CN101478780A - Method for random access in cellular communication system - Google Patents
Method for random access in cellular communication system Download PDFInfo
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- CN101478780A CN101478780A CNA2008100028088A CN200810002808A CN101478780A CN 101478780 A CN101478780 A CN 101478780A CN A2008100028088 A CNA2008100028088 A CN A2008100028088A CN 200810002808 A CN200810002808 A CN 200810002808A CN 101478780 A CN101478780 A CN 101478780A
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Abstract
The invention discloses a random access method in honeycomb communication system and is used for ensuring uplink synchronization in the process of a terminal starting random access without conflicts when a base station in honeycomb communication system restores the downstream data sending. In the random access process, the random access responding message of the base station responding to the terminal at least comprises time advance and the authorization message sent to the base station from uplink wireless resource; then the terminal receives the random access responding message and sends a confirmation message to the base station through the uplink wireless resource. The invention also provides a clear management strategy to the special random access fronting in the random access process. The invention ensures that the base station can correctly know whether the terminal receives the synchronous message and ensures the smooth operation of sending downstream data; simultaneously, owing that the special random access fronting has a clear management strategy, thus effectively saving resource and avoiding the divergence between the terminal and the special-used fronting.
Description
Technical field
The present invention relates to the access technology in the mobile communication system, relate in particular to the method that inserts at random in a kind of cellular communication system.
Background technology
As shown in Figure 1, cellular radio communication system mainly is made up of terminal, base station and core net.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's face.Terminal be meant can with the various device of cellular radio communication network communication, such as mobile phone or notebook computer etc.
In existing LTE (long evolving system) system, terminal and the base station between carry out 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 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 terminal, and perhaps terminal is in very long discontinuous receiving state of cycle or the like.The base station guarantees by TimingAlignment (time unifying) flow process whether both sides keep uplink synchronous that consistent understanding is arranged for terminal with terminal in the LTE system.
When terminal lost uplink synchronous, if the base station has descending data to need to send, the base station at first needed to notify 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, as shown in Figure 2, comprises following three steps at least:
201: the base station sends descending signaling, and the notice terminal begins random access procedure.Comprise the special-purpose preface information of distributing to terminal in the signaling;
202: terminal sends random access guiding message on Random Access Channel;
203: accidental access response message is replied in the base station, comprises Timing Advance in the message at least;
In step 202, the random access guiding that terminal is used is exactly to give the special-purpose leading of terminal by base station assigns in step 201.The identity of the terminal that sends this message is discerned in the base station by the random access guiding in the identification step 202.
In step 203, the Timing Advance in the accidental access response message is used for the parameter of initialization terminal uplink synchronous exactly.If terminal does not obtain up-to-date Timing Advance information, the signal of its transmission can not correctly be received by the base station probably so, thereby causes Communications failure.The terminal wait accidental access response message has the restriction of a time period in addition, and this time period is called the time of reception window.Terminal is only correctly received accidental access response message in the time of reception window after, can think that just step 203 finishes.
If all steps are all normally carried out, the process of transmitting of downlink data just can be recovered in the base station.But when step 203 generation was unusual, follow-up communication process can be failed.Step 203 is meant that unusually the base station has sent accidental access response message, but the medium Access Layer MAC of terminal does not but receive this message, its reason may be that terminal does not receive that this message or physical layer have been received this message but because signal to noise ratio is too low can't correctly be handled, such as demodulation failure or CRC check failure etc.
The accidental access response message that the base station sends is the control signaling of a MAC layer, and this signaling has adopted the processing procedure that is different from normal HARQ in physical layer, does not promptly confirm/deny the HARQ process of message.In the normal HARQ process, whether the recipient will correctly receive feedback acknowledgment or deny message after receiving wireless signal according to data.In prior art shown in Figure 2, whether this message sends success from the angle of base station, still is that the MAC layer all can't be known from physical layer.So sent out after this accidental access response message when the base station, can think that the uplink synchronous of terminal is successful; But the MAC layer of terminal is not because receive this message, the up desynchronizing state that also is in.Like this when base station when beginning to send descending data, even terminal can correctly receive packet, but because it receives the affirmation that the back sends HARQ/deny that message possibly can't correctly be received by the base station, thereby also can cause the failure of subsequent communications.
The another one problem is the success of this random access procedure can discharge and distribute to this terminal special-purpose random access guiding of (being called for short terminal A) so very naturally if the base station after having sent accidental access response message, is just thought.If the base station is very fast this random access guiding has been distributed to other-end, used such as terminal B.If but terminal A does not receive this accidental access response message, terminal A adopts this special-purpose random access guiding to initiate again to insert at random possibly again, because this special-purpose access lead has been distributed to terminal B, so the random access guiding message of two terminal transmissions may produce conflict, for these two terminals, random access procedure in fact no longer has been conflict free process.And for the base station, may be wrong as terminal B terminal A, thus cause the random access procedure of terminal A and terminal B to be failed.
Summary of the invention
Technical problem to be solved by this invention is, the method that inserts at random in a kind of cellular communication system is provided, and realizes with connecing access procedure and guaranteeing the uplink synchronous between the terminal and base station in the random access procedure.
The invention provides in a kind of cellular communication system the method that inserts at random, terminal is obtained the process of uplink synchronous when being applied to need to recover downlink data in the base station and sending, and comprises the steps:
After terminal was carried the downlink signaling of special-purpose random access guiding information from the base station reception, the beginning random access procedure adopted the leading transmission random access guiding of described special use message to the base station on Random Access Channel;
Described base station comprises the authorization message of Timing Advance and ascending wireless resource at least to the terminal responds accidental access response message in this accidental access response message; Described terminal receiving random access response message also utilizes described ascending wireless resource wherein to send the affirmation signaling to the base station.
Described method further comprises:
Described base station also starts a protection timer Tdp random access procedure is carried out timing when the downlink signaling of special-purpose random access guiding information is carried in the terminal transmission.
Described method further comprises:
Described terminal discharges special-purpose random access guiding send the success of described acknowledge message affirmation uplink synchronous to the base station after.
Described method further comprises:
Described terminal is abandoned the random access procedure based on special-purpose random access guiding after the uplink synchronous failure based on special-purpose random access guiding, discharge special-purpose random access guiding.Described uplink synchronous failure is meant: described terminal does not receive that the repeating transmission number of times of correct accidental access response message and special-purpose random access guiding reaches the predefined maximum number of times that allows.
Described method further comprises:
The special-purpose random access guiding of distributing to described terminal is reclaimed in described base station behind the up affirmation signaling of receiving terminal or predefined protection timer expiry.
Described ascending wireless resource comprises that the base station licenses to the up time domain and/or the frequency domain Radio Resource of terminal.
The control signaling that described affirmation signaling is the media access control MAC layer.The mode that described affirmation signaling employing mixed automatic retransmission is HARQ sends.
The present invention also provides the method that inserts at random in a kind of cellular communication system, in the time of need recovering the downlink data transmission in the base station, comprises the steps:
To the special-purpose random access guiding of terminal distribution, described terminal initiates to insert at random request based on described special-purpose random access guiding to described base station by downlink signaling in the base station;
The authorization message of Timing Advance and ascending wireless resource is carried at least to the accidental access response message of terminal responds in the base station in this response message; Described terminal utilizes described ascending wireless resource to send up affirmation signaling to the base station after successfully receiving described Timing Advance;
Described terminal discharges special-purpose random access guiding after sending described up affirmation signaling;
The special-purpose random access guiding of distributing to described terminal is reclaimed in described base station behind the up affirmation signaling of receiving terminal or described protection timer expiry, the random access guiding that this is special-purpose is redistributed.Described recovery is meant that described special-purpose random access guiding becomes the resource of sub-distribution again.
Described method further comprises:
Described terminal is after the uplink synchronous failure based on special-purpose random access guiding, be after described terminal does not receive that the repeating transmission number of times of correct accidental access response message and special-purpose random access guiding reaches predefined maximum permission number of times, abandon random access procedure, discharge special-purpose random access guiding based on special-purpose random access guiding.
Utilize accidental access method of the present invention, lose if the base station sends to the accidental access response message of terminal, terminal can be because do not receive accidental access response message so, and think own uplink synchronous failure, thereby stop to send confirmation of synchronization message; And the base station also can be because of not receiving described confirmation of synchronization message, and think that terminal does not also obtain uplink synchronous.Terminal will be consistent for the judgement of uplink synchronous with the base station like this, avoided follow-up Communications failure.
Further, if the confirmation of synchronization information drop-out that terminal sends, terminal can be thought and obtained uplink synchronous so, but the base station can not think that because of receiving this acknowledge message terminal does not also obtain uplink synchronous.But in the recovery process because of downlink data, follow-up data transmission procedure can not continued in the base station, and for terminal, because can not further obtain the mandate of ascending resource from the base station, if send any message and data, then also need to initiate again random access procedure.
The present invention is directed in the prior art special-purpose random access guiding in the random access procedure in addition and do not have the problem of respective resources management strategy, also the management strategy to special-purpose random access guiding in the random access procedure is carried out clear and definite definition, can prevent from difference to occur between terminal and the base station, simultaneously can make full use of resource, avoid leading being taken in vain and cause the wasting of resources.
Description of drawings
Fig. 1 is the structural representation of existing cellular radio communication system;
Fig. 2 is based on the leading conflict free random access procedure schematic diagram of special use in the prior art;
Fig. 3 is the nothing conflict random access procedure schematic diagram based on special-purpose random access guiding that the present invention has improved;
Fig. 4 is based on the nothing of special-purpose random access guiding conflict random access procedure schematic diagram in the embodiment of the invention 1;
Fig. 5 is based on the nothing of special-purpose random access guiding conflict random access procedure schematic diagram in the embodiment of the invention 2;
Fig. 6 is based on the nothing of special-purpose random access guiding conflict random access procedure schematic diagram in the embodiment of the invention 3.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Accidental access method of the present invention mainly is when the downlink data transmission need be recovered in the base station in cellular communication system, guarantees a kind of accidental access method of uplink synchronous in the random access procedure that requires terminal to initiate not have to conflict.In prior art; can't guarantee that the base station can learn accurately whether terminal correctly receives the problem of synchronizing information; whether correctly having proposed a kind of is the terminal distribution ascending resource by the base station, and utilized the uplink authorization resource of base station assigns to report confirmation of synchronization message, informed the base station accidental access method of receiving synchronous information by terminal.
At above-mentioned technical problem of the prior art, the present invention has improved the nothing conflict random access procedure based on special-purpose random access guiding, as shown in Figure 3, comprises the steps:
301: the base station sends descending signaling, and the notice terminal begins random access procedure, comprises the special-purpose random access guiding information of distributing to terminal in the described downlink signaling; Described special-purpose random access guiding information comprises leading call number;
302: terminal adopts the special-purpose random access guiding that distributes to send random access guiding message to the base station on Random Access Channel;
303: the base station comprises the authorization message of Timing Advance and ascending wireless resource at least to the terminal responds accidental access response message in this accidental access response message; Wherein, described ascending wireless resource comprises up time domain and/or frequency domain Radio Resource;
304: send on the ascending wireless resource that terminal is distributed in the base station and confirm signaling, acknowledged receipt of Timing Advance information.Described affirmation signaling in this step can be the confirmation of synchronization signaling, also or other can inform that base station terminal has successfully received the signaling of Timing Advance.
Wherein, described downlink signaling can be the random access guiding assignment messages, is used to send the downlink data of arrival; Described downlink signaling is a switching command, is used for the requirement terminal and switches to Target cell from the cell-of-origin; If described downlink signaling is a switching command, then described confirmation of synchronization signaling then should be handoff completion message mutually.
Compared with prior art, the present invention is in the step 303 of the random access procedure that conflicts based on the nothing of special-purpose random access guiding, increased the configuration of ascending wireless resource, so that terminal can be utilized the confirmation of synchronization message of described ascending wireless resource forwarding step 304, the affirmation terminal has been received Timing Advance information to the base station, and just terminal has obtained uplink synchronous.
Further, in conjunction with above-mentioned access process at random shown in Figure 3, the present invention also provides the tactful mode that is used to manage special-purpose random access guiding, that is:
At first, the base station distributes the random access guiding of 1 special use to give terminal in the downlink signaling of step 301; The back described special-purpose random access guiding of release is in time being inserted successfully or failed in described then terminal or base station at random.Particularly:
(1) terminal will discharge special-purpose random access guiding under following condition:
After the network side at place, base station has been confirmed uplink synchronous or after the uplink synchronous failure based on special-purpose random access guiding, abandon random access procedure, discharge special-purpose random access guiding based on special-purpose random access guiding;
For terminal, " uplink synchronous failure " typically refers to terminal and do not receive that the repeating transmission number of times of correct accidental access response message and special-purpose random access guiding arrives the predefined maximum number of times that allows.
(2) the special-purpose random access guiding that distributes will be reclaimed in the base station under following condition:
After receiving the uplink synchronous acknowledge message or predefined protection timer expiry of terminal, reclaim the special-purpose random access guiding of distributing to this terminal.
For the base station, the meaning of " recovery " is meant that the base station can redistribute by the random access guiding that this is special-purpose again, and random access guiding that for example should special use is distributed to other terminal and used.
Utilize the method that inserts at random of the present invention, if the accidental access response message of above-mentioned steps 303 is lost, terminal can be because do not receive accidental access response message so, and think own uplink synchronous failure, thereby stop the affirmation message of forwarding step 304; And the base station also can be because of the affirmation message of not receiving step 304, and think that terminal does not also obtain uplink synchronous.Terminal will be consistent for the judgement of uplink synchronous with the base station like this, avoids follow-up Communications failure.
Further, if the confirmation of synchronization information drop-out that terminal sends in step 304, terminal can be thought and obtained uplink synchronous so, but the base station can not think that because of receiving this acknowledge message terminal does not also obtain uplink synchronous.But this relation is little, because the recovery process of this downlink data, follow-up data transmission procedure can not continued equally in the base station.And,,, then also need to initiate again random access procedure if send any message and data because there is not the mandate of further ascending resource for terminal.The present invention manages for special-purpose random access guiding and carries out clear and definite definition in addition, can prevent from difference to occur between terminal and the base station.
Next provided at several concrete conditions in the downlink data recovery process and provided 3 specific embodiments using uplink synchronisation method of the present invention.
Embodiment 1: successful downlink data recovery process.
If certain terminal is in the connection status of RRC_CONNECTED because certain reason lost up synchronously.At this moment, the base station need send descending data, so initiated one based on the leading conflict free random access procedure of special use, as shown in Figure 4:
401: the base station sends descending signaling, and the notice terminal begins random access procedure, comprises the special-purpose preface information of distributing to terminal in the signaling, such as a leading call number n; The base station also can be provided with a protection timer Tdp simultaneously;
402: terminal sends random access guiding message on Random Access Channel, employing be the access lead that distributes in the step 401.
403: the base station comprises the authorization message of Timing Advance TA and ascending wireless resource to the terminal responds accidental access response message in this accidental access response message;
404: terminal has been received accidental access response at the time of reception window, sends the control signaling of a media access control MAC layer then on the ascending wireless resource that distributes, and has acknowledged receipt of Timing Advance TA.Terminal can discharge special-purpose random access guiding simultaneously.
405: the base station is received and is reclaimed special-purpose random access guiding, and stop Tdp after the affirmation signaling of terminal transmission.
Embodiment 2: the downlink data recovery process of failure: lose accidental access response message.
If certain terminal is in the connection status of RRC_CONNECTED because certain reason lost up synchronously.At this moment, the base station need send descending data, so initiated one based on the leading conflict free random access procedure of special use, as shown in Figure 5:
501: the base station sends descending signaling, and the notice terminal begins random access procedure, comprises the special-purpose preface information of distributing to terminal in the signaling, such as a leading call number n; The base station is provided with a protection timer Tdp simultaneously;
502: terminal sends random access guiding message on Random Access Channel, employing be the access lead that distributes in the step 501;
503: the base station has comprised the authorization message of Timing Advance TA and ascending wireless resource to the terminal responds accidental access response message in this accidental access response message;
504: terminal is not received described accidental access response message at the time of reception window, and then terminal decides and retransmits random access guiding message or stop random access procedure according to the situation of the random access procedure of the configuration of network and record; If stop, discharging special-purpose random access guiding so simultaneously;
505: the base station does not temporarily send downlink data because do not receive the affirmation signaling of terminal; After Tdp is overtime, reclaim special-purpose random access guiding.
Embodiment 3: the downlink data recovery process of failure: the confirmation of synchronization message of losing terminal.
If certain terminal is in the connection status of RRC_CONNECTED because certain reason lost up synchronously.At this moment, the base station need send descending data, so initiated one based on the leading conflict free random access procedure of special use, as shown in Figure 6:
601: the base station sends descending signaling, and the notice terminal begins random access procedure, comprises the special-purpose preface information of distributing to terminal in the signaling, such as a leading call number n; The base station is provided with a protection timer Tdp simultaneously;
602: terminal sends random access guiding message on Random Access Channel, employing be the access lead that distributes in the step 601;
603: the base station has comprised the authorization message of Timing Advance TA and ascending wireless resource to the terminal responds accidental access response message in this accidental access response message;
604: terminal has been received described accidental access response message at the time of reception window, sends the control signaling of a media access control MAC layer then on the ascending wireless resource that distributes, and has acknowledged receipt of Timing Advance TA; Terminal discharges special-purpose random access guiding;
605: the MAC layer of base station is not received the affirmation message of terminal, reclaims random access guiding after timer Tdp is overtime.
Described herein is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Therefore, all any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improve and upgrade or the like, all should be included within protection scope of the present invention.
Claims (12)
1, the method that inserts at random in a kind of cellular communication system, terminal is obtained the process of uplink synchronous when being applied to need to recover downlink data in the base station and sending, and it is characterized in that, comprises the steps:
After terminal was carried the downlink signaling of special-purpose random access guiding information from the base station reception, the beginning random access procedure adopted the leading transmission random access guiding of described special use message to the base station on Random Access Channel;
Described base station comprises the authorization message of Timing Advance and ascending wireless resource at least to the terminal responds accidental access response message in this accidental access response message; Described terminal receiving random access response message also utilizes described ascending wireless resource wherein to send the affirmation signaling to the base station.
2, the method for claim 1 is characterized in that, described method further comprises:
Described base station also starts a protection timer Tdp random access procedure is carried out timing when the downlink signaling of special-purpose random access guiding information is carried in the terminal transmission.
3, the method for claim 1 is characterized in that, described method further comprises:
Described terminal discharges special-purpose random access guiding send the success of described acknowledge message affirmation uplink synchronous to the base station after.
4, the method for claim 1 is characterized in that, described method further comprises:
Described terminal is abandoned the random access procedure based on special-purpose random access guiding after the uplink synchronous failure based on special-purpose random access guiding, discharge special-purpose random access guiding.
5, method as claimed in claim 4 is characterized in that, described uplink synchronous failure is meant:
Described terminal does not receive that the repeating transmission number of times of correct accidental access response message and special-purpose random access guiding reaches the predefined maximum number of times that allows.
6, method as claimed in claim 2 is characterized in that, described method further comprises:
The special-purpose random access guiding of distributing to described terminal is reclaimed in described base station behind the up affirmation signaling of receiving terminal or predefined protection timer expiry.
7, the method for claim 1 is characterized in that, described ascending wireless resource comprises that the base station licenses to the up time domain and/or the frequency domain Radio Resource of terminal.
8, the method for claim 1 is characterized in that, the control signaling that described affirmation signaling is the media access control MAC layer.
9, the method for claim 1 is characterized in that, the mode that described affirmation signaling employing mixed automatic retransmission is HARQ sends.
10, the method that inserts at random in a kind of cellular communication system is characterized in that, in the time of need recovering the downlink data transmission in the base station, comprises the steps:
To the special-purpose random access guiding of terminal distribution, described terminal initiates to insert at random request based on described special-purpose random access guiding to described base station by downlink signaling in the base station;
The authorization message of Timing Advance and ascending wireless resource is carried at least to the accidental access response message of terminal responds in the base station in this response message; Described terminal utilizes described ascending wireless resource to send up affirmation signaling to the base station after successfully receiving described Timing Advance;
Described terminal discharges special-purpose random access guiding after sending described up affirmation signaling or after confirming the uplink synchronous failure;
The special-purpose random access guiding of distributing to described terminal is reclaimed in described base station behind the up affirmation signaling of receiving terminal or described protection timer expiry.
11, method as claimed in claim 10 is characterized in that,
Described recovery is meant that described special-purpose random access guiding becomes the resource of sub-distribution again.
12, method as claimed in claim 10 is characterized in that,
The failure of described uplink synchronous is meant that described terminal do not receive that the repeating transmission number of times of correct accidental access response message and special-purpose random access guiding reaches the predefined maximum number of times that allows.
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| CN113163506B (en) * | 2021-03-09 | 2022-04-22 | 中国电子科技集团公司第五十四研究所 | Random access method based on cyclic offset real Chirp signal |
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