CN102404864A - Method for avoiding random access conflict and mobile terminal for avoiding random access conflict - Google Patents
Method for avoiding random access conflict and mobile terminal for avoiding random access conflict Download PDFInfo
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- CN102404864A CN102404864A CN2010102873273A CN201010287327A CN102404864A CN 102404864 A CN102404864 A CN 102404864A CN 2010102873273 A CN2010102873273 A CN 2010102873273A CN 201010287327 A CN201010287327 A CN 201010287327A CN 102404864 A CN102404864 A CN 102404864A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
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Abstract
The invention discloses a method for avoiding a random access conflict and a mobile terminal for avoiding the random access conflict. The method comprises the following steps that: the mobile terminal estimates the downlink transmission time delay of a downlink signal by using a downlink synchronous signal, and analyzes an uplink transmission time delay carried in a random access response after the random access response is received; when the random access response is determined to respond to a random access request of the mobile terminal according to the downlink transmission time delay and the uplink transmission time delay, a message 3 is sent; and when the random access response is determined not to respond to the random access request of the mobile terminal according to the downlink transmission time delay and the uplink transmission time delay, a random access time is reselected, and random access is initiated. The method for avoiding the random access conflict and the mobile terminal for avoiding the random access conflict can reduce the conflicts in a process of randomly accessing so as to reduce the time for users to randomly access, and increase the utilization ratio of frequency spectrums.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to and carry out method and the portable terminal that access interference is at random evaded.
Background technology
At current Long Term Evolution (Long-Term Evolution; Abbreviation LTE) in the agreement of Release 8, strengthens Node B (Enhanced NodeB is called for short eNB) when detecting the lead code (preamble) of user's transmission; For certain targeting sequencing, strengthen Node B and in detection window, do coherent detection.Correlation peak in detection window surpasses certain thresholding, thinks that then having the user to use this targeting sequencing to do at random inserts.But, in actual scene, have a plurality of users and go up the same targeting sequencing of transmission at same Resource Block (Resource Block) simultaneously.Strengthen Node B so in theory and can in the window of this targeting sequencing, detect a plurality of correlation peaks.Strengthen Node B and only one in detection window correlation peak that surpasses thresholding is done accidental access response (random access response), promptly strengthen the correlation peak that Node B detects above thresholding and just return accidental access response in detection window to the user of correspondence.After the user initiates to insert at random, in case receive and corresponding to the accidental access response of leading ID itself, just according to a message 3 on the schedule information of wherein synch command and message 3 (message 3).
The deficiency of above-mentioned handling process is; Send out one simultaneously when leading as a plurality of users; May cause causing same frequency each other to disturb, the demodulation reliability of the user's of the real response that reduction eNB selects message 3 owing to there are a plurality of users on same running time-frequency resource, to send message 3 separately according to same mandate simultaneously; Prolong the turn-on time of interference user simultaneously, reduced the availability of frequency spectrum.
Summary of the invention
The technical problem that the present invention will solve provides carries out method and the portable terminal that access interference is at random evaded, and reduces the conflict in the random access procedure.
In order to solve the problems of the technologies described above; The invention provides a kind of method that access interference is at random evaded of carrying out; Comprise: portable terminal utilizes downlink synchronous signal to estimate the downlink transfer time delay of downstream signal; And after receiving accidental access response, parse the uplink time delay of carrying in the said accidental access response, when judging that according to said downlink transfer time delay and said uplink time delay said accidental access response is in response to the request of access at random of this portable terminal, send message 3; Otherwise, reselect to insert opportunity at random and initiate and insert at random.
Further, said method also has following characteristics:
Said portable terminal amount of compensating when sending targeting sequencing is under the situation of partial compensation for the time of said downlink transfer time delay; After receiving said accidental access response; The absolute difference of judging said downlink transfer time delay and uplink time delay judges that this accidental access response is in response to the request of access at random of this portable terminal during less than first error amount; Otherwise, judge that this accidental access response is not in response to the request of access at random of this portable terminal.
Further, said method also has following characteristics:
Said portable terminal amount of compensating when sending targeting sequencing is that the partial compensation for the time of said downlink transfer time delay is meant, the duration of revising synchronous adjustment amount and shifting to an earlier date said downlink transfer time delay sends said targeting sequencing.
Further, said method also has following characteristics:
Said portable terminal does not carry out under the situation of partial compensation for the time when sending targeting sequencing; After receiving said accidental access response; The absolute difference of twice value and uplink time delay of judging said downlink transfer time delay judges that this accidental access response is in response to the request of access at random of this portable terminal during less than second error amount; Otherwise, judge that this accidental access response is not in response to the request of access at random of this portable terminal.
Further, said method also has following characteristics:
Said first error amount and said second error amount are to make user's the probability of access interference at random be lower than the empirical value of presetting thresholding in the simulation process.
Further, said method also has following characteristics:
The value of said downlink transfer time delay is carried in the synch command word in the said accidental access response.
In order to solve the problems of the technologies described above; The present invention also provides a kind of portable terminal that access interference is at random evaded that carries out; Said portable terminal is used to utilize downlink synchronous signal to estimate the downlink transfer time delay of downstream signal, and after receiving accidental access response, parses the uplink time delay of carrying in the said accidental access response; When judging that according to said downlink transfer time delay and said uplink time delay said accidental access response is in response to the request of access at random of this portable terminal; Send message 3, otherwise, reselect to insert opportunity at random and initiate and insert at random.
Further, above-mentioned portable terminal also has following characteristics:
Said portable terminal; When the sending targeting sequencing amount of compensating of also being used for is under the situation of partial compensation for the time of said downlink transfer time delay; After receiving said accidental access response; The absolute difference of judging said downlink transfer time delay and uplink time delay judges that this accidental access response is in response to the request of access at random of this portable terminal during less than first error amount; Otherwise, judge that this accidental access response is not in response to the request of access at random of this portable terminal.
Further, above-mentioned portable terminal also has following characteristics:
Said portable terminal amount of compensating when sending targeting sequencing is that the partial compensation for the time of said downlink transfer time delay is meant, the duration of revising synchronous adjustment amount and shifting to an earlier date said downlink transfer time delay sends said targeting sequencing.
Further, above-mentioned portable terminal also has following characteristics:
Said portable terminal; Also be used for when sending targeting sequencing, not carrying out under the situation of partial compensation for the time; After receiving said accidental access response; The absolute difference of twice value and uplink time delay of judging said downlink transfer time delay judges that this accidental access response is in response to the request of access at random of this portable terminal during less than second error amount; Otherwise, judge that this accidental access response is not in response to the request of access at random of this portable terminal.
The present invention can reduce the conflict in the random access procedure, reduces user's turn-on time at random, improves the availability of frequency spectrum.
Description of drawings
Fig. 1 carries out the method sketch map that access interference is at random evaded among the embodiment;
Fig. 2 is that the user carries out under the partial compensation for the time situation, the sequential relationship sketch map when user and network carry out information interaction;
Fig. 3 is that the user does not carry out under the partial compensation for the time situation, the sequential relationship sketch map when user and network carry out information interaction.
Embodiment
Carrying out the portable terminal that access interference at random evades is used to utilize downlink synchronous signal to estimate the downlink transfer time delay of downstream signal; And after receiving accidental access response, parse the uplink time delay of carrying in the said accidental access response; When judging that according to said downlink transfer time delay and said uplink time delay said accidental access response is in response to the request of access at random of this portable terminal; Send message 3, otherwise, reselect to insert opportunity at random and initiate and insert at random.
Wherein, the value of downlink transfer time delay is carried in the synch command word in the said accidental access response.
Said portable terminal amount of compensating when sending targeting sequencing is under the situation of partial compensation for the time of said downlink transfer time delay; After receiving said accidental access response; The absolute difference of judging said downlink transfer time delay and uplink time delay judges that this accidental access response is in response to the request of access at random of this portable terminal during less than first error amount; Otherwise, judge that this accidental access response is not in response to the request of access at random of this portable terminal.
Wherein, portable terminal amount of compensating when sending targeting sequencing is that the partial compensation for the time of said downlink transfer time delay is meant, the duration of revising synchronous adjustment amount and shifting to an earlier date said downlink transfer time delay sends said targeting sequencing.
Said portable terminal does not carry out under the situation of partial compensation for the time when sending targeting sequencing; After receiving said accidental access response; The absolute difference of twice value and uplink time delay of judging said downlink transfer time delay judges that this accidental access response is in response to the request of access at random of this portable terminal during less than second error amount; Otherwise, judge that this accidental access response is not in response to the request of access at random of this portable terminal.
Wherein first error amount and second error amount are to make user's the probability of access interference at random be lower than the empirical value of presetting thresholding in the simulation process.
As shown in Figure 1; A kind ofly carry out the method that access interference at random evades and comprise: portable terminal utilizes downlink synchronous signal to estimate the downlink transfer time delay (t1) of downstream signal; And after receiving accidental access response, parse the uplink time delay (t2) of carrying in the said accidental access response; When judging that according to said downlink transfer time delay and said uplink time delay said accidental access response is in response to the request of access at random of this portable terminal; Send message 3, otherwise, reselect to insert opportunity at random and initiate and insert at random.
Wherein, the value of downlink transfer time delay is carried in the synch command word in the said accidental access response.
Portable terminal amount of compensating when sending targeting sequencing is under the situation of partial compensation for the time of said downlink transfer time delay, after receiving said accidental access response, judges said downlink transfer time delay t
1With uplink time delay t
2Absolute difference less than the first error amount Δ
1The time | t
1-t
2|≤Δ
1, judge that this accidental access response is in response to the request of access at random of this portable terminal; Otherwise, judge that this accidental access response is not in response to the request of access at random of this portable terminal.Wherein, portable terminal amount of compensating when sending targeting sequencing is that the partial compensation for the time of said downlink transfer time delay is meant, the duration of revising synchronous adjustment amount and shifting to an earlier date said downlink transfer time delay sends said targeting sequencing.
Portable terminal does not carry out under the situation of partial compensation for the time when sending targeting sequencing, after receiving said accidental access response, judges said downlink transfer time delay t
1Twice value and uplink time delay t
2Absolute difference less than the second error amount Δ
2The time | 2 * t
1-t
2|≤Δ
2, judge that this accidental access response is in response to the request of access at random of this portable terminal; Otherwise, judge that this accidental access response is not in response to the request of access at random of this portable terminal.
As shown in Figure 2, portable terminal has carried out under the situation of partial compensation for the time when sending targeting sequencing, and the time delay of carrying the upstream message of targeting sequencing has included only One Way Delay.As shown in Figure 3, portable terminal does not carry out under the situation of partial compensation for the time when sending targeting sequencing, and the time delay of carrying the upstream message of targeting sequencing comprises two-way time delay.The first error amount Δ
1With the second error amount Δ
2Introduce as amount of redundancy, to guarantee flase drop and omission can not to occur.The first error amount Δ
1With the second error amount Δ
2Be to make user's the probability of access interference at random be lower than the empirical value of presetting thresholding in the simulation process.
The introducing of above-mentioned condition judgment step among the present invention, whether the accidental access response that the user is accurately known receive is in response to the access at random that it sends.Thereby the conflict in the minimizing random access procedure, improves the availability of frequency spectrum at minimizing user's turn-on time at random.
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Specific embodiment one
Step S101, user utilize downlink synchronous signal to estimate downlink transfer time-delay t
1
It is t that step S102, user carry out duration
1Partial compensation for the time after, on send out random access guiding.
Step S103, user's receiving random access response is resolved the downlink transfer time delay t in the wherein one's own accidental access response
2
Step S104 judges t
1And t
2Relation, satisfy | t
1-t
2|≤Δ
1
Step S105, this user sends message 3 according to the authorization message of accidental access response.
Specific embodiment two
Step S201, user utilize downlink synchronous signal to estimate downlink transfer time-delay t
1
It is t that step S202, user carry out duration
1Partial compensation for the time after, on send out random access guiding.
Step S203, user's receiving random access response is resolved the downlink transfer time delay t in the wherein one's own accidental access response
2
Step S204 judges t
1And t
2Relation, do not satisfy | t
1-t
2|≤Δ
1
Step S205 after this user keeps out of the way, reselects at random and inserts constantly, does at random and inserts.
Specific embodiment three
Step S301, user utilize downlink synchronous signal to estimate downlink transfer time-delay t
1
Step S302, the user does not carry out partial compensation for the time, on send out random access guiding.
Step S303, user's receiving random access response is resolved the downlink transfer time delay t in the wherein one's own accidental access response
2
Step S304 judges t
1And t
2Relation, satisfy | 2 * t
1-t
2|≤Δ
2
Step S305, this user sends message 3 according to the authorization message of accidental access response.
Specific embodiment four
Step S401, user utilize downlink synchronous signal to estimate downlink transfer time-delay t
1
Step S402, the user does not carry out partial compensation for the time, on send out random access guiding.
Step S403, user's receiving random access response is resolved the downlink transfer time delay t in the wherein one's own accidental access response
2
Step S404 judges t
1And t
2Relation, do not satisfy | 2 * t
1-t
2|≤Δ
2
Step S405 after this user keeps out of the way, reselects at random and inserts constantly, does at random and inserts.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (10)
1. one kind is carried out the method that access interference is at random evaded, it is characterized in that,
Portable terminal utilizes downlink synchronous signal to estimate the downlink transfer time delay of downstream signal; And after receiving accidental access response, parse the uplink time delay of carrying in the said accidental access response; When judging that according to said downlink transfer time delay and said uplink time delay said accidental access response is in response to the request of access at random of this portable terminal; Send message 3, otherwise, reselect to insert opportunity at random and initiate and insert at random.
2. the method for claim 1 is characterized in that,
Said portable terminal amount of compensating when sending targeting sequencing is under the situation of partial compensation for the time of said downlink transfer time delay; After receiving said accidental access response; The absolute difference of judging said downlink transfer time delay and uplink time delay judges that this accidental access response is in response to the request of access at random of this portable terminal during less than first error amount; Otherwise, judge that this accidental access response is not in response to the request of access at random of this portable terminal.
3. method as claimed in claim 2 is characterized in that,
Said portable terminal amount of compensating when sending targeting sequencing is that the partial compensation for the time of said downlink transfer time delay is meant, the duration of revising synchronous adjustment amount and shifting to an earlier date said downlink transfer time delay sends said targeting sequencing.
4. the method for claim 1 is characterized in that,
Said portable terminal does not carry out under the situation of partial compensation for the time when sending targeting sequencing; After receiving said accidental access response; The absolute difference of twice value and uplink time delay of judging said downlink transfer time delay judges that this accidental access response is in response to the request of access at random of this portable terminal during less than second error amount; Otherwise, judge that this accidental access response is not in response to the request of access at random of this portable terminal.
5. the method for claim 1 is characterized in that,
Said first error amount and said second error amount are to make user's the probability of access interference at random be lower than the empirical value of presetting thresholding in the simulation process.
6. the method for claim 1 is characterized in that,
The value of said downlink transfer time delay is carried in the synch command word in the said accidental access response.
7. one kind is carried out the portable terminal that access interference is at random evaded, it is characterized in that,
Said portable terminal; Be used to utilize downlink synchronous signal to estimate the downlink transfer time delay of downstream signal; And after receiving accidental access response, parse the uplink time delay of carrying in the said accidental access response, when judging that according to said downlink transfer time delay and said uplink time delay said accidental access response is in response to the request of access at random of this portable terminal, send message 3; Otherwise, reselect to insert opportunity at random and initiate and insert at random.
8. portable terminal as claimed in claim 7 is characterized in that,
Said portable terminal; When the sending targeting sequencing amount of compensating of also being used for is under the situation of partial compensation for the time of said downlink transfer time delay; After receiving said accidental access response; The absolute difference of judging said downlink transfer time delay and uplink time delay judges that this accidental access response is in response to the request of access at random of this portable terminal during less than first error amount; Otherwise, judge that this accidental access response is not in response to the request of access at random of this portable terminal.
9. portable terminal as claimed in claim 8 is characterized in that,
Said portable terminal amount of compensating when sending targeting sequencing is that the partial compensation for the time of said downlink transfer time delay is meant, the duration of revising synchronous adjustment amount and shifting to an earlier date said downlink transfer time delay sends said targeting sequencing.
10. portable terminal as claimed in claim 7 is characterized in that,
Said portable terminal; Also be used for when sending targeting sequencing, not carrying out under the situation of partial compensation for the time; After receiving said accidental access response; The absolute difference of twice value and uplink time delay of judging said downlink transfer time delay judges that this accidental access response is in response to the request of access at random of this portable terminal during less than second error amount; Otherwise, judge that this accidental access response is not in response to the request of access at random of this portable terminal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102873273A CN102404864A (en) | 2010-09-16 | 2010-09-16 | Method for avoiding random access conflict and mobile terminal for avoiding random access conflict |
| PCT/CN2011/074559 WO2012034410A1 (en) | 2010-09-16 | 2011-05-24 | Method and mobile terminal for avoiding random access collision |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102873273A CN102404864A (en) | 2010-09-16 | 2010-09-16 | Method for avoiding random access conflict and mobile terminal for avoiding random access conflict |
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| CN102404864A true CN102404864A (en) | 2012-04-04 |
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| CN2010102873273A Pending CN102404864A (en) | 2010-09-16 | 2010-09-16 | Method for avoiding random access conflict and mobile terminal for avoiding random access conflict |
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| WO (1) | WO2012034410A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106793150A (en) * | 2016-12-14 | 2017-05-31 | 北京小米移动软件有限公司 | The method for building up and terminal of Radio Link |
| CN110268795A (en) * | 2019-02-14 | 2019-09-20 | 北京小米移动软件有限公司 | Random accessing message transmission method, device and storage medium |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103384173A (en) * | 2013-01-07 | 2013-11-06 | 沈阳远方计控系统有限公司 | Interference signal avoiding method of wireless remote transmission multi-frequency point set copy system |
| CN106961713B (en) * | 2016-01-12 | 2021-07-09 | 中兴通讯股份有限公司 | Uplink access method, terminal and base station |
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| JP2008271137A (en) * | 2007-04-19 | 2008-11-06 | Nippon Telegr & Teleph Corp <Ntt> | Radio access system, base station device and subscriber station device |
| CN101478780A (en) * | 2008-01-04 | 2009-07-08 | 中兴通讯股份有限公司 | Method for random access in cellular communication system |
| CN101589566A (en) * | 2007-06-18 | 2009-11-25 | Lg电子株式会社 | Method of performing uplink synchronization in wireless communication system |
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| JP2008271137A (en) * | 2007-04-19 | 2008-11-06 | Nippon Telegr & Teleph Corp <Ntt> | Radio access system, base station device and subscriber station device |
| CN101589566A (en) * | 2007-06-18 | 2009-11-25 | Lg电子株式会社 | Method of performing uplink synchronization in wireless communication system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793150A (en) * | 2016-12-14 | 2017-05-31 | 北京小米移动软件有限公司 | The method for building up and terminal of Radio Link |
| CN106793150B (en) * | 2016-12-14 | 2020-01-07 | 北京小米移动软件有限公司 | Wireless link establishing method and terminal |
| CN110268795A (en) * | 2019-02-14 | 2019-09-20 | 北京小米移动软件有限公司 | Random accessing message transmission method, device and storage medium |
| WO2020164058A1 (en) * | 2019-02-14 | 2020-08-20 | 北京小米移动软件有限公司 | Random access message transmission method, apparatus, and storage medium |
| CN110268795B (en) * | 2019-02-14 | 2023-05-02 | 北京小米移动软件有限公司 | Random access message transmission method, device and storage medium |
| US11963233B2 (en) | 2019-02-14 | 2024-04-16 | Beijing Xiaomi Mobile Software Co., Ltd. | Method and device for transmitting a random access message, and a storage medium |
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| Publication number | Publication date |
|---|---|
| WO2012034410A1 (en) | 2012-03-22 |
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Application publication date: 20120404 |