose random access guiding message (404a) is sent to the base station in the terminal on RACH; But correct accidental access response message (404b) is not received at the receive window of stipulating in advance in the terminal in the time; Reached the maximum of sending random access guiding message to the base station in the terminal this moment and allowed to send number of times, so the random access procedure based on special-purpose random access guiding is abandoned at the terminal;
In this step, after the random access procedure based on special-purpose random access guiding is abandoned at the terminal, initiatively discharge described special-purpose random access guiding; And as far as the base station; Failure based on the random access procedure of special-purpose random access guiding information; Just its in prior official hour interval (base station realizes that through starting a timer this time limits in random access procedure) all do not received the uplink synchronous acknowledge message of returning at the terminal; At this moment, the base station discharges described special-purpose random access guiding, that is to say that the base station can be the terminal use of this special-purpose random access guiding information distribution to other.
405: the terminal begins to send the random access guiding message based on said public random access lead, and beginning is based on the random access procedure of conflict.
In this step, the said same prior art of random access procedure based on conflict.
Can find out that from the foregoing description the present invention initiates to help improving the reliability that downlink data recovers transmission based on the random access procedure of public random access lead again after conflict free random access procedure failure.In addition, the present invention distributes to the public random access lead information at terminal through dedicated signaling, can reduce the time of terminal read system message, recovers the time delay of sending thereby reduce downlink data; Simultaneously, the present invention in time discharges the special-purpose random access guiding that is assigned to the terminal after conflict free access failure at random, help keeping the fairness of resource allocation.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. cellular communication system random access method is characterized in that:
Need to send when there are descending data the base station, and think that the terminal is in the state that loses uplink synchronous, then require the terminal to initiate nothing conflict random access procedure based on special-purpose random access guiding;
After said conflict free random access procedure failure based on special-purpose random access guiding, the access at random that conflict is arranged based on the public random access lead is initiated to the base station in the terminal.
2. the method for claim 1 is characterized in that,
The information of said public random access lead is that said terminal acquires to the downlink signaling of its transmission through system message or said base station.
3. method as claimed in claim 2 is characterized in that,
The information of said public random access lead be the public random access lead number, or special-purpose random access guiding and public random access lead between boundary.
4. method as claimed in claim 2 is characterized in that,
The information of said special-purpose random access guiding is that said base station sends to said terminal through downlink signaling, comprising the call number of special-purpose random access guiding.
5. the method for claim 1 is characterized in that, said method further comprises:
After the conflict free random access procedure failure based on special-purpose random access guiding, the terminal discharges said special-purpose random access guiding.
6. like claim 1 or 5 described methods, it is characterized in that,
Said random access procedure failure based on special-purpose random access guiding is meant; Said special-purpose random access guiding message is sent to the base station in said terminal on RACH number of times reaches maximum and allows number of times, and does not all receive correct accidental access response message.
7. the method that the cellular communication system random access parameter transmits is characterized in that, may further comprise the steps:
After the downlink signaling that carries special-purpose random access guiding and public random access lead information that sends the base station is received at the terminal, initiate random access procedure based on said special-purpose random access guiding to the base station; If the random access procedure failure based on special-purpose random access guiding that initiate at said terminal is then initiated the random access procedure based on said public random access lead to said base station.
8. method as claimed in claim 7 is characterized in that,
The number that said public random access lead information is the public random access lead, or special-purpose random access guiding and public random access lead between boundary.
9. method as claimed in claim 7 is characterized in that, said method further comprises:
When said random access procedure based on special-purpose random access guiding was failed, said terminal discharged said special-purpose random access guiding.
10. like claim 7 or 9 described methods, it is characterized in that,
Said random access procedure failure based on special-purpose random access guiding refers to; Said special-purpose random access guiding message is sent to the base station in said terminal on RACH number of times reaches maximum and allows number of times, and does not all receive correct accidental access response message.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101772180A (en) * | 2008-12-31 | 2010-07-07 | 中兴通讯股份有限公司 | Random access method and system |
| CN102056297B (en) * | 2009-11-02 | 2013-11-06 | 电信科学技术研究院 | Random access method and equipment in multi-carrier system |
| CN102196590B (en) * | 2010-03-18 | 2014-10-29 | 电信科学技术研究院 | Method and equipment for judging radio link failure |
| CN103260251B (en) | 2012-02-17 | 2016-06-15 | 华为技术有限公司 | Data transmission method, base station and subscriber equipment |
| CN112087814B (en) * | 2016-12-26 | 2022-10-28 | Oppo广东移动通信有限公司 | Random access method and device |
| CN108391319B (en) * | 2017-02-03 | 2023-05-16 | 华为技术有限公司 | Method and device for transmitting random access preamble |
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