CN1838574B - TDD-CDMA system random access method - Google Patents
TDD-CDMA system random access method Download PDFInfo
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- CN1838574B CN1838574B CN2005100601150A CN200510060115A CN1838574B CN 1838574 B CN1838574 B CN 1838574B CN 2005100601150 A CN2005100601150 A CN 2005100601150A CN 200510060115 A CN200510060115 A CN 200510060115A CN 1838574 B CN1838574 B CN 1838574B
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Abstract
This invention relates to a time-division duplex CDMA system and its random connection method, which includes upper pilot time gap and autograph used for ascending synchronization, wherein ascending pilot time gap is N ascending synchronization channels, the numbering is from 0 to N-1; the number N can be collocated by system; the value zone of N is 1,2,4,8; the i ascending synchronization channelof the ascending pilot time gap must satisfy the following conditions:SFN'mod N=i,wherein SFN' is used to compute child frame number, when the system frame number SFN=0, SFN' is arranged to 0, this invention can solve the problem that the autograph used in random connection course and UpPTS time gap source' definition and choosing method are inconsistent with the collocation method.
Description
Technical field
The present invention relates to 3-G (Generation Three mobile communication system), especially the accidental access method of time-division duplex (TD-SCDMA) communication system.
Background technology
Random access procedure is a significant process in the wireless telecommunication system, it is the important step in the wireless access process, in the TD-SCDMA of one of 3-G (Generation Three mobile communication system) wireless telecommunication system, random access procedure has comprised important uplink synchronous process especially.
What the TD-SCDMA system adopted is the synchronous time-division duplex technology, uplink and downlink is had synchronously requirement, the especially uplink synchronous of comparison strictness.In the TD-SCDMA system, defined uplink pilot time slot (UpPTS) specially and uplink synchronous code (SYNC_UL) is used for uplink synchronous.
In the TD-SCDMA system, random access procedure is a physical layer procedure, and in this process, a critical step is exactly the selection of carrying out uplink synchronous code and launching opportunity at the UpPTS time slot.This selection course is not only the needs of uplink synchronous process, the more important thing is, this selection course is the essential place of random access procedure, and this selection course has embodied a concentrated reflection of uplink common channel resource in the random access procedure---the shared method of salary distribution of competition of Physical Random Access Channel (PRACH).
In the TD-SCDMA system, a cell configuration has 8 uplink synchronous codes, is numbered 0～7, and in random access procedure, uplink synchronous code also is described to signature (signature).In random access procedure,, thereby cause the random access procedure failure if terminal equipment (UE) has been selected identical signature and on same opportunity, i.e. the UpPTS time slot of same subframe emission then can cause conflict, can not get the response of base station.
In the TD-SCDMA system, by defining different access service grade ASC (Access ServiceClass), and each ASC disposes corresponding resource, realizes different access service quality.In the TD-SCDMA system, be provided with 0～7 totally 8 grades of ASC, in the resource of system, comprise signature and the UpPTS time interval resource (the UpPTS time interval resource is exactly the emission opportunity at the UpPTS time slot) that uses in the random access procedure for each ASC configuration.Simultaneously, in the UE side, system definition 0～15 totally 16 grades of access grade AC (Access Class), to each UE one or more AC can be set.In system broadcast message, system is to the ASC of UE broadcast configuration number and be the signature and the UpPTS time interval resource of each ASC configuration, broadcasts the corresponding relation between AC and the ASC simultaneously.UE determines UE ASC value with use in random process, and further determines operable signature and UpPTS time interval resource in random process according to this corresponding relation with the AC value that wherein is provided with.
To the TD-SCDMA system, at present up-to-date 3GPP agreement " 3GPP TS 25.224V6.3.0 ", definition UpPCH (uplink synchronous channel) subchannel is: a UpPCH subchannel is defined as one (perhaps one group) signature and some UpPTS subframes.In this definition, UpPCH subchannel by subframe definition the UpPTS time interval resource, a UpPCH subchannel has defined the signature and the UpPTS time interval resource that will use in the random process simultaneously.Therefore, in random access procedure subsequently, the selection course that has defined signature and UpPTS time interval resource is as follows:
■ selects a UpPCH subchannel at random from the UpPCH subchannel that given ASC can use.
Random function will make each option have the identical possibility of choosing.
To the TD-SCDMA system, in the broadcast message of at present up-to-date agreement " 3GPP TS 25.331V6.4.0 ", the configuration of signature and UpPTS time interval resource is to realize by ASC configuration information unit, its structural representation as shown in Figure 1, corresponding each ASC value, comprise available uplink synchronous code (i.e. signature) and subchannel number and available subchannel, subchannel wherein is exactly the UpPTS time interval resource.In this collocation method, will sign and the UpPTS time interval resource is configured as two kinds of resources independently.
From above-mentioned analysis as can be known, in belonging to two agreements of 3GPP agreement together, in definition and the use thereof of agreement " 3GPP TS 25.224V6.3.0 ", and between the collocation method of agreement " 3GPP TS 25.331V6.4.0 ", there is inconsistent place to signature and UpPTS time interval resource about signature and UpPTS time interval resource.This inconsistent will causing: on the one hand, by agreement " 3GPP TS 25.331V6.4.0 " to signature and UpPTS time interval resource when being configured, at a loss as to what to do; On the other hand, system is by the configuration information of agreement " 3GPP TS 25.331V6.4.0 " to signature and UpPTS time interval resource, UE can not understand configuration information according to definition and using method in the agreement " 3GPP TS 25.224V6.3.0 ", and configuration information does not play due effect.UE is in nondeterministic statement to the signature and the using method of UpPTS time interval resource when carrying out random access procedure, broken away from the control of system.Like this, in the TD-SCDMA system, above-described system controls the different different access service method for quality of UE realization and just can not realize by disposing different ASC and corresponding signature and UpPTS time interval resource.
Summary of the invention
The technical problem that the present invention solves be exist between the collocation method to signature and UpPTS time interval resource in the prior art inconsistent, thereby cause system to control the different different access service quality of UE realization by disposing different ASC and corresponding signature and UpPTS time interval resource.
In order to solve above-mentioned technical problem, the present invention proposes a kind of accidental access method, may further comprise the steps:
1) the terminal equipment side physical layer is received the Random Access Channel emission request of media access control layer, triggering the physical layer random access procedure begins, media access control layer is imported following information: the transformat that Physical Random Access Channel message is used, the access service grade of random access procedure, the data of transmission;
2) terminal equipment selects one to insert transmission channel at random according to the transformat of media access control layer indication uniquely;
3) select a uplink synchronous subchannel and a signature at random the uplink synchronous subchannel that can use from given access service grade respectively of terminal equipment and the signature, random function wherein makes each option have the identical possibility of choosing;
4) terminal equipment is determined suitable transmission power, emission signature on the uplink synchronous subchannel of selecting;
5) terminal equipment selects to monitor the forward physical access channel;
6) terminal equipment receives network side admission confirm information on the forward physical access channel, and uplink synchronous is finished, and selects the information on the Physical Random Access Channel transmission Random Access Channel.
If access interference at random takes place, perhaps on the forward physical access channel, do not receive network side admission confirm information at described step 6 terminal equipment, then return step 3.
If access interference at random takes place, perhaps on the forward physical access channel, do not receive network side admission confirm information at described step 6 terminal equipment, then terminal equipment is signed when retransmitting, from the signature that given access service grade can be used, select a signature again at random, the uplink synchronous subchannel is constant, returns step 4.
If access interference at random takes place, perhaps on the forward physical access channel, do not receive network side admission confirm information at described step 6 terminal equipment, then terminal equipment is signed when retransmitting, from the uplink synchronous subchannel that given access service grade can be used, select a uplink synchronous subchannel again at random, it is constant to sign, and returns step 4.
The invention has the beneficial effects as follows: uplink pilot time slot and uplink synchronous subchannel in the TD-SCDMA of the present invention system clearly dispose, and provide corresponding accidental access method, solved in the present agreement of 3GPP about the TD-SCDMA wireless telecommunication system, the signature that random access procedure uses and definition and the system of selection and the inconsistent problem of collocation method of UpPTS time interval resource, on the one hand, the system that makes can carry out proper configuration to signature and UpPTS time interval resource by agreement " 3GPP TS 25.331V6.4.0 "; On the other hand, make the configuration that understanding system that UE can be correct carries out signature and UpPTS time interval resource, and use signature and UpPTS time interval resource according to configuration information, system's control UE use is signed and the purpose of UpPTS time interval resource thereby reach.Simultaneously, can control UE use signature and UpPTS time interval resource just because of system, the system that makes can control the different different access service quality of UE realization with the UpPTS time interval resource by disposing different ASC and corresponding signature.
Description of drawings
Fig. 1 is the structural representation of ASC configuration information unit
The UpPCH subchannel schematic diagram of the UpPTS time slot in Fig. 2 system of the present invention when N=8
Fig. 3 is the embodiment flow chart of UE side accidental access method of the present invention
Embodiment
Below in conjunction with accompanying drawing specific implementation of the present invention is made a detailed description.
Be the UpPCH subchannel schematic diagram of the UpPTS time slot of TD-SCDMA of the present invention system as shown in Figure 2, the number N of UpPCH subchannel is configured to 8 in this example, and uplink pilot time slot comprises 8 subchannels, numbering from 0 to 7.
When SFN ' mod 8=0, the UpPTS time slot of this subframe is the 0th subchannel;
When SFN ' mod 8=1, the UpPTS time slot of this subframe is the 1st subchannel;
When SFN ' mod 8=7, the UpPTS time slot of this subframe is the 7th subchannel;
Wherein SFN is the System Frame Number that is used to count frame number, and span is 0～4095, and each radio frames of SFN increases by 1, and between 0～4095 cycle count.
SFN ' is for being used to count the subframe numbers of number of sub frames, and each wireless sub-frame increases by 1, and when the frame of system frame number SFN=0 began, SFN ' was arranged to 0.In the TD-SCDMA system, a radio frames comprises two wireless sub-frames.
In the present invention,, be configured to the UpPTS time interval resource relevant with subframe with the UpPCH subchannel in the TD-SCDMA system, and UpPCH sub channel resource and signature resources in the random access procedure is independent.In random access procedure, the selection of signature and sub channel resource is selected respectively independently at random, and, access interference is at random taking place, and when UE carries out the uplink synchronous code repeating transmission at every turn, is also needing to select at random respectively a UpPCH subchannel and a signature, perhaps the UpPCH subchannel is constant, only select a signature at random, it is constant perhaps to sign, and only selects a UpPCH subchannel at random.On the collocation method of UpPCH sub channel resource and signature resources, still adopt the collocation method in the present agreement " 3GPP TS 25.331V6.4.0 ", signature and UpPCH sub channel resource independently is configured respectively in ASC configuration information unit.
The idiographic flow of UE side accidental access method is as follows as shown in Figure 3:
1) UE side physical layer is received Random Access Channel (RACH) the emission request of media access control layer MAC (Media Access Control), triggers the physical layer random access procedure and begins, and the information of MAC layer input comprises: the transformat that PRACH message is used; The access service grade ASC of random access procedure; The data (transport block set) of transmission;
2) according to the transformat of MAC layer indication, select a RACH transmission channel uniquely;
3) select a subchannel according to ASC: its system of selection is to select a UpPCH subchannel, random function wherein will make each option have the identical possibility of choosing from the UpPCH subchannel that given ASC can use at random;
4) select a signature according to ASC: its system of selection is to select a signature, random function wherein will make each option have the identical possibility of choosing from the signature that given ASC can use at random;
5) emission signature on the subchannel of selecting;
6) select to monitor forward physical access channel (FPACH);
7) judge whether on the FPACH channel, to receive network side admission confirm information; If do not receive, jump to the 3rd) step or the 4th) step; If receive, then jumped to for the 8th step;
8) uplink synchronous is finished, and selects the information on the PRACH physical channel transmission RACH channel.
9) process finishes.
Top step 3) and 4) can exchange, that is to say and to select signature to select the UpPCH subchannel more earlier.
Claims (7)
1. the accidental access method of a TDD-CDMA system is characterized in that may further comprise the steps:
5.1) the terminal equipment side physical layer receives the Random Access Channel emission request of media access control layer, triggering the physical layer random access procedure begins, media access control layer is imported following information: the transformat that Physical Random Access Channel message is used, the access service grade of random access procedure, the data of transmission;
5.2) terminal equipment is according to the transformat of media access control layer indication, selects a Random Access Channel uniquely;
5.3) select a uplink synchronous subchannel and a uplink synchronous code at random the uplink synchronous subchannel that can use from given access service grade respectively of terminal equipment and the uplink synchronous code, random function wherein makes each option have the identical possibility of choosing;
5.4) terminal equipment determines suitable transmission power, launches uplink synchronous code on the uplink synchronous subchannel of selecting;
5.5) terminal equipment selection monitoring forward physical access channel;
5.6) terminal equipment receives network side admission confirm information on the forward physical access channel, uplink synchronous is finished, and selects Physical Random Access Channel to send information on the Random Access Channel.
2. the accidental access method of TDD-CDMA system as claimed in claim 1, it is characterized in that, if access interference at random takes place, perhaps on the forward physical access channel, do not receive network side admission confirm information at described step 5.6 terminal equipment, then return step 5.3.
3. the accidental access method of TDD-CDMA system as claimed in claim 1, it is characterized in that, if access interference at random takes place, perhaps on the forward physical access channel, do not receive network side admission confirm information at described step 5.6 terminal equipment, when then terminal equipment carries out the uplink synchronous code repeating transmission, again select a uplink synchronous code at random from the uplink synchronous code that given access service grade can be used, the uplink synchronous subchannel is constant, returns step 5.4.
4. the accidental access method of TDD-CDMA system as claimed in claim 1, it is characterized in that, if access interference at random takes place, perhaps on the forward physical access channel, do not receive network side admission confirm information at described step 5.6 terminal equipment, when then terminal equipment carries out the uplink synchronous code repeating transmission, again select a uplink synchronous subchannel at random from the uplink synchronous subchannel that given access service grade can be used, uplink synchronous code is constant, returns step 5.4.
5. as the accidental access method of claim 1,2,3 or 4 described TDD-CDMA systems, it is characterized in that wherein, the uplink synchronous subchannel is arranged in uplink pilot time slot.
6. the accidental access method of TDD-CDMA system as claimed in claim 5 is characterized in that, wherein, uplink pilot time slot is configured to N uplink synchronous subchannel, and numbering is from 0 to N-1, and wherein the N value is 1 or 2 or 4 or 8.
7. the accidental access method of TDD-CDMA system as claimed in claim 6, it is characterized in that, i uplink synchronous subchannel of uplink pilot time slot is the uplink pilot time slot that subframe numbers satisfies following condition: SFN ' mod N=i, wherein SFN ' is for being used to count the subframe numbers of number of sub frames, when the frame of system frame number SFN=0 began, SFN ' was arranged to 0.
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| CN101296022B (en) * | 2007-04-24 | 2012-09-26 | 展讯通信（上海）有限公司 | Condition code distribution method of E-HICH channel |
| CN102027797A (en) | 2008-03-14 | 2011-04-20 | 诺基亚西门子通信公司 | Method, devices and system for local collision avoidance for random access in relay networks |
| US10887926B2 (en) | 2017-10-26 | 2021-01-05 | Mediatek Inc. | Configuration of non-orthogonal multiple access transmissions in a wireless communication system |
| CN112889229B (en) * | 2018-09-28 | 2023-01-13 | 上海诺基亚贝尔股份有限公司 | Spreading of signatures for multiple access techniques |
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| CN1299220A (en) * | 1999-12-08 | 2001-06-13 | 西门子公司 | Method for keeping synchronous transmission of signal in up-going links in radio communication system |
| WO2001097411A1 (en) * | 2000-06-12 | 2001-12-20 | Samsung Electronics Co., Ltd | Method of assigning an uplink random access channel in a cdma mobile communication system |
| CN1497882A (en) * | 2002-10-23 | 2004-05-19 | 华为技术有限公司 | Random insertion method fortime-division duplex system |
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Patent Citations (4)
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| US6094576A (en) * | 1996-05-27 | 2000-07-25 | Nokia Telecommunications Oy | Connection establishment method and radio system |
| CN1299220A (en) * | 1999-12-08 | 2001-06-13 | 西门子公司 | Method for keeping synchronous transmission of signal in up-going links in radio communication system |
| WO2001097411A1 (en) * | 2000-06-12 | 2001-12-20 | Samsung Electronics Co., Ltd | Method of assigning an uplink random access channel in a cdma mobile communication system |
| CN1497882A (en) * | 2002-10-23 | 2004-05-19 | 华为技术有限公司 | Random insertion method fortime-division duplex system |
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