CN101547520A - Method for updating random access response parameters and random access response method - Google Patents
Method for updating random access response parameters and random access response method Download PDFInfo
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- CN101547520A CN101547520A CN200810088015A CN200810088015A CN101547520A CN 101547520 A CN101547520 A CN 101547520A CN 200810088015 A CN200810088015 A CN 200810088015A CN 200810088015 A CN200810088015 A CN 200810088015A CN 101547520 A CN101547520 A CN 101547520A
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Abstract
The invention discloses a method for updating random access response parameters and a random access response method. The method for updating the random access response parameters comprises the following steps that: before a terminal sends a random access precursor message to a base station, a retroversion control parameter is set as an initial value; after the terminal sends the random access precursor message to the base station and receives a random access response message returned by the base station, the terminal judges whether the random access response message contains the retroversion control parameter or not; if so, the terminal updates the value of the retroversion control parameter into the value of the retroversion control parameter contained in the random access response message; and otherwise, the terminal keeps the original value of the retroversion control parameter. The method is adopted to ensure that the terminal obtains the accurate retroversion control parameter in the random access process, only needs to update the retroversion control parameter once, simplifies the terminal operation and saves the time of the random access process of the terminal.
Description
Technical field
The present invention relates to wireless telecommunication system, relate in particular to a kind of update method and accidental access response method of accidental access response parameter.
Background technology
As shown in Figure 1, mainly (CoreNetwork CN) forms cellular radio communication system by terminal, base station and core net.The network that the base station is formed is called wireless access network, and (Radio Access Network RAN) is responsible for the Access Layer affairs, such as the management of Radio Resource etc.Can there be physics or connection in logic according to actual conditions between the base station, as being connected of the base station among Fig. 11 and base station 2 or base station 3.Each base station can be connected with one or more than one core net node.Core net is responsible for the Non-Access Stratum affairs, such as position renewal etc.Terminal is meant the various device that can carry out communication with the cellular radio communication network, such as mobile phone, personal digital assistant or notebook computer etc.
In the existing LTE (long evolving system), random access procedure comprises following three steps:
A, terminal send random access guiding message to the base station on certain random access time slot;
B, base station (enode b) are to the terminal responds accidental access response message;
If the c terminal is received correct accidental access response message in receive window, then make corresponding processing according to its content; If terminal is not received correct accidental access response message in the time of reception window, when not reaching maximum number of retransmissions, terminal can be retransmitted random access guiding message.
The repetition period of supposing random access time slot prevailingly is 10 milliseconds, random access time slot is 1 millisecond apart from the skew of radio frames starting end, the time started of time of reception window, the concluding time of time of reception window was apart from 5 milliseconds of time starteds apart from 2 milliseconds of random access time slots.It may be that terminal wants to set up the Radio Resource control connection that terminal is initiated to trigger the reason that inserts at random, or received that the switching command that the base station sends requires to switch to Target cell, thereby or terminal want to regain the up up or descending data of recovering synchronously and send.The time of reception window of hereinafter mentioning is a time interval, is used for defining terminal after the transmission that has triggered random access guiding message, waits for the time range of accidental access response.
When random access guiding message is retransmitted in the terminal decision, in order to prevent further congestion phenomenon, terminal can (being in the rollback Control Parameter time corresponding scope) be selected a time at random in a limited time range, retransmit random access guiding message then near the random access time slot of this select time.Such as cycle of the Random Access Channel of certain sub-district be a radio frames (a wireless frame length 10 milliseconds), then terminal is every 10 milliseconds of chances that once send random access guiding message, and random access time slot is at first subframe (1 radio frames has 10 subframes) i.e. of radio frame number 10 milliseconds the 1st millisecond.Terminal is at certain at random during access failure, random access procedure is at the 4th sub-frame end, if rollback Control Parameter (backoff) is 30 milliseconds, and terminal is through after the randomization, selected 15 milliseconds in this time range of 30 milliseconds, terminal is initiated to insert at random at the 2nd follow-up random access time slot again so.
According to present LTE agreement regulation, above-mentioned rollback Control Parameter is present in the header structure of MAC layer (media control layer) of accidental access response message.After terminal has sent random access guiding message, meeting receiving random access response message in a time of reception window.The time of reception window is a time interval, be used for defining terminal after having sent random access guiding message, wait for the time range of accidental access response message, can be with for example representing with respect to sending random access guiding message time started and the concluding time constantly, but do not limit therewith.The correct accidental access response message of terminal wait is meant the group identification RA-RNTI (random access radio network temporary mark) that comprises a predefined on the down control channel PDCCH, has corresponding relation between the random access time slot of this group identification and transmission random access guiding message; The index that also must have the random access guiding that sends in addition in the response message.The base station can send a plurality of accidental access response messages simultaneously, as long as all locate on the down control channel of these message with RA-RNTI, and in the time of reception window of regulation.The rollback Control Parameter of above mentioning is all effective to the terminal of the random access guiding index correspondence that comprises in the accidental access response message, and other parameter is then only relevant with the terminal of one of them index correspondence in the accidental access response message.Such as there being two terminals to send index is 1 and 3 random access guiding, rollback Control Parameter in accidental access response message is all effective to these two terminals so, corresponding with random access guiding index 1 and 3 respectively and these two terminals have corresponding respectively value but other parameter is such as Timing Advance TA or ephemeral terminations sign C-RNTI etc.
In the MAC of existing LTE agreement regulation,,, then this effective rollback Control Parameter is preserved if received the rollback Control Parameter when terminal the time at receiving random access response; If do not receive the rollback Control Parameter, rollback Control Parameter that so can this locality is set to 0, if i.e. terminal generation random access guiding message retransmission can send on next random access time slot so at once.When the random access guiding message that a plurality of terminals send is received in the base station on same random access time slot, then may return a plurality of accidental access response messages.Terminal can repeat the renewal of upgrading even making a mistake when upgrading the rollback Control Parameter in this case.Such as: terminal 1 has sent random access guiding message with terminal 2 on identical random access time slot in certain random access procedure, waits for accidental access response message then in identical time receive window.If the base station has sent two accidental access response messages altogether, first accidental access response message is the response corresponding to terminal 1, second accidental access response message is the response corresponding to terminal 2, and the rollback Control Parameter is arranged in first response message, terminal 1 is because obtain rollback Control Parameter and corresponding response parameter in first identical response message, so all are normal so; But for terminal 2, receive that the 1st response message only upgraded the rollback Control Parameter later on, when receiving the 2nd response message, obtained the corresponding response parameter, but because the 2nd response message do not have the rollback Control Parameter, so terminal 2 is updated to 0 with the rollback Control Parameter, thereby mistake has taken place.If the base station is included in the rollback Control Parameter in the 2nd response message, terminal 1 needs to wait for the 2nd response message, thereby has introduced extra time delay in order to obtain correct rollback Control Parameter so.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of update method and accidental access response method of accidental access response parameter, guarantees that terminal obtains correct accidental access response parameter, simplifies terminal operation, saves the time of terminal random access procedure.
In order to solve the problems of the technologies described above, the invention provides a kind of update method of accidental access response parameter, comprising:
Terminal its rollback Control Parameter before the base station sends random access guiding message is set to initial value; Described terminal is after the base station sends random access guiding message and receives the accidental access response message that returns the base station, whether comprise the rollback Control Parameter in the described accidental access response message of described terminal judges, if described terminal is updated to the value of its rollback Control Parameter the value of the rollback Control Parameter that comprises in the described accidental access response message; Otherwise described terminal keeps the value of its original rollback Control Parameter.
Further, carry the rollback Control Parameter in first accidental access response message in terminal time of reception window of described base station.
Further, when described terminal is initial value in its rollback Control Parameter, on the next random access time slot behind the access failure at random, retransmit random access guiding message.
Further, the initial value of described rollback Control Parameter is 0.
The present invention also provides a kind of accidental access response method, comprising: terminal sends random access guiding message to the base station; Accidental access response message is returned to terminal in described base station, and carries the rollback Control Parameter in first accidental access response message in the time of reception window; Whether the described accidental access response message of terminal judges comprises the rollback Control Parameter, if, the value of its rollback Control Parameter is updated to the value of the rollback Control Parameter that comprises in the described accidental access response message, otherwise, keep the value of its original rollback Control Parameter.
Further, described terminal is before the base station sends random access guiding message, and its rollback Control Parameter is set to initial value.
Further, when described terminal is initial value in its rollback Control Parameter, on the next random access time slot behind the access failure at random, retransmit random access guiding message.
Further, the initial value of described rollback Control Parameter is 0.
Adopt method of the present invention, in random access procedure, guarantee that terminal obtains correct rollback Control Parameter, and, simplified terminal operation, saved the time of terminal random access procedure as long as upgrade a rollback Control Parameter.Simultaneously, only in an accidental access response message, comprise the rollback Control Parameter, reduced the expense of downlink signaling.
Description of drawings
Fig. 1 is the schematic diagram according to the cellular radio communication system of prior art;
Fig. 2 is the schematic diagram of the rollback Control Parameter update method among the embodiment one;
Fig. 3 is the schematic diagram of the rollback Control Parameter update method among the embodiment two;
Fig. 4 is the schematic diagram of the rollback Control Parameter update method among the embodiment three.
Embodiment
Among the present invention, the update method of rollback Control Parameter comprises in the random access procedure:
Terminal is judged when not comprising the rollback Control Parameter in the described accidental access response message after the base station sends random access guiding message and receives the accidental access response message that returns the base station, is kept the value of its original rollback Control Parameter.
Wherein, when comprising the rollback Control Parameter in the described accidental access response message of terminal judges, the value of its rollback Control Parameter is updated to the value of the rollback Control Parameter that comprises in the described accidental access response message.
Wherein, terminal is before the base station sends random access guiding message, and its rollback Control Parameter is set to initial value.Rollback Control Parameter initial value can be 0.
Wherein, when the rollback Control Parameter was set to initial value, terminal was retransmitted random access guiding message on the later next random access time slot of access failure at random.
Wherein, carry the rollback Control Parameter in first accidental access response message in terminal time of reception window of base station, terminal is received in the time of reception window in first accidental access response message, according to the entrained rollback Control Parameter of response message situation is set and upgrades local rollback Control Parameter.
In first embodiment, terminal is only received an accidental access response message in the time of reception window, and rollback Control Parameter method for updating may further comprise the steps:
Step S201, terminal is before sending random access guiding message to the base station, and the initialization of rollback Control Parameter is set to 0;
Step S202, terminal sends random access guiding message to the base station, and wherein the index of random access guiding message is 13, and the group identification of the random access guiding message of expectation is 0X4352;
Step S203, accidental access response message is returned to this terminal in the base station, and comprising the rollback Control Parameter, its value is 3; Also comprised random access guiding index 13 and and other parameters of this index correspondence such as Timing Advance TA etc.; Its value of RA-RNTI that also is included in random access guiding message is 0X4352;
Step S204, terminal is after receiving this accidental access response message, and the index by relatively RA-RNTI and random access guiding is identical with the value of expectation has determined to receive correct accidental access response message, and the rollback Control Parameter of upgrading this locality simultaneously is 3.
In a second embodiment, terminal is retransmitted random access guiding message according to the rollback Control Parameter of receiving for the first time after the random access procedure failure first time, and this method may further comprise the steps:
Step S301～S304 is identical with above-mentioned steps S201～S204;
Step S305, terminal sends random accessing message 3 (as wireless resource control connection request message) failure;
Step S306, terminal is retransmitted the time slot that inserts at random according to its rollback Control Parameter decision, initiates random access guiding message then again, and its index is 18, and the group identification of expectation is 0X4352;
Step S307, accidental access response message is returned to terminal in the base station, comprising the index 18 of random access guiding and and other parameters such as the TA and the uplink scheduling resource etc. of this index correspondence; Comprise that also group identification RA-RNTI value is 0X4352; Do not comprise the rollback Control Parameter in the accidental access response message;
Step S308, terminal is after receiving this accidental access response message, index by relatively RA-RNTI and random access guiding is identical with expectation, determined to receive correct accidental access response message, do not comprise the rollback Control Parameter in the terminal judges accidental access response message, then keeping local rollback Control Parameter is 3.
In the 3rd embodiment, there are two terminals to send random access guiding message at identical random access time slot, terminal receives two accidental access response messages in the time of reception window, and this method may further comprise the steps:
Step S401, terminal is before sending random access guiding message to the base station, and the initialization of rollback Control Parameter is set to 0;
Step S402, terminal 1 and terminal 2 send random access guiding message simultaneously to the base station, and the index of the random access guiding of two terminal correspondences of its neutralization is 13,24, and the group identification of expectation is 0X4352;
Step S403, the base station sends first accidental access response message, comprising rollback Control Parameter 5; In first accidental access response message, also comprised in addition random access guiding index 13 and and other parameters of this index correspondence such as TA etc., and RA-RNTI is 0X4352;
Step S404, terminal 1 is after receiving first accidental access response message, and the index by relatively RA-RNTI and random access guiding is identical with expectation, has determined to receive correct accidental access response message, and the rollback Control Parameter of upgrading this locality simultaneously is 5; Terminal 2 is after receiving first accidental access response message, and only having upgraded local rollback Control Parameter is 5,
Step S405, the base station sends second accidental access response message, does not wherein comprise the rollback Control Parameter, comprised random access guiding index 24 and and other parameters of this index correspondence such as TA etc., and RA-RNTI is 0X4352;
Step S406, terminal 2 index by random access guiding relatively and expectation identical when receiving second accidental access response message, determined to receive correct accidental access response message, do not comprise the rollback Control Parameter in the terminal judges accidental access response message, then keeping local rollback Control Parameter is 5.
In the said method, the time started of terminal receiving random access response can be identical with the concluding time of terminal transmission random access guiding message, also can be inequality.
Said method also is applicable in the accidental access response method, comprises that terminal sends random access guiding message to the base station; The random message that the base station is returned to terminal, and carry the rollback Control Parameter in first accidental access response message in terminal time of reception window; Whether the described accidental access response message of terminal judges comprises the rollback Control Parameter, if, the value of its rollback Control Parameter is updated to the value of the rollback Control Parameter that comprises in the described accidental access response message, otherwise, keep the value of its original rollback Control Parameter.
By said method, guaranteed that terminal obtains correct accidental access response parameter, and terminal has been simplified the operation of terminal as long as upgrade a rollback Control Parameter.
The above 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.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, a kind of update method of accidental access response parameter is characterized in that,
Terminal its rollback Control Parameter before the base station sends random access guiding message is set to initial value;
Described terminal is after the base station sends random access guiding message and receives the accidental access response message that returns the base station, whether comprise the rollback Control Parameter in the described accidental access response message of described terminal judges, if described terminal is updated to the value of its rollback Control Parameter the value of the rollback Control Parameter that comprises in the described accidental access response message; Otherwise described terminal keeps the value of its original rollback Control Parameter.
2, the method for claim 1 is characterized in that,
Carry the rollback Control Parameter in first accidental access response message in terminal time of reception window of described base station.
3, the method for claim 1 is characterized in that,
When described terminal is initial value in its rollback Control Parameter, on the next random access time slot behind the access failure at random, retransmit random access guiding message.
4, as claim 1 or 3 described methods, it is characterized in that,
The initial value of described rollback Control Parameter is 0.
5, a kind of accidental access response method is characterized in that,
Terminal sends random access guiding message to the base station;
Accidental access response message is returned to terminal in described base station, and carries the rollback Control Parameter in first accidental access response message in the time of reception window;
Whether the described accidental access response message of terminal judges comprises the rollback Control Parameter, if, the value of its rollback Control Parameter is updated to the value of the rollback Control Parameter that comprises in the described accidental access response message, otherwise, keep the value of its original rollback Control Parameter.
6, method as claimed in claim 5 is characterized in that,
Described terminal is before the base station sends random access guiding message, and its rollback Control Parameter is set to initial value.
7, method as claimed in claim 5 is characterized in that,
When described terminal is initial value in its rollback Control Parameter, on the next random access time slot behind the access failure at random, retransmit random access guiding message.
8, as claim 5,6 or 7 described methods, it is characterized in that,
The initial value of described rollback Control Parameter is 0.
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| WO2011160579A1 (en) * | 2010-06-21 | 2011-12-29 | 中兴通讯股份有限公司 | Random access method and system for realizing random access |
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