CN101188852A - Switching and network access method for mobile terminal - Google Patents
Switching and network access method for mobile terminal Download PDFInfo
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- CN101188852A CN101188852A CNA2006101451579A CN200610145157A CN101188852A CN 101188852 A CN101188852 A CN 101188852A CN A2006101451579 A CNA2006101451579 A CN A2006101451579A CN 200610145157 A CN200610145157 A CN 200610145157A CN 101188852 A CN101188852 A CN 101188852A
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Abstract
The invention relates to a movable termination switching switch-in network method which is used for marking and differentiating a condition code which is distributed and switched in a condition code set. The method includes the steps that a cell distributes the condition code and sets marks to a movable termination (3) which requests to be switched in the cell in the switching way according to a unique mark principle, the termination switches in through random switch-in message; a movable termination (2) requesting the initial switching-in from an idle state selects the condition code without an mark in the condition code set and switches in a network through a random switching-in message competition. The method uses the mark dynamic state to differentiate the switching switch-in and other random switch-in, a unique mark is used to ensure that the termination requesting switching switch-in at any moment can not initiate the same switching switch-in message in the same switching switch-in message component channel, thereby avoiding the impact among different termination switching switch-in messages and the movable termination identity which cannot be confirmed caused by the impact, reducing the switching time delay significantly and ensuring the communication quality.
Description
Technical field
The present invention relates to mainly by portable terminal, the cellular radio communication system that wireless access network and core net are formed is specifically related to a kind of switching and network access method for mobile terminal.
Background technology
In the cellular radio communication system, this system configuration such as Fig. 1, portable terminal 2 with network communication before, need send a message that inserts at random by a up common signal channel.This common signal channel is called Random Access Channel, and wherein network comprises wireless access network 1 and core net 3.The main purpose that portable terminal inserts at random is to obtain taking for the limited wireless channel resource by the mode of competing.Sometimes also be in order to obtain the synchronizing information of up direction.Uplink synchronous information is moved terminal with deciding when send up signal, makes upward signal drop in the signal reception time window of base station receiver.
In the cellular radio communication system channel can by sign indicating number branch, frequency division and the time multiple access technology that grades distinguish, the minimum unit of each channel on time domain is called frame.Be used as the frame of access at random or the combination of frame and be called random access time slot, the random access time slot on the same channel constitutes random access sub-channel in some way.In Fig. 2,3 frequencies and 3 channel code constitute 9 channels, the channel that constitutes such as No. 2 frequency f2 and No. 2 channel code C2.In per 6 frames, have a frame 120 that highlights with black to use as random access time slot on this channel, interval 5 frames between the random access time slot 120 have constituted a random access sub-channel 120 on this channel.In addition, also disposed random access sub-channel on the channel of No. 1 frequency and No. 1 channel code formation, so 2 random access sub-channels are arranged in this sub-district.
In order to guarantee the effective coverage range of initial random accessing message, the data rate of message itself is very low, and in other words the information bit that can comprise is very limited.Such as the long evolving system Long Term Evolution that discusses at 3GPP at present, be called for short LTE, in, the time slot at random that the asynchronous single frames of duration 0.5ms constitutes can carry the information that is no more than 10 bits.
Information bit in these random accessing messages is generally represented with the sequence number of the very high condition code of autocorrelation.In a random access time slot, wireless access network can be told the random accessing message that has comprised the different characteristic sign indicating number.So just can clash when only on identical random access time slot, receiving two random accessing messages with the same signature simultaneously.Conflict makes wireless access network can't go out independent portable terminal respectively, that is to say the angle from wireless access network, and effect duplicates in the access request of only receiving a portable terminal.In this case, need between portable terminal and the wireless access network, guarantee that one of them portable terminal successfully inserts by extra conflict settlement mechanism.The portable terminal of failure will come access of radio network by the mode of this competition again again.Conflict also can cause the portable terminal access failure of all conflicts sometimes.
This initial access process that begins from idle condition is prevailing a kind of reason the random access procedure.Also having a kind of prior reason is switching access procedure between the base station.
In portable terminal and network communication process, when portable terminal moves between different sub-districts, need to change wireless channel and keep in communication.If Target cell and cell-of-origin are in different base stations, a kind of possible switching mode is in handoff preparation phase, target BS has been prepared radio channel resource, is linked on the wireless channel that target BS distributed by source base station notice portable terminal then.This mode is for the system based on the dedicated wireless channel resource, and is such as GSM (global system for mobile communications), very effective; But for the wireless telecommunication system based on shared channel, such as LTE, this switching mode can increase the complexity of system, and makes the utilance of radio channel resource reduce.This be because source base station need switch know at first and target BS between time difference so that notice suitable time started of terminal be linked into target BS.And obtaining the very difficult of precise time difference, wireless access network need adopt the mechanism of more complicated to obtain this time difference.In addition because message in wireless access network or the time of on wave point, transmitting uncertain; how this reserves shared radio channel resource and becomes very difficult for target BS; reserve the utilization ratio that can reduce wireless channel too early; reserving party allows terminal miss turn-on time or introduces extra delay; so understand carrying out smoothly that the radio channel resource of reserved part redundancy guarantees to switch usually, reduced utilization ratio of wireless resources and do like this.。So generally can cannot not adopt predeterminedly the switching mode of radio channel resource, promptly portable terminal obtains radio channel resource at target BS by the mode that inserts at random of competing.Along with the technical development of cellular radio communication system, this process time that inserts at random is very short, such as in the LTE system, probably about 20ms.
Portable terminal inserts the delay of wireless access network by the mode that inserts at random all very important concerning which kind of inserts reason.But comparatively speaking, the cellular radio communication system is for switching the time delay that inserts, and just the delay requirement of handoff is strict more.When portable terminal moves between honeycomb, main and the most direct reason of switching is the edge that the signal of original Serving cell has dropped to a danger, if untimely wireless channel is switched to the better sub-district of signal, the communication quality of portable terminal will descend greatly so, even phenomenons such as call drop, interruption occur.For portable terminal, the same delay, beginning to introduce still to introduce under the business activity state from idle condition or inactive state has very big difference, and portable terminal is responsive more for the latter.And mainly cause by above-mentioned " conflict " phenomenon in the time delay of random access procedure, because conflict can cause having only a portable terminal access of radio network, even all portable terminals in the conflict are all failed.Even and the portable terminal of failure inserts successfully again, also produced more time delay.Based on switching the importance that inserts, need a kind of method to eliminate the collision probability of portable terminal when switching access.
The Chinese invention patent application that the present patent application people proposes in advance " a kind of distinction processing method of connection of mobile terminal into network " provides a kind of solution, its principal character is: fixing condition code collection and then the realization differentiated treatment of dividing, but divide because resource is fixing, lack flexibility, reduce systematic function.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of switching and network access method for mobile terminal, can preferentially eliminate the collision probability of portable terminal when switching inserts, reduce and switch the time delay that inserts, the while can more rationally be utilized condition code fund-raising source, increase flexibility, improve systematic function.
Above-mentioned technical problem of the present invention solves like this, and a kind of switching and network access method for mobile terminal is provided, and the reservation feature sign indicating number that inserts use is switched in specializing in that the use characteristic sign indicating number is concentrated, and may further comprise the steps:
1.1) sub-district switches the portable terminal (3) that inserts this sub-district by the request of giving of respective cell random access sub-channel unique identification principle and distribute not take the described reservation feature sign indicating number of mark and establish and take mark;
1.2) described portable terminal sends the random accessing message that contains described reservation feature sign indicating number by this random access sub-channel and switch access;
1.3) described portable terminal switches and insert successfully, removes the mark that takies of described reservation feature sign indicating number.
According to method provided by the invention, described step 1.3) comprises also in that described sub-district receives the portable terminal switch failure information, remove the mark that takies of described reservation feature sign indicating number.
According to method provided by the invention, described step 1.3) be to be requested the sub-district request of receiving to switch the switch failure information of passing in the cell-of-origin of the portable terminal that inserts, remove the mark that takies of described reservation feature sign indicating number.
According to method provided by the invention, described step 1.3) comprises in that described portable terminal goes into always success going into success or the changing-over of limiting time inscribe in the changing-over of limiting time inscribe, remove the mark that takies of described reservation feature sign indicating number.
According to method provided by the invention, described step 1.3) use timer, its value equals described limiting time.
According to method provided by the invention, described step 1.3) be to be requested the handoff completion message that the sub-district receives that portable terminal sends, remove the mark that takies of described reservation feature sign indicating number.
According to method for network access provided by the invention, described condition code is concentrated and is also comprised for other insert the general feature sign indicating number that uses except that switching access, comprise initial portable terminal that inserts of request and access network, still on up direction, lose synchronous portable terminal again.
According to method provided by the invention, describedly be access in the wireless telecommunication system that network is based on shared channel.
According to method provided by the invention, described wireless telecommunication system based on shared channel is the LTE Radio Network System.
According to method provided by the invention, described base station is made up of one or more sub-districts.
According to method provided by the invention, adopt message to carry out communication between described sub-district and the portable terminal.
Switching and network access method for mobile terminal provided by the invention, the mark dynamic area is cut changing-over and is gone into and other access at random, utilize the condition code unique identification request of the different band mark on the identical random access sub-channel to switch the portable terminal that inserts, can guarantee on radio network interface, require to switch the portable terminal of access constantly at any one, under the prerequisite that has been assigned with condition code, can on the identical time slot of identical random access sub-channel, not initiate identical switching and insert message, thereby avoided switching and inserted the possibility of conflicting between the message, also avoided switching access message and in definite portable terminal identity, caused ambiguity in the wireless access network side, certain degree ground has reduced handover delay, has guaranteed the quality of wireless telecommunications.
Description of drawings
Further the present invention is described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is a cellular radio communication system structural representation.
Fig. 2 is random access sub-channel and time slot schematic diagram.
Fig. 3 is a LTE system configuration schematic diagram.
Fig. 4 is LTE system random access sub-channel and time slot schematic diagram.
Fig. 5 is the process schematic diagram that the LTE system guarantees reservation feature sign indicating number uniqueness.
Embodiment
At first, the wireless access network that the cellular radio communication system in the inventive method is described is distinguished switching access and other the way that inserts at random:
(1) reserved part condition code, promptly the reservation feature sign indicating number is distributed to the portable terminal that requires to switch access separately, and is not allowed the portable terminal of other non-synchronized random access styles to select.
(2) all condition codes except the reservation feature sign indicating number, promptly the general feature sign indicating number can freely be selected by portable terminal, and prerequisite is that wireless access network does not distribute the reservation feature sign indicating number to these portable terminals.
(3) in the random accessing message above-mentioned condition code 1. and type implicit declaration 2. the access reason, condition code in certain random accessing message is a reservation feature sign indicating number, just show that current access reason is to switch to insert, therefore can distinguish to switch access and other access at random.
Second step, further specify assurance reservation feature sign indicating number in the inventive method use uniqueness, eliminate the intra-cell changing-over go between the possible way of conflict:
(1) if a plurality of random access sub-channels are arranged in the sub-district, condition code also can be reserved on a plurality of random access sub-channels so.When the reservation feature sign indicating number is distributed to the portable terminal of certain incision, need specify the random access sub-channel at this reservation feature sign indicating number place simultaneously.This is to insert on identical random access sub-channel for fear of the portable terminal that is assigned with identical reservation feature sign indicating number, thereby leads to a conflict.
(2) may in order to eliminate the conflict of switching between inserting, also need manage the reservation feature sign indicating number by wireless access network, make portable terminal switch between access periods, random access sub-channel that is adopted and reservation feature sign indicating number are in the scope of defined, such as unique in sub-district or the base station.Concrete way is as follows:
1. the portable terminal distribution reservation feature sign indicating number that inserts is switched in the target BS request of giving; and appointment random access sub-channel; if there are a plurality of random access sub-channels in this sub-district or base station; do a lock token for then this condition code; represent that this condition code is temporarily locked; before release, can't distribute to other portable terminal once more, and a protection timer is set.
2. target BS has only after the condition of confirming the condition code release, just can be to the condition code release of locking, and these conditions comprise:
1. Target cell is received the handoff completion message of portable terminal, the expression handover success
2. Target cell is received the switch failure information that the cell-of-origin sends
3. Target cell was not received about this portable terminal handover success or failure before the protection timer expiry of condition code.
The 3rd step, the distinguishing characteristics of general description the inventive method:
(1) the cellular mobile communication system is prior in the sub-district reserves the portable terminal use that a part of access features sign indicating number is at random distributed to the switching access separately, and the portable terminal selection that does not allow other non-synchronized random to insert.
(2) target BS can be provided with a protection timer after the portable terminal of switching access for request has distributed certain idle reservation feature sign indicating number.This reservation feature sign indicating number is no longer distributed to other portable terminal, and up to the definite portable terminal handover success that uses this reservation feature sign indicating number of Target cell, perhaps handoff failure is perhaps protected timer expiry.
(3) feature of feature (two) also is, when having distributed the reservation feature sign indicating number, also needs the random access sub-channel at specific characteristic sign indicating number place
At last, describe the present invention in detail with the inventive method using in the LTE system to example:
(1) at present the LTE system discussed of industry is a typical cellular formula wireless telecommunication system, structure as shown in Figure 3, this system is by portable terminal 2, base station 11 and core net 3 are formed, whether there is the connection of logic even physics between the base station 11, depends on the demand of network for mobile management.All base stations 11 all link to each other with core net 3.These base stations 11 have just constituted wireless access network 1.The RRM of its up-downgoing all is based on the thought of Channel Sharing, and unify to dispatch by base station 11.
The employing frequency division multiple access of LTE system is divided channel, and as shown in Figure 4,4 frequency bands have constituted 4 channels.The frame 120 that is used for inserting at random on each channel is called random access time slot 120, and the random access time slot of fixed interval has just constituted random access sub-channel 120 each other on a channel.Portable terminal is in initial access, and uplink synchronous all can insert at uplink random when switching between ascending resource request or the base station 11 and send random accessing message on the subchannel.In the message information bit of institute's load with the very high condition code of autocorrelation sequence number represent.
(2) typical case of the inventive method uses, corresponding process as shown in Figure 5, two random access sub-channel A and B are arranged in certain sub-district, the random access time slot of each random access sub-channel 8 condition codes of can decoding, wherein 0～No. 3 white condition code is the general feature sign indicating number; 4～No. 7 oblique lines or black condition code are kept for to switch and are inserted usefulness, and black is represented occupied, and oblique line is represented and can be used.
From t0 to t4, the seizure condition of A and B reservation feature sign indicating number is as follows on each time scale 20ms of being separated by, two random access sub-channels:
1. t0 constantly: No. 6 condition codes of random access sub-channel A and No. 7 condition codes of random access sub-channel B are occupied, other free time.Occupied condition code is set and is taken mark, and all is provided with corresponding protection timer.
2. t1 constantly: have a new portable terminal to require to switch to this sub-district again; Target cell is selected one does not have occupied condition code, and promptly random access sub-channel A No. 7 condition codes are distributed to this portable terminal; set then and take mark, the protection timer is set.
3. t2 constantly: message is received in this sub-district, says the portable terminal handoff failure of No. 6 condition codes that have been assigned with random access sub-channel A, and this condition code is recovered, and removes to take mark the corresponding protection timer that is also moving of deletion.
4. t3 constantly: message is received in this sub-district, says the portable terminal handover success of No. 7 condition codes that have been assigned with random access sub-channel A, and this condition code is recovered, and removes to take mark the corresponding protection timer that is also moving of deletion.Simultaneously there is a new portable terminal to require to switch to this sub-district again, has been assigned with No. 4 reservation feature sign indicating numbers of random access sub-channel B.
5. t4 constantly: the protection timer expiry of No. 7 condition codes of random access sub-channel B, the mark that takies of this condition code is unconditionally removed, and reclaims condition code.
This typical case uses the various basic conditions that comprise the actual use of the inventive method, guaranteed that the portable terminal that the request switching inserts in the actual use of the inventive method can use different reservation feature sign indicating numbers initiation switchings to insert, and has avoided the possibility of switching access interference on the identical random access sub-channel in sub-district.
Claims (7)
1. a switching and network access method for mobile terminal is characterized in that, the reservation feature sign indicating number that inserts use is switched in specializing in that the use characteristic sign indicating number is concentrated, and may further comprise the steps:
1.1) sub-district switches by the request of giving of respective cell random access sub-channel unique identification principle and insert
The portable terminal of this sub-district (3) distribution does not take the described reservation feature sign indicating number of mark and establishes and takies mark;
1.2) described portable terminal sends the random accessing message that contains described reservation feature sign indicating number by this random access sub-channel and switch access;
1.3) described portable terminal switches and insert successfully, removes the mark that takies of described reservation feature sign indicating number.
2. according to the described method for network access of claim 1, it is characterized in that described step 1.3) in comprise that also described sub-district receives the portable terminal switch failure information, remove the mark that takies of described reservation feature sign indicating number.
3. according to the described method for network access of claim 2, it is characterized in that described step 1.3) be to be requested the sub-district request of receiving to switch the switch failure information of passing in the cell-of-origin of the portable terminal that inserts, remove the mark that takies of described reservation feature sign indicating number.
4. according to the described method of claim 1, it is characterized in that described step 1.3) in comprise that described portable terminal goes into always success going into success or the changing-over of limiting time inscribe in the changing-over of limiting time inscribe, remove the mark that takies of described reservation feature sign indicating number.
5. according to the described method of claim 4, it is characterized in that described step 1.3) use timer, its value equals described limiting time.
6. according to the described method of claim 1, it is characterized in that described step 1.3) be to be requested the handoff completion message that the sub-district receives that portable terminal sends, remove the mark that takies of described reservation feature sign indicating number.
7. according to the described method of claim 1, it is characterized in that described condition code is concentrated and also comprised for other insert the general feature sign indicating number that uses except that switching access.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101451579A CN101188852A (en) | 2006-11-15 | 2006-11-15 | Switching and network access method for mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101451579A CN101188852A (en) | 2006-11-15 | 2006-11-15 | Switching and network access method for mobile terminal |
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| CNA2006101451579A Withdrawn CN101188852A (en) | 2006-11-15 | 2006-11-15 | Switching and network access method for mobile terminal |
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| CN102342167A (en) * | 2009-01-05 | 2012-02-01 | Lg电子株式会社 | A random access scheme to prevent unnecessary retransmission with its user equipment |
| US8687577B2 (en) | 2008-06-18 | 2014-04-01 | Lg Electronics Inc. | Method for transmitting MAC PDUs |
| US8934391B2 (en) | 2008-06-18 | 2015-01-13 | Optis Cellular Technology, Llc | Method for performing random access procedures and terminal thereof |
| US9049728B2 (en) | 2009-01-02 | 2015-06-02 | Lg Electronics Inc. | Random access scheme for user equipment |
| US9265070B2 (en) | 2008-06-18 | 2016-02-16 | Lg Electronics Inc. | Method for detecting failures of random access procedures |
| WO2017016484A1 (en) * | 2015-07-29 | 2017-02-02 | 索尼公司 | Wireless communication system, and base station side and user equipment side device and method |
| US10757650B2 (en) | 2008-06-18 | 2020-08-25 | Optis Cellular Technology, Llc | Method and mobile terminal for performing random access |
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2006
- 2006-11-15 CN CNA2006101451579A patent/CN101188852A/en not_active Withdrawn
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| US8971281B2 (en) | 2008-06-18 | 2015-03-03 | Lg Electronics Inc. | Method for transmitting MAC PDUs |
| US9432937B2 (en) | 2008-06-18 | 2016-08-30 | Optis Cellular Technology, Llc | Method for performing random access procedures and terminal thereof |
| US8934391B2 (en) | 2008-06-18 | 2015-01-13 | Optis Cellular Technology, Llc | Method for performing random access procedures and terminal thereof |
| US9900916B2 (en) | 2008-06-18 | 2018-02-20 | Lg Electronics Inc. | Method for detecting failures of random access procedures |
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| US10757650B2 (en) | 2008-06-18 | 2020-08-25 | Optis Cellular Technology, Llc | Method and mobile terminal for performing random access |
| US11272449B2 (en) | 2008-06-18 | 2022-03-08 | Optis Cellular Technology, Llc | Method and mobile terminal for performing random access |
| US9413507B2 (en) | 2008-06-18 | 2016-08-09 | Lg Electronics Inc. | Method for transmitting MAC PDUs |
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| US8687577B2 (en) | 2008-06-18 | 2014-04-01 | Lg Electronics Inc. | Method for transmitting MAC PDUs |
| US9265070B2 (en) | 2008-06-18 | 2016-02-16 | Lg Electronics Inc. | Method for detecting failures of random access procedures |
| US10349348B2 (en) | 2008-06-18 | 2019-07-09 | Optis Cellular Technology, Llc | Method and mobile terminal for performing random access |
| US9949282B2 (en) | 2008-06-18 | 2018-04-17 | Lg Electronics Inc. | Method for transmitting MAC PDUs |
| US9661527B2 (en) | 2008-06-18 | 2017-05-23 | Lg Electronics Inc. | Method for detecting failures of random access procedures |
| US9414412B2 (en) | 2009-01-02 | 2016-08-09 | Lg Electronics Inc. | Random access scheme for user equipment |
| US9049728B2 (en) | 2009-01-02 | 2015-06-02 | Lg Electronics Inc. | Random access scheme for user equipment |
| US9078236B2 (en) | 2009-01-05 | 2015-07-07 | Lg Electronics Inc. | Random access scheme for preventing unnecessary retransmission and user equipment for the same |
| CN102342167A (en) * | 2009-01-05 | 2012-02-01 | Lg电子株式会社 | A random access scheme to prevent unnecessary retransmission with its user equipment |
| CN102342167B (en) * | 2009-01-05 | 2014-08-06 | Lg电子株式会社 | Random access scheme and user equipment for preventing unnecessary retransmission |
| CN106413117A (en) * | 2015-07-29 | 2017-02-15 | 索尼公司 | Wireless communication system, and apparatus and method for base station side and user equipment side |
| WO2017016484A1 (en) * | 2015-07-29 | 2017-02-02 | 索尼公司 | Wireless communication system, and base station side and user equipment side device and method |
| US10462824B2 (en) | 2015-07-29 | 2019-10-29 | Sony Corporation | Wireless communication system, and base station side and user equipment side device and method |
| CN106413117B (en) * | 2015-07-29 | 2021-08-17 | 索尼公司 | Apparatus and method for wireless communication system, base station side and user equipment side |
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