CN103249136B - A kind of accidental access method, base station, subscriber equipment and system - Google Patents
A kind of accidental access method, base station, subscriber equipment and system Download PDFInfo
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- CN103249136B CN103249136B CN201210032911.3A CN201210032911A CN103249136B CN 103249136 B CN103249136 B CN 103249136B CN 201210032911 A CN201210032911 A CN 201210032911A CN 103249136 B CN103249136 B CN 103249136B
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Abstract
The invention provides a kind of accidental access method, base station, subscriber equipment and system.The method comprise the steps that base station receives each subscriber equipment by the uplink synchronization request sent；Base station determines the UpPCH receiving each subscriber equipmentPOS, and according to pre-defined rule, determine the filling position corresponding to numbering of the signature sequence of each subscriber equipment；The UpPCH of subscriber equipment, according to described filling position, is filled in base stationPOS, to generate FPACH information and sending, and, by numbering and the transmitting power command TPLC on RACH of correspondence of the signature sequence of system message broadcast relevant user equipment.The present invention can improve the Stochastic accessing disposal ability of TD SCDMA system, reduces the probability that random access failure occurs, improves user's experience to network.
Description
Technical field
The present invention relates to TD SDMA (TD-SCDMA, Time Division-Synchronous Code
Division Multiple Access) communication technical field, it is specifically related to TD-SCDMA system and accidental access method, base
Stand (NodeB)) and subscriber equipment (UE, User Equipment)
Background technology
TD-SCDMA standard is one of 3G (Third Generation) Moblie (3G) standard, and TD-SCDMA system supports up-downgoing speed not
Symmetrical business, combines CDMA (CDMA), time division multiple acess (TDMA) and the advantage of frequency division multiple access (FDMA) technology, simultaneously
TD-SCDMA system also uses intelligent antenna technology, baton handover technology between direct-cut operation and soft handover and permissible
Multiuser detection is used so that this 3G scheme has many particularly advantages in user equipment receiver.
UE initiates the initial procedure i.e. random access procedure of service call.When UE initiates business, need between UE and NodeB
Uplink synchronous process to be completed.From the connection establishment angle of physical layer, uplink synchronous process can be considered as in Stochastic accessing
A step.The flow process of uplink synchronous process is as it is shown in figure 1, it may comprise steps of:
Step 11, UE when carrying out multi-upstream access first at ascending pilot channel (UpPCH, Uplink Pilot
Channel) send uplink synchronization request, wherein carry uplink synchronous code (SYNC-UL sequence, sequence of i.e. signing that UE selects
Row), generally, each community corresponds to 8 kinds of SYNC-UL sequences, and UE randomly chooses an initiation from these 8 SYNC-UL sequences
Uplink synchronous；
Step 12, base station issues physical access channel (FPACH, Fast Physical to UE after receiving UpPCH
Access Channel) message, wherein comprise the information such as time timing adjustment and power adjustment；
Step 13, after UE receives FPACH message, according to information such as timing adjustment therein and power adjustment, adjusts physics
The transmitting power of RACH (PRACH, Physical Random Access Channel) and launch time,
Wireless resource control connection request (RRC CONNECTION REQUEST) request message is sent on PRACH channel；
Step 14, base station is the resources such as UE distribution channel, at forward access channel (FACH, Forward Access
Channel) upper transmission wireless heterogeneous networks connection establishment (RRC CONNECTION SETUP) message.
Hereafter, UE can be wireless in the upper transmission of dedicated transmission channel (DCH, Dedicated Transport Channel)
Resources control connection establishment completes (RRC CONNECTION SETUP COMPLETE) message to complete random access procedure.
Each base station in TD-SCDMA system provides 8 kinds of SYNC-UL sequences, selects to make when carrying out uplink synchronous for UE
With, the most same time can allow multiple UE to be concurrently accessed.Along with the increase of the number of users in network and user's liveness
Increase, be susceptible to the situation of the multiple UE within a short period of time of initiating random access procedure respectively, be limited in this case
The processing mode of existing TD-SCDMA system random access procedure, it is likely that cause UE random access failure, when extending its access
Between, have a strong impact on user's experience to network.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of accidental access method, base station, subscriber equipment and system, it is possible to
Improve the Stochastic accessing disposal ability of TD-SCDMA system, reduce the probability that random access failure occurs, improve user to net
The experience of network.
For solving above-mentioned technical problem, the present invention provides scheme as follows:
A kind of accidental access method of TD-SCDMA system, including:
Base station receives the uplink synchronization request that each subscriber equipment is sent by UpPCH, takes in described uplink synchronization request
Signature sequence with described subscriber equipment；
Base station determines the starting position UpPCH of the UpPCH receiving each subscriber equipmentPOS, and according to pre-defined rule, really
The filling position corresponding to numbering of the signature sequence of each subscriber equipment fixed, described filling position is described subscriber equipment
UpPCHPOSIt is filled in the position in FPACH message；
The UpPCH of subscriber equipment, according to described filling position, is filled in base stationPOS, to generate FPACH information and sending, with
And, the numbering of signature sequence and the transmitting power on RACH of correspondence by system message broadcast relevant user equipment are ordered
Make TPLC；Wherein, described relevant user equipment is to be filled with its UpPCH in described FPACH messagePOSSubscriber equipment.
Preferably, in said method, described generation FPACH message includes:
The signature sequence of this subscriber equipment is extracted from the synchronization request that each subscriber equipment sends；
From the signature sequence extracted, select the signature sequence only occurred once；
By the subscriber equipment corresponding to the described signature sequence only occurred once, as relevant user equipment, Jin Ergen
According to described filling position, fill the UpPCH of described relevant user equipmentPOS, build and obtain described FPACH message.
Preferably, in said method, described system message is system information block SIB7.
Preferably, in said method, a length of 88 bits of described FPACH message, described UpPCHPOSA length of 11 ratio
Spy, described FPACH message is only filled with the UpPCH of subscriber equipmentPOS, and it is filled with the UpPCH less than 8 subscriber equipmeniesPOS。
Present invention also offers a kind of base station, including:
Receive unit, for receiving the synchronization request that each subscriber equipment is sent by UpPCH, described synchronization request is taken
Signature sequence with described subscriber equipment；
Determine unit, for determining the starting position UpPCH of the UpPCH receiving each subscriber equipmentPOS, and according in advance
Set pattern then, determines the filling position corresponding to numbering of the signature sequence of each subscriber equipment, and described filling position is described use
The UpPCH of family equipmentPOSIt is filled in the position in FPACH message；
Transmitting element, for according to described filling position, filling the UpPCH of subscriber equipmentPOS, to generate FPACH message also
Send, and, by numbering and the sending out on RACH of correspondence of the signature sequence of system message broadcast relevant user equipment
Penetrate power command TPLC；Wherein, described relevant user equipment is to be filled with its UpPCH in described FPACH messagePOSUser set
Standby.
Preferably, in above-mentioned base station, described transmitting element includes:
FPACH message generation unit, for extracting this subscriber equipment from the synchronization request that each subscriber equipment sends
Signature sequence；From the signature sequence extracted, select the signature sequence only occurred once；Only occurred described once
The subscriber equipment corresponding to signature sequence, as relevant user equipment, and then according to described filling position, fill described relevant
The UpPCH of subscriber equipmentPOS, build and obtain described FPACH message.
Preferably, in above-mentioned base station, described system message is system information block SIB7.
Preferably, in above-mentioned base station, a length of 88 bits of described FPACH message, described UpPCHPOSA length of 11 ratio
Spy, described FPACH message is only filled with the UpPCH of subscriber equipmentPOS, and it is filled with the UpPCH less than 8 subscriber equipmeniesPOS。
Present invention also offers the accidental access method of another kind of TD-SCDMA system, including:
Subscriber equipment sends uplink synchronization request by UpPCH to base station, carries described in described uplink synchronization request
The signature sequence of subscriber equipment；
Described subscriber equipment receives system message and the FPACH message that described base station sends, wherein, described system message
In carry the transmitting power command TPLC on the numbering of signature sequence of described subscriber equipment and the RACH of correspondence, described
FPACH message carries the starting position UpPCH receiving UpPCH of described subscriber equipmentPOS, and described UpPCHPOSIt it is institute
State base station according to pre-defined rule, determine the filling position corresponding to numbering of the signature sequence of described subscriber equipment, and then according to
Described filling position is filled in FPACH message；
TPLC corresponding to the numbering of the signature sequence that described subscriber equipment extracts self from described system message, and
The UpPCH of self is extracted at filling position corresponding from described FPACH messagePOS；
Described subscriber equipment is according to TPLC and UpPCH extractedPOS, initiate Stochastic accessing.
Preferably, in said method,
TPLC and UpPCH that described basis is extractedPOS, initiate Stochastic accessing and include:
The transmitting power of PRACH is set according to the TPLC extracted, and according to the UpPCH extractedPOSCalculate PRACH
Launch time；
Radio Resource connection request message is sent on prach to initiate institute with described transmitting power in described launch time
State Stochastic accessing.
Preferably, in said method, described system message is system information block SIB7.
Present invention also offers a kind of subscriber equipment, including:
Transmitting element, for sending synchronization request by UpPCH to base station, carries described user in described synchronization request
The signature sequence of equipment；
Receiving unit, for receiving system message and the FPACH message that described base station sends, wherein, described system disappears
Breath carries the transmitting power command TPLC on the numbering of the signature sequence of described subscriber equipment and the RACH of correspondence, described
FPACH message carries the starting position UpPCH receiving UpPCH of described subscriber equipmentPOS, and described UpPCHPOSIt it is institute
State base station according to pre-defined rule, determine the filling position corresponding to numbering of the signature sequence of described subscriber equipment, and then according to
Described filling position is filled in FPACH message；
Obtain unit, for TPLC corresponding to the numbering of the signature sequence that extracts self from described system message, with
And from described FPACH message, at the filling position of correspondence, extract the UpPCH of selfPOS；
Access unit, for according to TPLC and UpPCH extractedPOS, initiate Stochastic accessing.
Preferably, in above-mentioned subscriber equipment, described access unit is further used for arranging according to the TPLC extracted
The transmitting power of PRACH, and according to the UpPCH extractedPOSCalculate the launch time of PRACH；And in described launch time
Radio Resource connection request message is sent on prach to initiate described Stochastic accessing with described transmitting power.
Preferably, in above-mentioned subscriber equipment, described system message is system information block SIB7.
Present invention also offers a kind of TD-SCDMA system, this system includes above-described base station, also including above
Described subscriber equipment.
From the above it can be seen that the present invention provide accidental access method, base station, subscriber equipment and system, it is possible to
In a subframe, most 8 UE simultaneously initiating Stochastic accessing are responded, be only capable of most 4 relative to prior art
Initiating the processing mode that the UE of Stochastic accessing carries out responding, the present invention can significantly improve many UE and initiate Stochastic accessing simultaneously simultaneously
Disposal ability, thus reduce the possibility of access failure, reduce turn-on time, improve the experience of user.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of uplink synchronous process of prior art；
Fig. 2 is a kind of schematic flow sheet of accidental access method described in the embodiment of the present invention；
Fig. 3 is that NodeB receives the schematic diagram of SYNC-UL sequence in the time of regulation；
Fig. 4 is the schematic diagram that NodeB receives SYNC-UL sequence after the time of regulation；
Fig. 5 is the schematic diagram that NodeB received SYNC-UL sequence before the time of regulation；
Fig. 6 is the another kind of schematic flow sheet of accidental access method described in the embodiment of the present invention；
The structural representation of a kind of base station that Fig. 7 provides for the embodiment of the present invention；
The structural representation of a kind of subscriber equipment that Fig. 8 provides for the embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, the most right
The present invention is described in detail.
The random access procedure of existing TD-SCDMA system is conducted in-depth analysis by inventor, it was found that its access capability
Not enough main cause.Hereinafter first random access procedure and deficiency thereof to existing TD-SCDMA system is analyzed.
The structure of the FPACH message of prior art is as shown in table 1 below,
Table 1
In upper table:
" signature reference number " represents the SYNC-UL sequence of UE transmission numbering in the code character of community；
Subframe numbers when " relative subframe numbers " expression UE receives FPACH message sends subframe during SYNC-UL sequence with it
Number difference；
The starting position of UpPCH of subscriber equipment " NodeB receive ", is abbreviated as UpPCHPOS, represent that NodeB exists
(being linked into network when, UE uses this information to adjust certainly in the SYNC-UL position detected in " SYNC-UL detects window "
Oneself timing information)；
" the transmitting power command on RACH ", is abbreviated as TPLC, represents the PRACH expectation received power of NodeB, UE evidence
This recalculates transmit power；Here, RACH refers to RACH (Random Access Channel).
Owing to different UE may initiate synchronizing process in same subframe, sending different SYNC-UL sequences, therefore UE is permissible
The most identical with the numbering of the SYNC-UL sequence that self sends by judging the signature reference number in FPACH message, judge certainly
Whether body may be target UE of this FPACH message；
Simultaneously as different UE may send identical SYNC-UL sequence, respectively therefore, at signature in different subframes
When reference number is identical with the numbering of the SYNC-UL sequence that self sends, UE can be further by sending SYNC-UL according to self
Difference between sequence and the subframe numbers receiving FPACH message, if with the relative subframe numbers phase in this FPACH message
Join, it is judged that self be whether target UE of this FPACH message.
It can be seen that existing FPACH message makes network side be only capable of in a subframe a UE feedback synchronization and rings
Should.
TD-SCDMA system allows multiple UE of same time to be concurrently accessed.Refer to shown in table 2 below, it is assumed that existing
In TD-SCDMA system, certain community there are simultaneously two UE send signature sequence SYNC-UL sequence on UpPCH in each subframe
Row, wherein, in the 0th～3 system subframe, one has UE1～UE8 totally 8 UE initiation uplink synchronous (such as the 2nd row in table 2
Shown in).7 UE can be responded in 7 subframes (i.e. the 1st～7 subframe, altogether 35ms) after the 0th subframe by NodeB
(sending FPACH message), as shown in the 3rd row in table 2, but UE8 will be unable to be responded in this synchronizing process, will cause
The failure of UE8 uplink synchronous, its reason is: after UE have sent signature sequence, will intercept relevant within ensuing WT subframe
FPACH, it is thus achieved that the confirmation of network.According to 3GPP agreement relevant regulations, one is sent in WT subframe and signs by network
Name sequence confirms, the maximum of WT is 4 subframes (sub frames), i.e. 20ms.Due to can only in each subframe of network
Responding a UE, in 4 subframes after the signature sequence of UE8 receives, (i.e. the 4th～7 subframe) network all cannot
Respond thereto, thus result in UE8 synchronization failure.Synchronize successful UE and can send wireless heterogeneous networks on prach
(RRC) connection request message, initiates Stochastic accessing, as shown in the 4th～7 row in table 2.UE8 does not the most receive
FPACH responds, and will again send SYNC-UL sequence, therefore be delayed its turn-on time, cause bad user's perception.
Table 2
Refer to again shown in table 3 below, it is assumed that in existing TD-SCDMA system, at same subframe (table 3 in certain community
In be the 0th subframe) in have 8 UE to send signature sequence SYNC-UL sequence on UpPCH (such as the 2nd row institute in table 3 simultaneously
Show).In 4 subframes thereafter, (i.e. the 1st～4 subframe) network is only capable of responding 4 UE, thus results in remaining 4
UE synchronization failure.Synchronize successful UE can send on prach RRC ask message, initiate Stochastic accessing, as in table 3 the 4th～
Shown in 7 row.4 UE of synchronization failure the most do not receive FPACH response, will again send SYNC-UL sequence,
Thus result in and extend its turn-on time, cause bad user's perception.
Table 3
It can be seen that in same subframe or continuous multiple subframe, if the UE quantity initiating synchronizing process in community is too much,
Then can cause part UE synchronization failure, extend its turn-on time, affect the experience of user.
The synchronizing process of prior art, network side is only capable of responding a UE in each subframe, and network pair
The signature sequence received before WT subframe will no longer respond, thus cause at the Stochastic accessing of existing TD-SCDMA system
The problem of reason scarce capacity.
For solving problem above, the flow process of existing Stochastic accessing is improved by the embodiment of the present invention, the most right
FPACH message is redesigned so that it is can respond multiple UE in a subframe, thus improve TD-SCDMA
The Stochastic accessing disposal ability of system, below will be described in more detail.
The spreading factor of FPACH is 16, and a time slot can transmit 44 symbols (totally 88 bits).Can from table 1
Going out, prior art has used altogether 3+2+11+7+9=32 bit, the most all with full 88 bits.The embodiment of the present invention is led to
Cross and design a kind of new FPACH structure, at most 8 UE being concurrently accessed can be responded, thus improve access and process
Ability, decreases UE access delay.
The present embodiment, by redefining the content of FPACH message, for the field of each UE 11 bit lengths of distribution, is used
In carrying the starting position of UpPCH of subscriber equipment " NodeB the receive " (UpPCH shown in table 1POS), such FPACH disappears
Breath at most can carry the UpPCH of 8 UEPOS, such that it is able to the most multipair 8 UE carry out sync response, significantly in a subframe
Improve the access disposal ability of network.
The present embodiment can carry in one FPACH message the UpPCH of more than 2 UEPOS, it is therefore necessary to each
The UpPCH of UEPOSFilling position in FPACH message pre-defines.To this end, can be equal at network side and UE side in advance
The rule that configuration is corresponding so that network side is filled with according to certain fill rule, UE according to corresponding detected rule from FPACH
Respective UpPCH is detected and extracted in corresponding position in messagePOS。
The embodiment of the present invention can pre-set the corresponding relation between SYNC-UL sequence numbering and filling position, different
SYNC-UL sequence numbering corresponding to different filling positions, i.e. the SYNC-UL sequence of numbering 0～7 each correspondence FPACH respectively
Filling positions different in message.Such as, at the 0th～10 bit of FPACH message, the SYNC-UL using numbered 0 is filled
The UpPCH of the UE of sequencePOS；At the 11st～21 bit, fill the UpPCH of the UE of the SYNC-UL sequence using numbered 1POS；
By that analogy, at the 77th～87 bit, the UpPCH of the UE of the SYNC-UL sequence using numbered 7 is filledPOS。
Certainly, the present embodiment can also use contrary fill order, such as, at the 0th～10 ratio of FPACH message
Spy, fills the UpPCH of the UE of the SYNC-UL sequence using numbered 7POS；At the 11st～21 bit, fill and use numbered 6
The UpPCH of UE of SYNC-UL sequencePOS；By that analogy, at the 77th～87 bit, the SYNC-UL using numbered 0 is filled
The UpPCH of the UE of sequencePOS。
Being similar to, the embodiment of the present invention can also use other filling position, and therefore the present invention does not limit concrete
Filling position, it is only necessary to subscriber equipment can be according to the filling position of network side, and the corresponding position from FPACH message carries
Obtain its UpPCHPOS?.
For making UE can detect its corresponding UpPCH in the corresponding position from FPACH messagePOS, the present embodiment can
To configure detection mode corresponding with network side fill rule in advance at UE, so that UE is in its SYNC-UL sequence numbering correspondence
Filling position at detect UpPCHPOS.It is of course also possible to by the way of broadcast, network side corresponding detection mode is led to
Know to UE.
In the present embodiment, network side also needs to send this UE transmitting power command (TPLC) on RACH to UE.This reality
Execute example and carry out broadcast transmission especially by system message, this system message carries relevant UE signature sequence numbering with
And the transmitting power command TPLC on RACH of correspondence, described relevant user equipment is to be filled with it in described FPACH message
UpPCHPOSSubscriber equipment.So, UE is according to the numbering whether carrying its signature sequence in system message, it is possible to determine
FPACH message fills whether be filled with its UpPCHPOS, and then the volume of the signature sequence of self can be extracted respectively from system message
Its UpPCH is detected at TPLC corresponding to number, and filling position corresponding from described FPACH messagePOS, and then according to carrying
The TPLC got arranges the transmitting power of PRACH, and according to the UpPCH extractedPOSCalculate the launch time of PRACH, then
Radio Resource connection request message is sent to initiate Stochastic accessing with described transmitting power in described launch time.
UE, when initiating uplink synchronous, randomly chooses a kind of as its signature sequence, at random from 8 kinds of SYNC-UL sequences
Selection algorithm would generally ensure that the selected probability of each signature sequence is equal.Therefore use different SYNC-at 8 UE simultaneously
When UL sequence initiates uplink synchronous, these UE can be responded in a subframe by the embodiment of the present invention, relative to existing
Being only capable of the processing mode responding a UE in one subframe of technology, the embodiment of the present invention can significantly improve UE and connect at random
The disposal ability entered, thus reduce the possibility of access failure, reduce turn-on time, improve the experience of user.
It is described separately being embodied as of the embodiment of the present invention individually below from NodeB and subscriber equipment (UE) side.
Refer to Fig. 2, accidental access method described in the embodiment of the present invention, during the base station being applied in TD-SCDMA system,
May comprise steps of:
Step 21, base station receives the uplink synchronization request that each UE is sent by UpPCH, takes in described uplink synchronization request
Signature sequence with described UE.
Step 22, base station determines the UpPCH of each UEPOS, and according to pre-defined rule, determine the signature sequence of each UE
Filling position corresponding to numbering, described filling position is the UpPCH of described UEPOSIt is filled in the position in FPACH message.
Here, UpPCHPOSAdjustment time carried out for indicating UE to need when transmitting follow-up to NodeB.This
In embodiment, NodeB can calculate UpPCH according to mode same as the prior artPOSThe concrete numerical value of this parameter:
UpPCHPOS=UpPTSRxpath-UpPTSTS
Wherein:
UpPTSRxpath: during uplink synchronous, NodeB receives the time of SYNC-UL.
UpPTSTS: in NodeB timing, downlink pilot frequency channel (DwPCH) terminates front 2 symbols (32 chip chips).
Calculated UpPCHPOSFor when UE access network, it is used for adjusting the time.
UpPCHPOSThe scope of value is 0-2047, and unit is 1/8chip, and a kind of coding rule is as follows:
It is 0chip that bit sequence (0 ... 00 0) instruction receives the starting position of UpPCH；
It is 1*1/8 chip that bit sequence (0 ... 00 1) instruction receives the starting position of UpPCH；
It is 2047*1/8 chip that bit sequence (11 ... 11 1) instruction receives the starting position of UpPCH.
Refer to Fig. 3～5, wherein, a kind of situation shown in Fig. 3 is: work as UpPCHPOSDuring=8*16*8=1024, represent
NodeB receives, in the time of regulation, the SYNC-UL sequence that UE sends just.
A kind of situation shown in Fig. 4 is: work as UpPCHPOSDuring ＞ 8*16*8=1024, represent NodeB regulation time it
After receive UE send SYNC-UL sequence.
A kind of situation shown in Fig. 5 is: work as UpPCHPOSDuring ＜ 8*16*8=1024, represent NodeB regulation time it
Before receive UE send SYNC-UL sequence.
Step 23, the UpPCH of UE, according to described filling position, is filled in base stationPOS, to generate FPACH information and sending, with
And, by numbering and the TPLC of correspondence of the signature sequence of the relevant UE of system message broadcast, so that described relevant UE is from institute
State TPLC corresponding to the numbering of the signature sequence extracting self in system message, and correspondence from described FPACH message
Respective UpPCH is detected at filling positionPOS, and then according to respective TPLC and UpPCHPOS, initiate Stochastic accessing；
Wherein, described relevant UE is to be filled with its UpPCH in described FPACH messagePOSUE.
The situation of uplink synchronous is the most all initiated, the most still in view of there is multiple UE
There may be plural UE and use same signature sequence, for avoiding conflict, in the present embodiment, network side is when responding,
The UE using same signature sequence can not be responded.Now, in above-mentioned steps 23, described base station can be according to lower section
The formula described FPACH message of generation:
First, from the synchronization request that each UE sends, extract the signature sequence of this UE；
Secondly, from the signature sequence extracted, selecting the signature sequence only occurred once, so those occurred
The signature sequence of more than twice will be filtered；
Then, by the UE corresponding to the described signature sequence only occurred once, as relevant UE, and then fill out according to described
Fill position, fill the UpPCH of described relevant UEPOS, build and obtain described FPACH message.
FPACH message multipotency in view of the present embodiment carries 8 UpPCHPOS, therefore when selecting described relevant UE,
The quantity of described relevant UE can be controlled less than or equal to 8.
In the present embodiment, system message broadcast transmission is utilized to be correlated with the numbering of signature sequence of UE and the TPLC of correspondence.
Owing to system message is destined to all UE inside a community, while therefore transmitting TPLC in system message, also need
Carry the numbering of the signature sequence of the UE corresponding with this TPLC, in order to allow this UE know in this system message and carry its TPLC
Information.System message can be carried signature sequence numbering and the TPLC of correspondence of more than one UE, for example, it is possible to take
With UE1 signature sequence number and correspondence TPLC1, UE2 signature sequence numbering and the TPLC2...... of correspondence so that
After corresponding UE detects oneself signature sequence numbering from system message, extract further corresponding with this numbering
TPLC, thus obtain the TPLC information of self.System message described in the present embodiment preferably can use system information block 7
(SIB7).SIB7 is the system message under idle condition, the cycle (Millisecond) arranged by system, periodically sends to UE.
After above-mentioned steps 23, UE is according to TPLC and UpPCH extractedPOS, initiate Stochastic accessing, the specifically side of process
Formula can be same as the prior art, i.e. arrange the transmitting power of PRACH according to the TPLC that extracts, and according to extracting
UpPCHPOSCalculate T launch time of PRACHTX-PRACH, then UE described launch time with described transmitting power on prach
Send Radio Resource connection request message to initiate Stochastic accessing；Then, base station is receiving the Radio Resource connection that UE sends
After request message, for resources such as UE distribution channels, FACH sends wireless heterogeneous networks connection establishment message.Hereafter, UE can
To send wireless heterogeneous networks connection setup complete message on DCH to complete random access procedure.
It can be seen that compared to prior art, embodiment of the present invention base station need not can be carried in described FPACH message again
Signature reference number and relative subframe numbers, described FPACH message can be only filled with the UpPCH of UEPOS.Do not changing standard regulation
In the case of the length (88 bit) of FPACH message, the present embodiment at most can fill 88/11=8 UE's in FPACH message
UpPCHPOS, i.e. the uplink synchronous of 8 UE at most can be responded in a subframe simultaneously, thus be greatly improved by base station
The Stochastic accessing disposal ability of network.
The most again the uplink synchronous of UE side in the embodiment of the present invention is processed and illustrate.
Refer to Fig. 6, accidental access method described in the embodiment of the present invention, during the UE being applied in TD-SCDMA system, can
To comprise the following steps:
Step 61, UE sends uplink synchronization request by UpPCH to base station, carries described in described uplink synchronization request
The signature sequence of UE.
Here, UE sends the mode of uplink synchronization request and can be subdivided into following steps:
(1) retransmission counter of signature sequence (distributing to 8 SYNC-UL sequences of UpPTS for Stochastic accessing) is set.
(2) signature sequence is set and launches power for signature initial power.
(3) randomly choose under given access service grade (ASC, Access Service Classe) one available
UpPCHs subchannel (Sub-channel) and an available signature sequence (SYNC-UL).Random function should ensure that every height is believed
Road and the selected probability of signature sequence are equal.
(4) with selected UpPCH Sub-channel, launch power with signature and send a signature sequence.When require
When signature transmitting power constantly increases and exceedes maximum permissible value, arranging signature launching power is maximum permissible value.
Step 62, described UE receives system message and the FPACH message that described base station sends, and wherein, described system disappears
Breath carries the transmitting power command TPLC, described FPACH on the numbering of the signature sequence of described UE and the RACH of correspondence
Message carries the starting position UpPCH receiving UpPCH of described UEPOS, and described UpPCHPOSDescribed base station according to
Pre-defined rule, determines the filling position corresponding to numbering of the signature sequence of described UE, and then fills according to described filling position
In FPACH message.
Here, UE, can be according to processing mode same as the prior art after have sent signature sequence, with the most double
Hold existing handling process, reduce the change to existing network: within ensuing WT subframe, intercept relevant FPACH,
Obtain the confirmation of network.Concrete, UE reads relevant to the UpPCH sent in the subframe meeting following relation
FPACHi:
(SFN′ mod Li)=nRACHi；nRACHi=0 ..., NRACHi-1
Wherein FPACHiFor channel number be the FPACH of i, Li be the length of RACH transmission block, nRACHiFor i-th FPACH
The channel number of some corresponding PRACH, NRACHiRepresent the PRACH sum that i-th FPACH is corresponding.
For example, it is assumed that existing network configures Li=2 at present, only it is configured with a PRACH, NRACHi=1, then nRACHi=0.Root
According to formula (SFN ' mod Li)=nRACHiI.e. (SFN ' mod 2)=0, say, that UE only 0,2, the even number such as 4...
SFN ' intercepts FPACH.
Here, the channel number of FPACH to be intercepted for UE is calculated according to the following equation:
FPACHi=N mod M
Wherein, N represents that signature sequence is numbered, and M represents the maximum FPACH quantity of cell configuration.
Such as, if two FPACH of network configuration, M=2, FPACH channel number is respectively FPACH0、FPACH1, root
According to formula F PACHi=N mod M, it is known that:
Send the numbered UE of 0,2,4,6 of signature sequence and should intercept FPACH0。
Send the numbered UE of 1,3,5,7 of signature sequence and should intercept FPACH1。
At present, existing network the most only configures 1 FPACH channel, so sending signature sequence number is 0,1,2,3,4,5,6,7
UE the most only intercepts FPACH0。
(6) if UE is not detected by effective response within the scheduled time, signature retransmission counter subtracts 1: if enumerator is worked as
Front value still greater than 0, then returns to (3rd) above-mentioned step；Otherwise, connect the most at random to the report of medium education (MAC) sublayer
Enter failure.
(7) if UE detects effective response within the scheduled time, i.e. the signature sequence of this UE detected from system message
Column number, now enters step 63.
Step 63, TPLC corresponding to the numbering of the signature sequence that described UE extracts self from described system message, with
And from described FPACH message, at the filling position of correspondence, extract the UpPCH of selfPOS。
Here, TPLC corresponding to the numbering of the signature sequence that UE extracts self from described system message.Due to system
Message carries the numbering of the signature sequence of this UE, then carry the UpPCH of this UE in explanation FPACH messagePOS, therefore UE can
With the numbering according to self signature sequence, determine the filling position that this numbering is corresponding, then corresponding from FPACH message filling
Position extracts the UpPCH of selfPOS, thus follow-up UE can arrange time and power electricity according to these instructions received
Level values.
Step 64, described UE is according to TPLC and UpPCH extractedPOS, initiate Stochastic accessing.
Here, UE arranges the transmitting power of PRACH according to the TPLC extracted, and according to the UpPCH extractedPOSMeter
Calculate T launch time of PRACHTX-PRACH, wherein, the calculating of launch time can be same as the prior art, with preferably compatible existing
Some handling processes, the minimizing change to existing network:
TTX-PRACH=TRX-PRACH-(UpPCHADV+UpPCHPOS-8*16TC)
Wherein, TTX-PRACHUnit is 1/8 chip time.
TTX-PRACH: in UE timing, UE starts to launch the PRACH time；
TRX-PRACH: in UE timing, if using PRACH place channel as down channel, the starting of channel receives the time；
UpPCHADVIt it is the UpPCH timing advance time；
TCRepresent the time span of a chip；
(UpPCHADV+UpPCHPOS-8*16TC) represent PRACH the timing advance time, be the UpPCH timing advance time
UpPCHADVAdd (UpPCHPOS-8*16TC)。
Then, UE sends Radio Resource connection request message in described launch time on prach with described transmitting power
To initiate Stochastic accessing.Hereafter, the random access request of base station in response UE, FACH sends wireless heterogeneous networks connection establishment
Message.Hereafter, UE can send wireless heterogeneous networks connection setup complete message to complete random access procedure on DCH.
Further illustrate the embodiment of the present invention advantage relative to prior art below by way of table 4, apply the present invention
After method described in embodiment, it is assumed that in TD-SCDMA system, same subframe (table 4 being the 0th subframe) in certain community
Middle have 8 UE to send signature sequence SYNC-UL sequence (as shown in the 2nd row in table 4) on UpPCH simultaneously.Network side is permissible
Completing the response to these 8 UE in (i.e. the 1st～2 subframe) in 2 subframes thereafter, then these 8 UE can be
Initiate Stochastic accessing on PRACH0～3 respectively, thus process while realizing 8 UE Stochastic accessing, substantially increase existing TD-
The Stochastic accessing disposal ability of SCDMA system.
Table 4
Corresponding with method described in above example, the embodiment of the present invention still further provides the dress implementing above method
Put and system.
Refer to Fig. 7, a kind of base station that the embodiment of the present invention provides, specifically may include that
Receive unit, for receiving the uplink synchronization request that each UE is sent by UpPCH, in described uplink synchronization request
Carry the signature sequence of described UE；
Determine unit, for determining the starting position UpPCH of the UpPCH receiving each UEPOS, and according to pre-defined rule,
Determining the filling position corresponding to numbering of the signature sequence of each UE, described filling position is the UpPCH of described UEPOSFill
Position in FPACH message；
Transmitting element, for according to described filling position, filling the UpPCH of UEPOS, to generate FPACH information and sending,
And, by numbering and the transmitting power command on RACH of correspondence of the signature sequence of the relevant UE of system message broadcast
TPLC, so that TPLC corresponding to the numbering of the described relevant UE signature sequence that extracts self from described system message, with
And detect respective UpPCH at the filling position of correspondence from described FPACH messagePOS, and then according to respective TPLC and
UpPCHPOS, initiate Stochastic accessing；
Wherein, described relevant UE is to be filled with its UpPCH in described FPACH messagePOSUE.
It is preferred here that described system message can be SIB7；A length of 88 bits of described FPACH message, described
UpPCHPOSA length of 11 bits, described FPACH message is only filled with the UpPCH of subscriber equipmentPOS, and be filled with less than 8
The UpPCH of subscriber equipmentPOS。
As a kind of preferred implementation, described transmitting element may include that
FPACH message generation unit, for extracting the signature sequence of this UE from the synchronization request that each UE sends；From carrying
In the signature sequence got, select the signature sequence only occurred once；By the described signature sequence institute only occurred once
Corresponding UE, as relevant UE, and then according to described filling position, fills the UpPCH of described relevant UEPOS, build described in obtaining
FPACH message.
Refer to Fig. 8, a kind of UE that the embodiment of the present invention provides, specifically may include that
Transmitting element, for sending uplink synchronization request by UpPCH to base station, carries in described uplink synchronization request
The signature sequence of described UE；
Receiving unit, for receiving system message and the FPACH message that described base station sends, wherein, described system disappears
Breath carries the numbering of the signature sequence of described UE and the transmitting power command (TPLC) on RACH of correspondence, described
FPACH message carries the UpPCH of described UEPOS, and described UpPCHPOSBe described base station according to pre-defined rule, determine described
Filling position corresponding to the numbering of the signature sequence of UE, and then be filled in FPACH message according to described filling position；
Obtain unit, for TPLC corresponding to the numbering of the signature sequence that extracts self from described system message, with
And from described FPACH message, at the filling position of correspondence, extract the UpPCH of selfPOS；
Access unit, for according to TPLC and UpPCH extractedPOS, initiate Stochastic accessing.
Here, described access unit can be further used for arranging the transmitting power of PRACH according to the TPLC extracted, with
And according to the UpPCH extractedPOSCalculate the launch time of PRACH；And exist with described transmitting power in described launch time
PRACH upper transmission Radio Resource connection request message is to initiate described Stochastic accessing.Described system message is preferably SIB7.
The embodiment of the present invention additionally provides a kind of TD-SCDMA communication system, this system include above-described base station and
UE.Concrete,
Described base station, for receiving the uplink synchronization request that each UE is sent by UpPCH, in described uplink synchronization request
Carry the signature sequence of described UE；Determine the starting position UpPCH of the UpPCH receiving each UEPOS, and according to pre-set pattern
Then, determining the filling position corresponding to numbering of the signature sequence of each UE, described filling position is the UpPCH of described UEPOSFill out
Fill the position in FPACH message；According to described filling position, fill the UpPCH of UEPOS, to generate FPACH information and sending,
And, by numbering and the transmitting power command on RACH of correspondence of the signature sequence of the relevant UE of system message broadcast
(TPLC), wherein, described relevant UE is to be filled with its UpPCH in described FPACH messagePOSUE；
Described UE, is used for by UpPCH to the described uplink synchronization request of described base station transmission；Receive what described base station sent
System message and FPACH message；TPLC corresponding to the numbering of the signature sequence extracting self from described system message, with
And from described FPACH message, at the filling position of correspondence, extract the UpPCH of selfPOS；According to the TPLC extracted and
UpPCHPOS, initiate Stochastic accessing.
These many functional parts described in this description are all referred to as module, in order to specifically emphasize its realization side
The independence of formula.
In the embodiment of the present invention, module can realize with software, in order to is performed by various types of processors.Citing comes
Saying, the executable code module of a mark can include one or more physics or the logical block of computer instruction, citing
For, it can be built as object, process or function.While it is true, the executable code of identified module is without physically
Be located together, but in can including being stored in not coordination on different instructions, when combining in these command logics
Time, it constitutes module and realizes the regulation purpose of this module.
It practice, executable code module can be individual instructions or many bar instructions, and even can be distributed
On multiple different code segments, it is distributed in the middle of distinct program, and crosses over the distribution of multiple memory devices.Similarly, behaviour
Make data to be identified in module, and can realize according to any suitable form and be organized in any suitable class
In the data structure of type.Described operation data can be collected as individual data collection, or can be distributed on diverse location
(being included in different storage device), and electronic signal can be only used as at least in part be present on system or network.
When module can utilize software to realize, it is contemplated that the level of existing hardware technique, it is possible to implemented in software
Module, in the case of not considering cost, those skilled in the art can build correspondence hardware circuit to realize correspondence
Function, described hardware circuit includes ultra-large integrated (VLSI) circuit or gate array and the such as logic core of routine
The existing quasiconductor of sheet, transistor etc or other discrete element.Module can also use programmable hardware device, such as
Field programmable gate array, programmable logic array, programmable logic device etc. realize.
The above is only embodiments of the present invention, it is noted that come for those skilled in the art
Saying, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (11)
1. the accidental access method of a TD-SCDMA system, it is characterised in that including:
Base station receives the uplink synchronization request that each subscriber equipment is sent, described uplink synchronous by ascending pilot channel UpPCH
Request carries the signature sequence of described subscriber equipment；
Base station determines the starting position UpPCH of the UpPCH receiving each subscriber equipmentPOS, and according to pre-defined rule, determine each
Filling position corresponding to the numbering of the signature sequence of individual subscriber equipment, described filling position is described subscriber equipment
UpPCHPOSIt is filled in the position in physical access channel FPACH message；
The UpPCH of subscriber equipment, according to described filling position, is filled in base stationPOS, to generate FPACH information and sending, each described
FPACH message is carried the UpPCH of multiple subscriber equipmentPOS, and, by the signature of system message broadcast relevant user equipment
The numbering of sequence and the transmitting power command TPLC on RACH of correspondence, wherein, described relevant user equipment is described
FPACH message is filled with its UpPCHPOSSubscriber equipment；Described generation FPACH message includes:
The signature sequence of this subscriber equipment is extracted from the synchronization request that each subscriber equipment sends；
From the signature sequence extracted, select the signature sequence only occurred once；
By the subscriber equipment corresponding to the described signature sequence only occurred once, as relevant user equipment, and then according to institute
State filling position, fill the UpPCH of described relevant user equipmentPOS, build and obtain described FPACH message.
2. the method for claim 1, it is characterised in that a length of 88 bits of described FPACH message, described
UpPCHPOSA length of 11 bits, described FPACH message is only filled with the UpPCH of subscriber equipmentPOS, and be filled with less than 8
The UpPCH of subscriber equipmentPOS。
3. the method as described in any one of claim 1 to 2, it is characterised in that described system message is system information block SIB7.
4. a base station, it is characterised in that including:
Receive unit, for receiving the synchronization request that each subscriber equipment is sent, described synchronization by ascending pilot channel UpPCH
Request carries the signature sequence of described subscriber equipment；
Determine unit, for determining the starting position UpPCH of the UpPCH receiving each subscriber equipmentPOS, and according to pre-set pattern
Then, determining the filling position corresponding to numbering of the signature sequence of each subscriber equipment, described filling position is that described user sets
Standby UpPCHPOSIt is filled in the position in physical access channel FPACH message；
Transmitting element, for according to described filling position, filling the UpPCH of subscriber equipmentPOS, each described FPACH message is taken
UpPCH with multiple subscriber equipmeniesPOS, to generate FPACH information and sending, and, by system message, broadcast associated user sets
The numbering of standby signature sequence and the transmitting power command TPLC on RACH of correspondence, wherein, described relevant user equipment
It is to be filled with its UpPCH in described FPACH messagePOSSubscriber equipment；Described transmitting element includes:
FPACH message generation unit, for extracting the signature of this subscriber equipment from the synchronization request that each subscriber equipment sends
Sequence；From the signature sequence extracted, select the signature sequence only occurred once；By the described label only occurred once
Name subscriber equipment corresponding to sequence, as relevant user equipment, and then according to described filling position, fills described associated user
The UpPCH of equipmentPOS, build and obtain described FPACH message.
5. base station as claimed in claim 4, it is characterised in that a length of 88 bits of described FPACH message, described
UpPCHPOSA length of 11 bits, described FPACH message is only filled with the UpPCH of subscriber equipmentPOS, and be filled with less than 8
The UpPCH of subscriber equipmentPOS。
6. the base station as described in any one of claim 4 to 5, it is characterised in that described system message is system information block SIB7.
7. the accidental access method of a TD-SCDMA system, it is characterised in that including:
Subscriber equipment sends uplink synchronization request by ascending pilot channel UpPCH to base station, takes in described uplink synchronization request
Signature sequence with described subscriber equipment；
The system message of described subscriber equipment reception described base station transmission and physical access channel FPACH message, wherein,
Described system message carries on the numbering of the signature sequence of described subscriber equipment and the RACH RACH of correspondence
Transmitting power command TPLC, described FPACH message carries the starting position receiving UpPCH of described subscriber equipment
UpPCHPOS, and described UpPCHPOSBe described base station according to pre-defined rule, determine the numbering of the signature sequence of described subscriber equipment
Corresponding filling position, and then be filled in FPACH message according to described filling position, in each described FPACH message
Carry the UpPCH of multiple subscriber equipmentPOS；
TPLC corresponding to the numbering of the signature sequence that described subscriber equipment extracts self from described system message, and from institute
State the UpPCH extracting self at filling position corresponding in FPACH messagePOS；
Described subscriber equipment is according to TPLC and UpPCH extractedPOS, initiate Stochastic accessing；
TPLC and UpPCH that described basis is extractedPOS, initiate Stochastic accessing and include:
The transmitting power of Physical Random Access Channel PRACH is set according to the TPLC extracted, and according to extracting
UpPCHPOSCalculate the launch time of PRACH；
Described launch time with described transmitting power send on prach Radio Resource connection request message with initiate described with
Machine accesses.
8. method as claimed in claim 7, it is characterised in that described system message is system information block SIB7.
9. a subscriber equipment, it is characterised in that including:
Transmitting element, for sending synchronization request by ascending pilot channel UpPCH to base station, carries in described synchronization request
The signature sequence of described subscriber equipment；
Receive unit, for receiving system message and the physical access channel FPACH message that described base station sends, its
In, described system message carries the numbering of the signature sequence of described subscriber equipment and the RACH RACH of correspondence
On transmitting power command TPLC, described FPACH message carries the starting position receiving UpPCH of described subscriber equipment
UpPCHPOS, and described UpPCHPOSBe described base station according to pre-defined rule, determine the numbering of the signature sequence of described subscriber equipment
Corresponding filling position, and then be filled in FPACH message according to described filling position, in each described FPACH message
Carry the UpPCH of multiple subscriber equipmentPOS；
Obtain unit, for TPLC, Yi Jicong corresponding to the numbering of the signature sequence extracting self from described system message
The UpPCH of self is extracted at filling position corresponding in described FPACH messagePOS；
Access unit, for according to TPLC and UpPCH extractedPOS, initiate Stochastic accessing；
Described access unit is further used for arranging the transmitting merit of Physical Random Access Channel PRACH according to the TPLC extracted
Rate, and according to the UpPCH extractedPOSCalculate the launch time of PRACH；And in described launch time with described transmitting merit
Rate sends Radio Resource connection request message on prach to initiate described Stochastic accessing.
10. subscriber equipment as claimed in claim 9, it is characterised in that described system message is system information block SIB7.
11. 1 kinds of TD-SCDMA system, it is characterised in that this system includes the base station as described in any one of claim 5 to 8,
Also include the subscriber equipment as described in any one of claim 9 to 10.
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