CN1747586A - Configuration and selection for subchannel of TD-SCDMA - Google Patents
Configuration and selection for subchannel of TD-SCDMA Download PDFInfo
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- CN1747586A CN1747586A CNA2004100095455A CN200410009545A CN1747586A CN 1747586 A CN1747586 A CN 1747586A CN A2004100095455 A CNA2004100095455 A CN A2004100095455A CN 200410009545 A CN200410009545 A CN 200410009545A CN 1747586 A CN1747586 A CN 1747586A
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Abstract
A method for configuring and choosing the sub-channel of TD-SCDMA, especially the up pilot channel in TD-SCDMA system, features that the resources of synchronous up sub-channel are allocated according to the access service priorities of user devices, and when the up synchronizing collision occurs the sub-channel resources able to be used for the low-priority user devices are decreased to ensure the access of high-priority user to network.
Description
Technical field
The present invention relates to subchannel arrangements and system of selection in a kind of communication system, especially relate to the configuration and the system of selection of sub channel resource of a kind of ascending pilot channel UpPCH of the TD_SCDMA of being used for wireless telecommunication system.
Background technology
TD_SCDMA is one of mainstream technology of 3-G (Generation Three mobile communication system), and what it adopted is the TDD technology, uplink and downlink is had synchronously requirement, the especially uplink synchronous of comparison strictness.In the TD-SCDMA system, defined UpPTS time slot and uplink synchronous code (SYNC_UL is also referred to as signature) specially and be used for uplink synchronous.Definition about the UpPCH subchannel in the 3GPP agreement is: a signature (signature subclass) and a plurality of subframe numbers.
What the TD-SCDMA system adopted is to compete access mechanism at random, and uplink synchronous is a step of random access procedure, is " access attempts at random ".Before carrying out the uplink synchronous process, UE (UserEquipment) has obtained down-going synchronous and has read broadcast message, has known available uplink synchronous code sign indicating number collection (having 8 at most) in the own residing sub-district.The basic step in the uplink synchronous of UE side that defines in the 3GPP agreement is as follows:
(1) setting signature retransmission counter M is Signature_Initial_Power with the signature transmitting power;
(2) UE chooses one randomly from the available UpPCH subchannel of given ASC (access service grade Access Service Class);
(3) send a signature with selected subchannel with the signature transmitting power;
(4) response of wait network side in the regular hour then;
(5) if do not obtain the response of network side, be not under 0 the situation then at the signature retransmission counter, promote transmitting power, and once more from step (2); As the retransmission counter of signing is 0, then to MAC layer report access failure;
(6), then insert successfully to the MAC report if obtain the response of network side.
Whether the uplink synchronous process that the success rate that the TD-SCDMA system inserts at random depends primarily on UE is successful.If UE has used identical subchannel, then can cause conflict, can not get the response of base station.
Simultaneously, this access mechanism of competing at random, when the TD-SCDMA power system capacity was little, the possibility that bumps was less; But in " overloading characteristic suggestion frequently " that TD alliance proposes, the sub-district adopts multicarrier to cover down, the number of users that holds in the sub-district significantly increases, and system only sends DwPTS, UpPTS and system information on main carrier frequency, and promptly the user only can insert at main carrier frequency.In this case, if available sub channel resource can not reasonable distribution, then will cause the possibility of collision conflict in the UE random access procedure to increase greatly, mobile communication system inserts the bottleneck that may become wireless access at random, thereby has influenced the service quality of whole network.
Summary of the invention
Technical problem to be solved by this invention is to provide the subchannel arrangements and the system of selection of a kind of TD_SCDMA system, be when in random access procedure, carrying out uplink synchronous, (ASC has 0～7 grade according to the ASC of UE, wherein the highest grade of ASC0, in turn grade reduces, and the grade of ASC7 is minimum.) reasonably distribute the sub channel resource of its uplink synchronous, reduce the possibility that conflict takes place as far as possible, can be under the situation of random access resource anxiety, guarantee the user's that the ASC grade is high access success rate as far as possible, especially when cell capacity is big, require the business of access network to increase simultaneously, the possibility of uplink synchronous collision conflict increases, by method of the present invention, the just preferential high user priority of grade that guarantees uses network in the UE initial access network.
To achieve these goals, the invention provides the subchannel arrangements and the system of selection of a kind of TD-SCDMA system, the ascending pilot channel that is used for the TD-SCDMA system, its characteristics are, the sub channel resource of just distributing its uplink synchronous according to the access service grade of subscriber equipment, by when the uplink synchronous conflict takes place, the trial that reduces the junior subscriber equipment of access service inserts the available subchannels resource that number of times reduces the junior subscriber equipment of access service, uses network to ensure the high user priority of access service grade.
The subchannel arrangements and the system of selection of above-mentioned TD-SCDMA system, its characteristics are, may further comprise the steps:
Subscriber equipment is provided with the available subchannels resource of acquiescence;
System just is each access service grade configuration available subchannels resource according to the access service grade of subscriber equipment;
Whether the judgement subscriber equipment belongs to is attempted uplink synchronous for the first time;
If attempt uplink synchronous for the first time, then subscriber equipment selects a subchannel to carry out uplink synchronous randomly from the sub channel resource of acquiescence;
If not attempting uplink synchronous for the first time, then subscriber equipment in the access service grade sub channel resource from system broadcast information, is determined the sub channel resource that it is available according to its access service grade;
From sub channel resource, select a subchannel to carry out the transmission of uplink synchronous code randomly.
The subchannel arrangements and the system of selection of above-mentioned TD-SCDMA system, its characteristics are, this system just comes in the step for the available sub channel resource of each access service grade configuration according to the access service grade of subscriber equipment, its distribution method be with the access service grade 0～7 totally 8 grades be divided into 3 ranks:
It is other that access service class 4～7 are all the minimum third level of rank, just available when subframe numbers SFN ' satisfies its mould 4 respectively and is respectively 0,1,2,3 (satisfy SFN ' mod 2=0, just available 1,2,3 the time).
The subchannel arrangements and the system of selection of above-mentioned TD-SCDMA system, its characteristics are that the available subchannels resource that described subscriber equipment is provided with acquiescence is meant that the user can use arbitrary subframe numbers to send uplink synchronous code.
The subchannel arrangements and the system of selection of above-mentioned TD-SCDMA system, its characteristics are, and be further comprising the steps of after sending uplink synchronous code:
Judge whether to obtain the response of network side;
If do not obtain the response of network side, then turn back to described judgement subscriber equipment and whether belong to step and the execution downwards of attempting uplink synchronous for the first time;
If obtain the response of network side, then explanation inserts successfully, finishes.
The subchannel arrangements and the system of selection of above-mentioned TD-SCDMA system, its characteristics are, for not being for the first time uplink synchronous or the response of after sending uplink synchronous code for the first time, not receiving network side, the system of selection of its subchannel is the access service grade according to subscriber equipment, in this set of sub-channels of determining, satisfy the probabilistic consistency principle, randomly from this subscriber equipment can with sub channel resource choose a subchannel, send a signature with selected subchannel with the signature transmitting power.
In the uplink synchronous process of TD-SCDMA standard, because uplink synchronous code resource is less, in the network development intermediary and later stages, under the bigger situation of power system capacity, the phenomenon of uplink synchronous collision conflict taking place easily, can not in time provide services on the Internet for the user.And by adopting the method for invention, with ASC and sub channel resource reasonable distribution, in case the uplink synchronous conflict takes place, the junior user's of ASC available subchannels resource will be reduced, promptly reduced the lower user of priority and taken place under the situation of access interference at random, thereby the number of times of repeatedly attempting ensures the high smooth access network of user of ASC grade.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the subchannel arrangements of TD-SCDMA of the present invention system and selects flow chart of steps;
Fig. 2 is the available subchannels resource schematic diagram of the service access grade of the present invention UE that is respectively ASC2 and ASC3.
Embodiment
Because used SYNC_UL sign indicating number collection is determined substantially in the UE uplink synchronous, mostly is 8 most; Therefore the main mode that avoids conflict is to send the selection of the subframe numbers of uplink synchronous code.Therefore, the present invention mainly is that (ASC has 0～7 grade, and wherein the highest grade of ASC0, and in turn grade reduces, and the grade of ASC7 is minimum for ASC according to UE.) reasonably distribute the sub channel resource of its uplink synchronous, reduce the possibility that conflict takes place as far as possible, when in random access procedure, carrying out uplink synchronous, guaranteed that the high user priority of ASC grade uses network.Especially when cell capacity is big, require the business of access network to increase simultaneously, when access interference takes place at random, by method of the present invention, when having guaranteed that high-grade user priority uses network, also carry out the number of times that uplink synchronous is attempted, thereby reduce the generation of collision by reducing the inferior grade user.
Below in conjunction with accompanying drawing, describe specific implementation method of the present invention in detail.
As shown in Figure 1, show the subchannel selection flow chart of steps far away of TD-SCDMA of the present invention system, comprise the steps:
Step 101, system is the available subchannel of each ASC configuration, and UE is provided with the sub channel resource of acquiescence.
In step 101, system is the available subchannel of each ASC configuration according to certain principle with method: the available subsets of sub-channels resource (subframe numbers) of the UE of different ASC is different.Concrete grammar is: with ASC0～7 totally 8 grades be further divided into 3 rank: ASC0 and ASC1 is all highest-ranking first rank, all subframe numbers are all available, promptly UE can initiate the uplink synchronous process at arbitrary sub-frame; ASC2 and ASC3 are all the second level that rank is taken second place, when subframe numbers satisfies SFN ' mod 2=0 respectively, can use 1 the time; Equally, for ASC4, ASC5, ASC6 and ASC7, it is other to be all the minimum third level of rank, when subframe numbers satisfy SFN ' mod 4=0 respectively, just available 1,2,3 the time.
Wherein, the corresponding relation such as the following table of ASC and available subframe numbers:
The subframe numbers that this ASC class user of X--can be used.
According to this method, the access service grade is respectively available subchannels subclass resource such as Fig. 2 of the UE of ASC2 and ASC3.That is to say that the user of ASC2 can be in subframe numbers SFN '=0,2,4,6,8 ... last transmission uplink synchronous code carries out uplink synchronous; Equally, the user of ASC3 can only be in SFN '=1,3,5,7,9 ... subframe on carry out uplink synchronous.
Step 102, UE prepares to carry out access attempts at random.
Does step 103 judge whether it is to attempt for the first time? be UE after having obtained down-going synchronous, having read broadcast message, as will inserting at random, initiate the uplink synchronous process, judge at first whether oneself is that uplink synchronous is attempted for the first time.If then execution in step 104, otherwise execution in step 105.
Step 104, if, then adopt the sub channel resource of acquiescence to begin the uplink synchronous process, promptly change step 106 over to.The sub channel resource of acquiescence is meant: do not consider the ASC of UE, only choose one randomly from available uplink synchronous code, send on arbitrary subframe.Like this, when UE carries out the first time during access attempts, the access chance of the UE of each ASC is impartial.
Step 105, if UE is not a uplink synchronous for the first time, or the response of not receiving network side after sending uplink synchronous code for the first time, then according to the ASC of UE, adopt this ASC in the system broadcasts can with sub channel resource begin the uplink synchronous process, promptly change step 106 over to.
Step 106 selects a subchannel to send signature from available sub channel resource.For not being for the first time uplink synchronous or the response of after sending uplink synchronous code for the first time, not receiving network side, ASC according to UE, in given set of sub-channels, satisfy the probabilistic consistency principle, randomly from this UE can with sub channel resource choose a subchannel, send a signature (SYNC_UL) with selected subchannel with the signature transmitting power.
Does step 107 judge whether to obtain the response of network side? if obtain, then finish; Otherwise chooser channel from available sub channel resource promptly goes back to step 103 again.
By adopting method of the present invention, carry out the number of times that uplink synchronous is attempted with reducing the inferior grade user, thereby ensure the success rate of high-grade user access network.This method is particularly useful under the more situation of number of network users, as the multicarrier replace mode.Because under this kind pattern, wish access network simultaneously, the number of users of enjoying the service of TD-SCDMA network increases, the possibility that clashes also just increases, so adopt the method for the present invention's suggestion,, can further improve the service quality of TD-SCDMA network from inserting on the success rate.
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.
Claims (6)
1, the subchannel arrangements and the system of selection of a kind of TD-SCDMA system, the ascending pilot channel that is used for the TD-SCDMA system, it is characterized in that, the sub channel resource of just distributing its uplink synchronous according to the access service grade of subscriber equipment, by when the uplink synchronous conflict takes place, the trial that reduces the junior subscriber equipment of access service inserts the available subchannels resource that number of times reduces the junior subscriber equipment of access service, uses network to ensure the high user priority of access service grade.
2, the subchannel arrangements and the system of selection of TD-SCDMA according to claim 1 system is characterized in that, may further comprise the steps:
Subscriber equipment is provided with the available subchannels resource of acquiescence;
System just is each access service grade configuration available subchannels resource according to the access service grade of subscriber equipment;
Whether the judgement subscriber equipment belongs to is attempted uplink synchronous for the first time;
If attempt uplink synchronous for the first time, then subscriber equipment selects a subchannel to carry out uplink synchronous randomly from the sub channel resource of acquiescence;
If not attempting uplink synchronous for the first time, then subscriber equipment in the access service grade sub channel resource from system broadcast information, is determined the sub channel resource that it is available according to its access service grade;
From sub channel resource, select a subchannel to carry out the transmission of uplink synchronous code randomly.
3, the subchannel arrangements and the system of selection of TD-SCDMA according to claim 2 system, it is characterized in that, this system just comes in the step for the available sub channel resource of each access service grade configuration according to the access service grade of subscriber equipment, its distribution method be with the access service grade 0～7 totally 8 grades be divided into 3 ranks:
Access service grade 0 and access service grade 1 are all first rank of highest level, and all subframe numbers are all available;
Access service grade 2 and access service grade 3 are all the second level that rank is taken second place, and have only when subframe numbers SFN ' satisfies and can use when its mould 2 is respectively 0,1;
It is other that access service class 4～7 are all the minimum third level of rank, just available when subframe numbers SFN ' satisfies its mould 4 respectively and is respectively 0,1,2,3.
According to the subchannel arrangements and the system of selection of claim 2 or 3 described TD-SCDMA systems, it is characterized in that 4, the available subchannels resource that described subscriber equipment is provided with acquiescence is meant that the user can use arbitrary subframe numbers to send uplink synchronous code.
5, according to the subchannel arrangements and the system of selection of claim 1 or 2 or 3 described TD-SCDMA systems, it is characterized in that, further comprising the steps of after sending uplink synchronous code:
Judge whether to obtain the response of network side;
If do not obtain the response of network side, then turn back to described judgement subscriber equipment and whether belong to step and the execution downwards of attempting uplink synchronous for the first time;
If obtain the response of network side, then explanation inserts successfully, finishes.
6, the subchannel arrangements and the system of selection of TD-SCDMA according to claim 5 system, it is characterized in that, for not being for the first time uplink synchronous or the response of after sending uplink synchronous code for the first time, not receiving network side, the system of selection of its subchannel is the access service grade according to subscriber equipment, in this set of sub-channels of determining, satisfy the probabilistic consistency principle, randomly from this subscriber equipment can with sub channel resource choose a subchannel, send a signature with selected subchannel with the signature transmitting power.
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| CNB2004100095455A CN100417275C (en) | 2004-09-10 | 2004-09-10 | Configuration and selection for subchannel of TD-SCDMA |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101835268A (en) * | 2010-04-06 | 2010-09-15 | 华为技术有限公司 | Method and device for terminals to select resident CDMA (Code Division Multiple Access) channels |
| CN101335539B (en) * | 2008-01-08 | 2011-11-16 | 上海交通大学 | Cochannel interference suppressing method between users and base station thereof |
| CN101742665B (en) * | 2008-11-05 | 2012-02-29 | 中兴通讯股份有限公司 | Method for sub-channelizing and mapping wireless resources |
| CN108882387A (en) * | 2018-09-28 | 2018-11-23 | 广东电网有限责任公司 | A kind of multi-service communication accidental access method and Related product |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5729542A (en) * | 1995-06-28 | 1998-03-17 | Motorola, Inc. | Method and apparatus for communication system access |
| DK1843622T3 (en) * | 2000-04-04 | 2010-04-26 | Sony Deutschland Gmbh | Event triggered access service class change in a randomized access channel |
| KR100403860B1 (en) * | 2000-12-27 | 2003-11-01 | 엘지전자 주식회사 | Method for RACH selection for collision decrease during connection attempt in IMT 2000 system |
| KR100662293B1 (en) * | 2000-12-30 | 2007-01-02 | 엘지전자 주식회사 | Method for Accessing random in Time Division Duplex Mode |
| KR100800866B1 (en) * | 2001-09-28 | 2008-02-04 | 삼성전자주식회사 | Method for selecting sub-channel in physical layer of umts user equipment |
| CN1260917C (en) * | 2002-12-03 | 2006-06-21 | 华为技术有限公司 | A control method for random access |
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2004
- 2004-09-10 CN CNB2004100095455A patent/CN100417275C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101335539B (en) * | 2008-01-08 | 2011-11-16 | 上海交通大学 | Cochannel interference suppressing method between users and base station thereof |
| CN101742665B (en) * | 2008-11-05 | 2012-02-29 | 中兴通讯股份有限公司 | Method for sub-channelizing and mapping wireless resources |
| CN101835268A (en) * | 2010-04-06 | 2010-09-15 | 华为技术有限公司 | Method and device for terminals to select resident CDMA (Code Division Multiple Access) channels |
| CN101835268B (en) * | 2010-04-06 | 2012-10-17 | 华为技术有限公司 | Method and device for terminals to select resident CDMA (Code Division Multiple Access) channels |
| CN108882387A (en) * | 2018-09-28 | 2018-11-23 | 广东电网有限责任公司 | A kind of multi-service communication accidental access method and Related product |
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| CN100417275C (en) | 2008-09-03 |
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