CN101316134A - Accidental access method and corresponding terminal and base station adopting the same - Google Patents
Accidental access method and corresponding terminal and base station adopting the same Download PDFInfo
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- CN101316134A CN101316134A CNA2007100999345A CN200710099934A CN101316134A CN 101316134 A CN101316134 A CN 101316134A CN A2007100999345 A CNA2007100999345 A CN A2007100999345A CN 200710099934 A CN200710099934 A CN 200710099934A CN 101316134 A CN101316134 A CN 101316134A
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Abstract
The invention discloses a random access method for the random access of a terminal, which includes the steps of: detecting the dispatching information transmitted by a base station at the down dispatching channel after the Preamble is transmitted; judging if a Preamble collision occurs after the dispatching information is detected at the down dispatching channel; transmitting the Preamble again at the up access resource indicated by the dispatching information if the Preamble collision occurs; receiving the random access response message at the message bearer channel indicated by the dispatching information if the Preamble collision does not occur. The invention also discloses a terminal which adopts the access method; additionally, the invention discloses a random access method for the treatment and response of the base station on the random access of the terminal and a base station that adopts the method.
Description
Technical field
The present invention relates to the mobile communication technology field, the corresponding terminal and the base station that relate in particular to a kind of accidental access method and adopt this method.
Background technology
In mobile communication system, terminal is set up uplink synchronous with the base station by random access procedure.Existing random access scheme is:
In end side: terminal is selected a Preamble at random in all available random access leader sequences (Preamble), and select a Random Access Channel (RACH, Random Access Channel) sends this Preamble, start simultaneously and insert timer at random, carry out timing.If terminal is received accidental access response (the Random Access Response) message that the base station sends during timing, then by the timing adjustment amount (TA in this message, Timing Adjustment) transmitting time of adjusting upstream message can be set up the uplink synchronous with the base station, and resets and insert timer at random.If it is overtime to insert the timer timing at random, then the terminal check base station does not respond, and according to backoff algorithm random wait a period of time, and then initiate random access procedure.When terminal is initiated random access procedure once more, need to promote the transmitted power of Preamble.
At network side: the base station is detected the RACH channel, after receiving the Preamble that terminal sends, if this Preamble does not bump, then calculate the skew of the time of advent with the desirable time of advent of this Preamble, then it is sent to terminal as TA by accidental access response message; If this Preamble bumps, then do not send the accidental access response message of this Preamble.
Wherein, send in the process of Preamble in terminal, if two terminals have been selected identical Preamble and have been gone up transmission at same access-in resource (RACH Occasion), think that then Preamble bumps, the terminal that the Preamble collision takes place is called the collision terminal.
As can be seen, existing random access scheme mainly contains following three weak points:
1, the collision terminal need start backoff algorithm, and random wait could be initiated random access procedure after a period of time once more, and this has increased the time delay that terminal inserts at random greatly;
2, since terminal can't judge do not receive the base station to insert at random corresponding be because Preamble collision or because the transmitted power deficiency of Preamble, so, the terminal of those transmitted power deficiencies also can start the random back algorithm, causes the terminal insignificant increase of access delay at random;
3, the collision terminal is still all initiated to insert at random on RACH, has increased the load of RACH.
Summary of the invention
In view of this, corresponding terminal and base station that the technical problem that the present invention solves provides a kind of accidental access method and adopts this method are to solve the weak point that existing random access scheme exists.
For this reason, technical scheme provided by the invention is as follows:
A kind of accidental access method is used for the access at random of terminal, and this method comprises:
After sending random access leader sequence Preamble, the schedule information that sends in descending scheduling Channel Detection base station;
After schedule information, judge whether to take place the Preamble collision in the descending scheduling Channel Detection;
When the Preamble collision took place, the up access-in resource of indicating in schedule information sent Preamble once more;
When the Preamble collision does not take place, in the message bearing channel receiving random access response message of schedule information indication.
Wherein, further comprise:
If do not detect schedule information at the descending scheduling channel, then promote the transmitted power of Preamble, insert at random at the next one and send Preamble constantly once more.
Wherein, learn according to the indication of corresponding indicating bit in the schedule information whether the Preamble collision takes place.
Wherein, the descending scheduling channel has two classes, according to which kind of scheduling channel to detect schedule information at, learns whether the Preamble collision takes place.
Wherein, described descending scheduling channel has corresponding relation with the RACH that sends Preamble.
A kind of accidental access method is used for the processing response that the base station is inserted at random to terminal, and this method comprises:
After detecting the random access leader sequence Preamble of terminal transmission, when detected Preamble bumps, dispatch special-purpose up access-in resource, the indication information of described up access-in resource is set in schedule information; When detected Preamble does not bump, in schedule information, be provided for sending the indication information of the message bearing channel of accidental access response message.
Send schedule information at the descending scheduling channel, and indicate described terminal whether the Preamble collision takes place.
Wherein, further comprise:
After sending the schedule information of the up access-in resource of indication, the Preamble that time slot and the frequency detecting terminal at described up access-in resource place sends.
Wherein, by corresponding indicating bit in the schedule information is set, indicate whether to take place the Preamble collision.
Wherein, the descending scheduling channel has two classes;
According to whether the Preamble collision taking place, in the scheduling channel transmission schedule information of respective classes, to indicate whether to take place the Preamble collision.
Wherein, described descending scheduling channel and described RACH have corresponding relation.
A kind of terminal comprises:
Detecting unit is used for after sending random access leader sequence Preamble the schedule information that sends in descending scheduling Channel Detection base station;
Judging unit is used for after detecting unit detects schedule information, determines whether to take place the Preamble collision;
Access unit is used for when the Preamble collision takes place once more, and the up access-in resource of indicating in schedule information sends Preamble once more;
The response message receiving element is used for when the Preamble collision does not take place, in the message bearing channel receiving random access response message of schedule information indication.
Wherein, also comprise:
The power ascension unit is used for when detecting unit does not detect schedule information, promotes the transmitted power of Preamble, inserts at random at the next one and constantly notifies terminal to send Preamble once more.
Wherein, judging unit learns according to the indication of corresponding indicating bit in the schedule information whether the Preamble collision takes place.
Wherein, the descending scheduling channel has two classes;
Judging unit detects schedule information according to detecting unit at which kind of scheduling channel, determines whether to take place the Preamble collision.
A kind of base station comprises:
Scheduling unit is used for when detected random access leader sequence Preamble bumps, and dispatches special-purpose up access-in resource, and the indication information of described up access-in resource is set in schedule information, sends schedule information at the descending scheduling channel;
Response unit is used for when detected Preamble does not bump, and is provided for sending the indication information of the message bearing channel of accidental access response message in schedule information, sends schedule information at the descending scheduling channel;
Indicating member is used for indicating terminal whether the Preamble collision takes place.
Wherein, also comprise:
Detecting unit is used for after scheduling unit sends schedule information, the Preamble that time slot and the frequency detecting terminal at described up access-in resource place sends.
Wherein, indicating member indicates whether to take place the Preamble collision by corresponding indicating bit in the schedule information is set.
Wherein, the descending scheduling channel has two classes;
Indicating member notice scheduling unit sends schedule information at first kind scheduling channel, with indication the Preamble collision takes place;
Indicating member push-notification-answer unit sends schedule information at the second class scheduling channel, with indication the Preamble collision does not take place.
In the present invention, after the Preamble collision is found in the base station, be the up access-in resource of a special use of collision terminal scheduling, the collision terminal can utilize the up access-in resource of this special use to initiate the secondary random access procedure.Because the collision terminal can very fast acquisition send the chance of Preamble once more, so shortened the time delay that inserts at random.The up access-in resource of collision terminal utilization special use inserts at random, can also reduce the load of RACH; Have plural terminal and utilize special-purpose up access-in resource to send Preamble simultaneously, thereby improve resource utilization.Because the present invention has shortened the access delay at random of collision terminal, the collision probability on the RACH is required also can suitably relax, and then be the resource of RACH configuration in can the minimizing system, the resource utilization of raising system.
Description of drawings
Fig. 1 is the flow chart that inserts at random of the end side that proposes of the present invention;
Fig. 2 is the flow chart that inserts at random of the base station side that proposes of the present invention;
Fig. 3 is the schematic diagram of the subframe structure of a kind of TDD system;
Fig. 4 is the schematic diagram of the terminal that proposes of the present invention;
Fig. 5 is the schematic diagram of the base station that proposes of the present invention.
Embodiment
Basic thought of the present invention is, after the Preamble collision is found in the base station, is the up access-in resource of a special use of collision terminal scheduling, and the collision terminal can be utilized the up access-in resource initiation secondary random access procedure of this special use.
For making those skilled in the art understand the present invention better, below in conjunction with specific embodiment method provided by the invention is specified, Fig. 1 is the flow chart that inserts at random of the end side that proposes of the present invention.
Terminal at first at the time slot at RACH place, promptly inserts constantly when inserting at random at random, selects a Preamble at random in available Preamble, and selects a RACH to send this Preamble (step 11).After terminal sends Preamble, will detect the descending scheduling channel to learn whether the base station sends schedule information (step 12) in the window in detection time.
Wherein, detection time, the length and the original position of window were that terminal is known in advance, and detection time, the length and the original position of window can be stipulated by agreement, also can be by the base station by each terminal of broadcast announcement.
In addition, can set up the corresponding relation of descending scheduling channel and RACH in advance, the corresponding relation of descending scheduling channel and RACH can be stipulated by agreement, also can pass through each terminal of broadcast announcement by the base station.After terminal is learnt the corresponding relation of descending scheduling channel and RACH, promptly can determine corresponding one or several scheduling channel that needs detect according to selected RACH then.
As can be seen, by setting up the corresponding relation of descending scheduling channel and RACH, can avoid terminal that all descending scheduling channels are detected, thereby can reduce the operating load of terminal effectively.
If terminal does not detect the schedule information that the base station sends in detection time in the window, think that then the base station do not receive the Preamble of its transmission, this moment, terminal should promote the transmitted power (step 13) of Preamble.Insert at random constantly at the next one, terminal is initiated random access procedure once more, and promptly execution in step 11.
Need to prove, in existing random access scheme,,, and then initiate random access procedure with the transmitted power of lifting Preamble and according to backoff algorithm random wait a period of time if terminal confirms that the base station does not respond.This be because the base station not the situation of response terminal comprise two kinds:
1, the base station detects the Preamble that terminal sends collision has taken place;
2, the power of terminal transmission Preamble is not enough, causes the base station not detect the Preamble that terminal sends.
For first kind of situation, if all inserting at the next one immediately at random, two terminals of collision (supposing to collide in twos) constantly send Preamble, the probability that the Preamble collision then takes place once more still can be than higher.Bump once more for avoid as far as possible, terminal has adopted the random back algorithm, and random wait is initiated random access procedure after a period of time once more.Like this, the moment that the collision terminal sends Preamble once more just has been randomized, and the probability that the Preamble collision takes place has once more also just reduced.
For second kind of situation, terminal need promote the transmitted power of Preamble.
Because terminal can't be learnt any situation takes place on earth, so in existing technical scheme, terminal should be enabled the transmitted power that backoff algorithm promotes Preamble again.
For first kind of situation, the transmitted power that promotes Preamble not only can be wasted the transmitted power of terminal, also can increase the interference to other terminal.
For second kind of situation, random wait a period of time will bootlessly increase the time delay that terminal inserts at random.
And in random access scheme provided by the invention, even the Preamble that terminal sends bumps, the base station still can send schedule information to terminal, therefore the base station does not send schedule information and has only a kind of to the situation of terminal, the power that is exactly terminal transmission Preamble is not enough, causes the base station to fail to receive the Preamble that terminal sends.So in the present embodiment,, only need to promote the transmitted power of Preamble, insert at random constantly, initiate random access procedure once more and get final product at the next one if terminal does not detect the schedule information that the base station sends.
If terminal detects the schedule information that the base station sends in detection time in the window, then need to determine whether to take place Preamble collision (step 14).
Here need to prove:
For the terminal that the Preamble collision does not take place in the random access procedure, the base station sends schedule information to described terminal by scheduling channel, terminal can in message bearing channel receiving random access response message, carry TA according to the indication of this schedule information in accidental access response message;
For the collision terminal in the random access procedure, the base station sends schedule information to described terminal by scheduling channel, and what this schedule information was indicated is that the base station is the dedicated uplink access-in resource of collision terminal scheduling.
The structure of adoptable scheduling channel has multiple, and a kind of structure of scheduling channel can be as shown in table 1.
Table 1
| Numbering | Title | Explanation |
| 1 | ID (terminal or set of terminal) | The object of indicating this dispatch to dispatch, this object may be certain terminal or a certain group of terminal |
| 2 | Resource information | Indicate the time-frequency position of this dispatch institute scheduled resources and the duration of resource allocation |
| 3 | Other | With relevant information such as antenna, modulation system and HARQ |
Pick out it and whether be scheduled for what make that terminal can be clear and definite, should comprise following information in the schedule information:
The ID of scheduled terminals: this ID is that system reserves, and is used for scheduling and accesses terminal at random.When system remained with a plurality of ID that is used for access dispatching at random, the terminal of initiating to insert at random can be determined the ID that it should be monitored according to the RACH of its selection;
Preamble sequence number: owing to, have different terminals on the RACH and send different Preamble a moment.It is scheduling to the terminal that sends which Preamble that the base station indicates the current scheduling signaling with this sequence number.Each terminal in the same set of terminal can learn by the Preamble sequence number whether the current scheduling signaling sends to oneself;
Resource information: for the terminal that the Preamble collision does not take place in the random access procedure, what this resource information was indicated is the running time-frequency resource position of message bearing channel; For the collision terminal in the random access procedure, what this resource information was indicated is that the base station is the running time-frequency resource position of the dedicated uplink access of terminal scheduling;
The collision indication: whether this information indicating terminal the Preamble collision takes place in random access procedure, so that terminal makes an explanation to the implication of above-mentioned " resource information " in view of the above;
" collision indication " can explicitly carry, and for example, shows with a bit (bit) explicitly whether terminal the Preamble collision takes place;
" collision indication " also can implicit expression carry, for example, use two classes different ID scheduling collision terminal and non-collision terminal, promptly, monitor the scheduling channel of two class different I D behind the terminal transmission Preamble simultaneously, if terminal finds that it is used to dispatch the ID scheduling of collision terminal, then confirms to take place the Preamble collision; Otherwise, the Preamble collision does not take place.
When the channel architecture shown in the employing table 1, a kind of possible information mode of carrying is: " ID " of access dispatching carried by " territory 1 " in the table 1 at random; " resource information " carried by " territory 2 " in the table 1; " Preamble " sequence number and explicit " collision indication " of carrying are carried by " territory 3 " in the table 1.
If Preamble collision takes place, then can (step 15) be set up the uplink synchronous (step 16) with the base station then in message bearing channel receiving random access response message according to the indication of schedule information.
If the Preamble collision takes place, then can learn dedicated uplink access-in resource (step 17) according to the indication of schedule information, send a Preamble (step 18) who selects at random again at described dedicated uplink access-in resource then.
Terminal will continue whether base stations detected sends schedule information in the detection time window after the dedicated uplink access-in resource sends Preamble, i.e. execution in step 12 once more.
More than be the complete random access procedure of end side, the access processing procedure at random to the relevant base station side describes below, and Fig. 2 is the flow chart that inserts at random of the base station side that proposes of the present invention.
The base station is promptly inserted constantly at random at the time slot at RACH place, and the Preamble that may occur on the RACH is detected (step 21) one by one.
The base station if the base station detects Preamble, then needs further detection whether Preamble collision (step 22) has taken place if do not detect then execution in step 21 once more of Preamble.
If the Preamble collision does not take place, then the base station calculates TA (step 23) according to the time of advent of this Preamble with ideal the time of advent, and the base station sends corresponding scheduling information to terminal (step 24) in the detection time of terminal in the window.
Wherein, schedule information has been indicated the time slot of message bearing channel and the position of frequency, and the base station sends accidental access response message to terminal by the message bearing channel, carries TA in accidental access response message.
If the Preamble collision takes place, then the base station is collision terminal scheduling dedicated uplink access-in resource (step 25), and the base station sends corresponding scheduling information to terminal (step 26) in the detection time of terminal in the window.
Wherein, schedule information has been indicated the information of dedicated uplink access-in resource, comprising: the beginning time slot, the duration, carry rate and available Preamble sign indicating number etc.
When the dedicated uplink access-in resource was reserved in the base station, the factor that should consider comprised:
The duration of dedicated uplink access-in resource: the collision terminal (for simplicity, here only consider two terminal case of collision) probability that Preamble collision takes place once more is that (Preamble_Num is on the access-in resource piece of base station appointment to 1/Preamble_Num, the number of alternative Preamble), if the duration of up access-in resource is long more, the length of the Preamble sign indicating number that can send thereon is also just long more, the quantity of corresponding available Preamble is just many more, collision probability is just low more, the collision probability that the duration of base station by control dedicated uplink access-in resource can control terminal be inserted once more;
Uplink business data amount: when uplink service is heavy, should shorten the duration of dedicated uplink access-in resource, to guarantee professional transmission.
The base station is in the process that sends accidental access response message, scheduling channel and message bearing channel have been used simultaneously, in the process that sends dedicated uplink access-in resource information, only used scheduling channel, specifically see also the end side explanation of the step 14 of access process at random.
The base station can be by " collision indication " position in the schedule information, whether the terminal that shows explicitly the Preamble collision takes place, also can show that whether terminal the Preamble collision takes place, and specifically sees also the end side explanation of the step 14 of access process at random by implicit expression.
Send dedicated uplink access-in resource information to terminal after, the base station is detected (step 27) in the time slot and the frequency at dedicated uplink access-in resource place one by one to the Preamble that may occur on the dedicated uplink access-in resource.Whether after the base station detects Preamble, still need to detect Preamble and bump, promptly execution in step 22, carry out subsequent operation according to testing result then.
Below, by one more specifically example the random access scheme that the present invention proposes is described.
Fig. 3 shows the subframe structure of a kind of TDD system, and technical scheme provided by the invention is applicable to but is not only applicable to TDD system or subframe structure shown in Figure 3.
In Fig. 3, time slot TS0, TS1, TS9～TS13 are descending time slot; TS2～TS8 is an ascending time slot.Down up switching point protection time slot is arranged between TS1 and TS2, up-downgoing switching point protection time slot is arranged between TS8 and the TS9.Two RACH are arranged in the ascending time slot TS2 of subframe N.
Suppose terminal 1 and the identical Preamble of terminal 2 selections, and on same RACH, send this Preamble.
The base station is at the ascending time slot TS2 of subframe N, detects that Preamble bumps on RACH, and the base station will be dedicated uplink access-in resource of collision terminal scheduling on the ascending time slot TS3 of subsequently subframe N+1 and TS4.
The base station is at the descending time slot TS10 of subframe N, sends schedule information, informs that the collision terminal reserved the dedicated uplink access-in resource on the ascending time slot TS3 of subframe N+1 and TS4.
Terminal 1 and terminal 2 can detect the schedule information that the base station sends in the detection time of subframe N window descending time slot TS9～TS11.After terminal 1 and terminal 2 learn that Preamble bumps, can learn that the indicated resource of schedule information is the dedicated uplink access-in resource.
Terminal 1 and terminal 2 will be reselected Preamble, and send this Preamble on the dedicated uplink access-in resource of base station indication.The base station is detected Preamble at ascending time slot TS3 and the TS4 of subframe N+1 on the dedicated uplink access-in resource.After detecting Preamble, further detect Preamble and whether bump.
If Preamble does not bump, then calculate the TA of each Preamble, and by schedule information the information of message bearing channel is sent to terminal 1 and terminal 2 respectively, and send corresponding accidental access response message to terminal 1 and terminal 2 by the message bearing channel at the descending time slot TS9 of subframe N+1 and TS10.
If Preamble bumps, then the base station is dedicated uplink access-in resource of collision terminal scheduling once more, and sends schedule information at the descending time slot TS10 of subframe N+1.
Terminal 1 and 2 can detect the schedule information that the base station sends in the detection time of subframe N+1 window descending time slot TS9～TS12, carry out follow-up associative operation.
Based on the foregoing description, the present invention also proposes to adopt accordingly the terminal and the base station of this cut-in method.Fig. 4 is the schematic diagram of terminal, and Fig. 5 is the schematic diagram of base station.
As can be seen from Figure 4, terminal comprises: detecting unit S41, judging unit S42, access unit S43 and response message receiving element S44 once more.
Terminal at first at the time slot at RACH place, promptly inserts constantly when inserting at random at random, selects a Preamble at random in available Preamble, and selects a RACH to send this Preamble.After terminal sends Preamble, detecting unit S41 will detect the descending scheduling channel to learn whether the base station sends schedule information in the window in detection time.
Wherein, detection time, the length and the original position of window were that terminal is known in advance, and detection time, the length and the original position of window can be stipulated by agreement, also can be by the base station by each terminal of broadcast announcement.
If detecting unit S41 does not detect the schedule information that the base station sends in detection time in the window, think that then the base station do not receive the Preamble of its transmission.
Terminal can also have a power ascension unit, and when detecting unit S41 did not detect schedule information, the power ascension unit can promote the transmitted power of Preamble, inserts at random at the next one and constantly notifies terminal to initiate random access procedure once more.
If detecting unit S41 detects the schedule information that the base station sends in the window in detection time, then judging unit S42 need determine whether to take place Preamble collision (step 14).
Here need to prove:
For the terminal that the Preamble collision does not take place in the random access procedure, the base station sends schedule information to described terminal by scheduling channel, terminal can in message bearing channel receiving random access response message, carry TA according to the indication of this schedule information in accidental access response message;
For the collision terminal in the random access procedure, the base station sends schedule information to described terminal by scheduling channel, and what this schedule information was indicated is that the base station is the dedicated uplink access-in resource of collision terminal scheduling.
The structure of adoptable scheduling channel has multiple, and a kind of structure of scheduling channel can be as shown in table 1.
Pick out it and whether be scheduled for what make that terminal can be clear and definite, should comprise following information in the schedule information:
The ID of scheduled terminals: this ID is that system reserves, and is used for scheduling and accesses terminal at random.When system remained with a plurality of ID that is used for access dispatching at random, the terminal of initiating to insert at random can be determined the ID that it should be monitored according to the RACH of its selection;
Preamble sequence number: owing to, have different terminals on the RACH and send different Preamble a moment.It is scheduling to the terminal that sends which Preamble that the base station indicates the current scheduling signaling with this sequence number.Each terminal in the same set of terminal can learn by the Preamble sequence number whether the current scheduling signaling sends to oneself;
Resource information: for the terminal that the Preamble collision does not take place in the random access procedure, what this resource information was indicated is the running time-frequency resource position of message bearing channel; For the collision terminal in the random access procedure, what this resource information was indicated is that the base station is the running time-frequency resource position of the dedicated uplink access of terminal scheduling;
The collision indication: whether this information indicating terminal the Preamble collision takes place in random access procedure, so that terminal makes an explanation to the implication of above-mentioned " resource information " in view of the above;
" collision indication " can explicitly carry, and for example, shows with a bit (bit) explicitly whether terminal the Preamble collision takes place;
" collision indication " also can implicit expression carry, for example, use two classes different ID scheduling collision terminal and non-collision terminal, promptly, after terminal sends Preamble, detecting unit S41 will monitor the scheduling channel of two class different I D simultaneously, be used to dispatch the ID scheduling of collision terminal if find it, then show the Preamble collision takes place; Otherwise, show the Preamble collision do not take place.
When the channel architecture shown in the employing table 1, a kind of possible information mode of carrying is: " ID " of access dispatching carried by " territory 1 " in the table 1 at random; " resource information " carried by " territory 2 " in the table 1; " Preamble " sequence number and explicit " collision indication " of carrying are carried by " territory 3 " in the table 1.
When adopting explicit way to carry the collision indication, judging unit S42 can learn whether the Preamble collision takes place according to the indication of " collision indication " position in the schedule information.
When adopting the implicit expression mode to carry the collision indication, judging unit S42 can detect schedule information at which kind of scheduling channel according to detecting unit S41, determines whether to take place the Preamble collision.
If Preamble collision takes place, response message receiving element S44 can be according to the indication of schedule information in message bearing channel receiving random access response message.
Terminal utilizes the TA in the receiving random access response message to set up uplink synchronous with the base station.
If the Preamble collision takes place, access unit S43 can learn the dedicated uplink access-in resource according to the indication of schedule information once more, sends a Preamble who selects at random again at described dedicated uplink access-in resource.
Access unit S43 is after the dedicated uplink access-in resource sends Preamble once more, detecting unit S41 will be once more in the detection time window base stations detected whether send schedule information.
After in conjunction with Fig. 4 terminal provided by the invention being specifically described, base station provided by the invention is specified below in conjunction with Fig. 5.As can be seen from Figure 5, the base station comprises: scheduling unit S51, response unit S52 and indicating member S53.
The base station is promptly inserted constantly at random at the time slot at RACH place, and the Preamble that may occur on the RACH is detected one by one.If the base station detects Preamble, then need further detection whether the Preamble collision has taken place.
If the Preamble collision does not take place, then the base station is according to calculating the time of advent of this Preamble and the desirable time of advent TA (step 23), response unit S52 sends corresponding scheduling information to terminal at the descending scheduling channel in the detection time of terminal in the window, wherein, schedule information has been indicated the time slot of message bearing channel and the position of frequency.
The base station sends accidental access response message to terminal by the message bearing channel, carries TA in accidental access response message.
If the Preamble collision takes place, then scheduling unit S51 at descending scheduling channel sends corresponding scheduling information to terminal in the detection time of terminal in the window for collision terminal scheduling dedicated uplink access-in resource.
Wherein, schedule information has been indicated the information of dedicated uplink access-in resource, comprising: the beginning time slot, the duration, carry rate and available Preamble sign indicating number etc.
When the dedicated uplink access-in resource was reserved in the base station, the factor that should consider comprised:
The duration of dedicated uplink access-in resource: the collision terminal (for simplicity, here only consider two terminal case of collision) probability that Preamble collision takes place once more is that (Preamble_Num is on the access-in resource piece of base station appointment to 1/Preamble_Num, the number of alternative Preamble), if the duration of up access-in resource is long more, the length of the Preamble sign indicating number that can send thereon is also just long more, the quantity of corresponding available Preamble is just many more, collision probability is just low more, the collision probability that the duration of base station by control dedicated uplink access-in resource can control terminal be inserted once more;
Uplink business data amount: when uplink service is heavy, should shorten the duration of dedicated uplink access-in resource, to guarantee professional transmission.
The base station is in the process that sends accidental access response message, scheduling channel and message bearing channel have been used simultaneously, in the process that sends dedicated uplink access-in resource information, only used scheduling channel, specifically see also the end side explanation of the step 14 of access process at random.
Indicating member S53 can be by " collision indication " position in the schedule information, and explicitly shows whether terminal the Preamble collision takes place, and also can show whether terminal the Preamble collision takes place by implicit expression.
When adopting explicit way to collide indication, indicating member S53 can be by " collision indication " position in the schedule information is set, to show whether the Preamble collision takes place.
When adopting the implicit expression mode to collide indication, indicating member S53 can notify scheduling unit S51 to send schedule information at first kind scheduling channel, to show the Preamble collision takes place; Indicating member S53 can push-notification-answer cell S 52 send schedule information at the second class scheduling channel, to show the Preamble collision does not take place.
The base station can also comprise a detecting unit, is used for after scheduling unit S51 transmission dedicated uplink access-in resource information is to terminal, and the time slot at dedicated uplink access-in resource place detects one by one to the Preamble that may occur on the dedicated uplink access-in resource.
Those skilled in the art can understand, various exemplary method step of describing in conjunction with the disclosed embodiments and device unit all can electronic hardware here, software or the combination of the two realize.In order to be clearly shown that the interchangeability between the hardware and software, more than various exemplary steps and unit are all carried out generally description with its functional form.This functional be to realize or realize depending on specific application and the design constraint of whole system institute's time with software with hardware.Those skilled in the art can be at each specific application, realize in many ways described functional, but the result of this realization should not be construed as and on the contrary deviates from scope of the present invention.
Utilize general processor, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logical device, discrete gate or transistor logic, discrete hardware components or the combination in any among them, can realize or carry out the various exemplary unit of describing in conjunction with embodiment disclosed herein.General processor may be a microprocessor, but in another kind of situation, this processor may be processor, controller, microcontroller or the state machine of any routine.Processor also may be implemented as the combination of computing equipment, for example, and the combination of DSP and microprocessor, a plurality of microprocessor, one or more microprocessor or any other this kind structure in conjunction with the DSP core.
In conjunction with the step of the described method of above-mentioned disclosed embodiment can directly be presented as hardware, the software module carried out by processor or the combination of these two.Software module may be present in the storage media of RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, mobile disk, CD-ROM or any other form well known in the art.The coupling of a kind of exemplary storage medium and processor, thus make processor can be from this storage media read message, and can be to this storage media write information.In replacing example, storage media is the part of processor.Processor and storage media may be present among the ASIC.This ASIC may be present in the subscriber station.Replace in the example at one, the discrete assembly that processor and storage media can be used as in the subscriber station exists.
Described disclosed embodiment is provided, can makes those skilled in the art can realize or use the present invention.To those skilled in the art, the various modifications of these embodiment are conspicuous, and the general principles of definition here also can be applied to other embodiment on the basis that does not depart from the scope of the present invention with purport.Above-described embodiment only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (18)
1, a kind of accidental access method is used for the access at random of terminal, it is characterized in that, comprising:
After sending random access leader sequence Preamble, the schedule information that sends in descending scheduling Channel Detection base station;
After schedule information, judge whether to take place the Preamble collision in the descending scheduling Channel Detection;
When the Preamble collision took place, the up access-in resource of indicating in schedule information sent Preamble once more;
When the Preamble collision does not take place, in the message bearing channel receiving random access response message of schedule information indication.
2, accidental access method as claimed in claim 1 is characterized in that, further comprises:
If do not detect schedule information at the descending scheduling channel, then promote the transmitted power of Preamble, insert at random at the next one and send Preamble constantly once more.
3, accidental access method as claimed in claim 1 is characterized in that, learns according to the indication of corresponding indicating bit in the schedule information whether the Preamble collision takes place.
4, accidental access method as claimed in claim 1 is characterized in that, the descending scheduling channel has two classes, according to which kind of scheduling channel to detect schedule information at, learns whether the Preamble collision takes place.
5, accidental access method as claimed in claim 1 is characterized in that, described descending scheduling channel has corresponding relation with the RACH that sends Preamble.
6, a kind of accidental access method is used for the base station to the processing response that terminal inserts at random, it is characterized in that, comprising:
After detecting the random access leader sequence Preamble of terminal transmission, when detected Preamble bumps, dispatch special-purpose up access-in resource, the indication information of described up access-in resource is set in schedule information; When detected Preamble does not bump, in schedule information, be provided for sending the indication information of the message bearing channel of accidental access response message.
Send schedule information at the descending scheduling channel, and indicate described terminal whether the Preamble collision takes place.
7, accidental access method as claimed in claim 6 is characterized in that, further comprises:
After sending the schedule information of the up access-in resource of indication, the Preamble that time slot and the frequency detecting terminal at described up access-in resource place sends.
8, accidental access method as claimed in claim 6 is characterized in that, by corresponding indicating bit in the schedule information is set, indicates whether to take place the Preamble collision.
9, accidental access method as claimed in claim 6 is characterized in that, the descending scheduling channel has two classes;
According to whether the Preamble collision taking place, in the scheduling channel transmission schedule information of respective classes, to indicate whether to take place the Preamble collision.
10, accidental access method as claimed in claim 6 is characterized in that, described descending scheduling channel and described RACH have corresponding relation.
11, a kind of terminal that adopts the described method of claim 1 is characterized in that, comprising:
Detecting unit is used for after sending random access leader sequence Preamble the schedule information that sends in descending scheduling Channel Detection base station;
Judging unit is used for after detecting unit detects schedule information, determines whether to take place the Preamble collision;
Access unit is used for when the Preamble collision takes place once more, and the up access-in resource of indicating in schedule information sends Preamble once more;
The response message receiving element is used for when the Preamble collision does not take place, in the message bearing channel receiving random access response message of schedule information indication.
12, terminal as claimed in claim 11 is characterized in that, also comprises:
The power ascension unit is used for when detecting unit does not detect schedule information, promotes the transmitted power of Preamble, inserts at random at the next one and constantly notifies terminal to send Preamble once more.
13, terminal as claimed in claim 11 is characterized in that, judging unit learns according to the indication of corresponding indicating bit in the schedule information whether the Preamble collision takes place.
14, terminal as claimed in claim 11 is characterized in that, the descending scheduling channel has two classes;
Judging unit detects schedule information according to detecting unit at which kind of scheduling channel, determines whether to take place the Preamble collision.
15, a kind of base station of adopting the described method of claim 6 is characterized in that, comprising:
Scheduling unit is used for when detected random access leader sequence Preamble bumps, and dispatches special-purpose up access-in resource, and the indication information of described up access-in resource is set in schedule information, sends schedule information at the descending scheduling channel;
Response unit is used for when detected Preamble does not bump, and is provided for sending the indication information of the message bearing channel of accidental access response message in schedule information, sends schedule information at the descending scheduling channel;
Indicating member is used for indicating terminal whether the Preamble collision takes place.
16, base station as claimed in claim 15 is characterized in that, also comprises:
Detecting unit is used for after scheduling unit sends schedule information, the Preamble that time slot and the frequency detecting terminal at described up access-in resource place sends.
17, base station as claimed in claim 15 is characterized in that, indicating member indicates whether to take place the Preamble collision by corresponding indicating bit in the schedule information is set.
18, base station as claimed in claim 15 is characterized in that, the descending scheduling channel has two classes;
Indicating member notice scheduling unit sends schedule information at first kind scheduling channel, with indication the Preamble collision takes place;
Indicating member push-notification-answer unit sends schedule information at the second class scheduling channel, with indication the Preamble collision does not take place.
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