CN103249136A - Random access method, base station, user equipment and system - Google Patents
Random access method, base station, user equipment and system Download PDFInfo
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- CN103249136A CN103249136A CN2012100329113A CN201210032911A CN103249136A CN 103249136 A CN103249136 A CN 103249136A CN 2012100329113 A CN2012100329113 A CN 2012100329113A CN 201210032911 A CN201210032911 A CN 201210032911A CN 103249136 A CN103249136 A CN 103249136A
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Abstract
The invention provides a random access method, a base station, user equipment and a system. The method comprises the following steps: the base station receives uplink synchronization requests sent by all user equipment; the base station confirms to receive the UpPCHPOS of each user equipment, and determines the corresponding filling positions of signature sequence numbers of all user equipment as per predefined rules; the base station fills the UpPCHPOS of each user equipment as per the filling positions to generate FPACH information and send the information; and the base station broadcasts signature sequence numbers of related user equipment and corresponding Transmit power commands (TPLC) on RACH through system information. According to the invention, the random access processing capacity of a TD-SCDMA system is improved, the possibility of random access failure is reduced, and the use experience of a user to the network is improved.
Description
Technical field
The present invention relates to TD SDMA (TD-SCDMA, Time Division-Synchronous Code Division Multiple Access) communication technical field, be specifically related to TD-SCDMA system and accidental access method thereof, base station (NodeB)) and subscriber equipment (UE, User Equipment)
Background technology
The TD-SCDMA standard is one of 3G (Third Generation) Moblie (3G) standard, the TD-SCDMA system supports the asymmetric business of up-downgoing speed, combine the advantage of code division multiple access (CDMA), time division multiple access (TDMA) and frequency division multiple access (FDMA) technology, simultaneously the TD-SCDMA system also adopt intelligent antenna technology, between the baton handover technology between direct-cut operation and the soft handover and can in the subscriber equipment receiver, use multiuser detection, make this 3G scheme have many special advantages.
The initial procedure that UE initiates service call is random access procedure.When UE initiates business, need to finish the uplink synchronous process between UE and the NodeB.Set up angle from the connection of physical layer, a step during the uplink synchronous process can be considered as inserting at random.The flow process of uplink synchronous process as shown in Figure 1, it can may further comprise the steps:
Step 11, UE when carrying out up access at first at ascending pilot channel (UpPCH, Uplink Pilot Channel) sends uplink synchronization request, wherein carry uplink synchronous code (the SYNC-UL sequence that UE selects, be signature sequence), usually, each residential quarter is corresponding to 8 kinds of SYNC-UL sequences, and UE selects one to initiate uplink synchronous from these 8 SYNC-UL sequences at random;
Step 12, base station issue physical access channel (FPACH, Fast Physical Access Channel) message to UE after receiving UpPCH, wherein comprise the time regularly to adjust and information such as power adjustment;
Step 13, after UE receives FPACH message, according to information such as wherein timing adjustment and power adjustment, adjust Physical Random Access Channel (PRACH, Physical Random Access Channel) transmitting power and launch time, sends wireless resource control connection request (RRC CONNECTION REQUEST) request message at the PRACH channel;
Step 14, base station are resources such as UE allocated channel, go up at forward access channel (FACH, Forward Access Channel) and send Radio Resource control connection foundation (RRC CONNECTION SETUP) message.
After this, UE can go up the foundation of transmission Radio Resource control connection at dedicated transmission channel (DCH, Dedicated Transport Channel) and finish (RRC CONNECTION SETUP COMPLETE) message to finish random access procedure.
Each base station in the TD-SCDMA system provides 8 kinds of SYNC-UL sequences, selects when carrying out uplink synchronous for UE to use, and therefore the same time can allow a plurality of UE to insert simultaneously.Along with the increase of the number of users in the network and the increase of user's liveness, a plurality of UE take place easily initiate the situation of random access procedure within a short period of time respectively, be subject to the existing TD-SCDMA system processing mode of access process at random in this case, cause UE access failure at random probably, prolong its turn-on time, had a strong impact on the experience of user to network.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of accidental access method, base station, subscriber equipment and system, can improve the access disposal ability at random of TD-SCDMA system, reduce the possibility of access failure generation at random, improve the user to the experience of network.
For solving the problems of the technologies described above, it is as follows to the invention provides scheme:
The accidental access method of a kind of TD-SCDMA system comprises:
The base station receives each subscriber equipment by the uplink synchronization request that UpPCH sends, and carries the signature sequence of described subscriber equipment in the described uplink synchronization request;
The starting position UpPCH of the UpPCH of each subscriber equipment is determined to receive in the base station
POS, and according to pre-defined rule, determine the corresponding filling position of numbering of the signature sequence of each subscriber equipment, described filling position is the UpPCH of described subscriber equipment
POSBe filled in the position in the FPACH message;
The UpPCH of subscriber equipment is filled according to described filling position in the base station
POS, with generation FPACH information and sending, and, numbering and the corresponding transmit power command TPLC on RACH of the signature sequence of relevant user equipment broadcasted by system message; Wherein, described relevant user equipment is to be filled with its UpPCH in described FPACH message
POSSubscriber equipment.
Preferably, in the said method, described generation FPACH message comprises:
From the synchronization request that each subscriber equipment sends, extract the signature sequence of this subscriber equipment;
From the signature sequence that extracts, select the signature sequence that only occurred once;
With the described corresponding subscriber equipment of signature sequence that only occurred once, as relevant user equipment, and then according to described filling position, fill the UpPCH of described relevant user equipment
POS, make up and obtain described FPACH message.
Preferably, in the said method, described system message is system information block SIB7.
Preferably, in the said method, the length of described FPACH message is 88 bits, described UpPCH
POSLength be 11 bits, described FPACH message is only filled the UpPCH of subscriber equipment
POS, and be filled with the UpPCH that is no more than 8 subscriber equipmenies
POS
The present invention also provides a kind of base station, comprising:
Receiving element is used for receiving each subscriber equipment by the synchronization request that UpPCH sends, and carries the signature sequence of described subscriber equipment in the described synchronization request;
Determining unit is used for determining receiving the starting position UpPCH of the UpPCH of each subscriber equipment
POS, and according to pre-defined rule, determine the corresponding filling position of numbering of the signature sequence of each subscriber equipment, described filling position is the UpPCH of described subscriber equipment
POSBe filled in the position in the FPACH message;
Transmitting element is used for according to described filling position, fills the UpPCH of subscriber equipment
POS, with generation FPACH information and sending, and, numbering and the corresponding transmit power command TPLC on RACH of the signature sequence of relevant user equipment broadcasted by system message; Wherein, described relevant user equipment is to be filled with its UpPCH in described FPACH message
POSSubscriber equipment.
Preferably, in the above-mentioned base station, described transmitting element comprises:
The FPACH message generation unit is used for from the signature sequence of this subscriber equipment of synchronization request extraction of each subscriber equipment transmission; From the signature sequence that extracts, select the signature sequence that only occurred once; With the described corresponding subscriber equipment of signature sequence that only occurred once, as relevant user equipment, and then according to described filling position, fill the UpPCH of described relevant user equipment
POS, make up and obtain described FPACH message.
Preferably, in the above-mentioned base station, described system message is system information block SIB7.
Preferably, in the above-mentioned base station, the length of described FPACH message is 88 bits, described UpPCH
POSLength be 11 bits, described FPACH message is only filled the UpPCH of subscriber equipment
POS, and be filled with the UpPCH that is no more than 8 subscriber equipmenies
POS
The present invention also provides the accidental access method of another kind of TD-SCDMA system, comprising:
Subscriber equipment sends uplink synchronization request by UpPCH to the base station, carries the signature sequence of described subscriber equipment in the described uplink synchronization request;
Described subscriber equipment receives system message and the FPACH message that described base station sends, wherein, carry the numbering of signature sequence of described subscriber equipment and the transmit power command TPLC on the corresponding RACH in the described system message, carry the starting position UpPCH that receives UpPCH of described subscriber equipment in the described FPACH message
POS, and described UpPCH
POSBe described base station according to pre-defined rule, determine the corresponding filling position of numbering of the signature sequence of described subscriber equipment, and then be filled in the FPACH message according to described filling position;
Described subscriber equipment extracts the corresponding TPLC of numbering of the signature sequence of self from described system message, and corresponding filling position extracts self UpPCH from described FPACH message
POS
Described subscriber equipment is according to the TPLC and the UpPCH that extract
POS, initiate to insert at random.
Preferably, in the said method,
The TPLC that described basis is extracted and UpPCH
POS, initiate to insert at random to comprise:
According to the TPLC that extracts the transmitting power of PRACH is set, and according to the UpPCH that extracts
POSCalculate the launch time of PRACH;
Send Radio Resource connection request message to initiate described at random access with described transmitting power at PRACH in described launch time.
Preferably, in the said method, described system message is system information block SIB7.
The present invention also provides a kind of subscriber equipment, comprising:
Transmitting element is used for sending synchronization request by UpPCH to the base station, carries the signature sequence of described subscriber equipment in the described synchronization request;
Receiving element, be used for receiving system message and the FPACH message that described base station sends, wherein, carry the numbering of signature sequence of described subscriber equipment and the transmit power command TPLC on the corresponding RACH in the described system message, carry the starting position UpPCH that receives UpPCH of described subscriber equipment in the described FPACH message
POS, and described UpPCH
POSBe described base station according to pre-defined rule, determine the corresponding filling position of numbering of the signature sequence of described subscriber equipment, and then be filled in the FPACH message according to described filling position;
Obtain the unit, be used for extracting from described system message the corresponding TPLC of numbering of the signature sequence of self, and the filling position of correspondence extracts self UpPCH from described FPACH message
POS
Access unit is used for according to the TPLC and the UpPCH that extract
POS, initiate to insert at random.
Preferably, in the above-mentioned subscriber equipment, described access unit is further used for arranging according to the TPLC that extracts the transmitting power of PRACH, and according to the UpPCH that extracts
POSCalculate the launch time of PRACH; And send Radio Resource connection request message with described transmitting power at PRACH in described launch time and describedly insert at random initiating.
Preferably, in the above-mentioned subscriber equipment, described system message is system information block SIB7.
The present invention also provides a kind of TD-SCDMA system, and this system comprises above-described base station, also comprises above-described subscriber equipment.
From the above as can be seen, accidental access method provided by the invention, base station, subscriber equipment and system, can in a subframe, respond maximum 8 UE that initiate simultaneously to insert at random, only can be to maximum 4 processing modes that the UE that initiates to insert at random simultaneously responds with respect to prior art, the present invention can significantly improve many UE and initiate the disposal ability that inserts at random simultaneously, thereby reduce the possibility of access failure, reduce turn-on time, improve user's experience.
Description of drawings
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 the described accidental access method of the embodiment of the invention;
Fig. 3 receives the schematic diagram of SYNC-UL sequence at official hour for NodeB;
Fig. 4 receives the schematic diagram of SYNC-UL sequence after official hour for NodeB;
Fig. 5 received the schematic diagram of SYNC-UL sequence before official hour for NodeB;
Fig. 6 is the another kind of schematic flow sheet of the described accidental access method of the embodiment of the invention;
The structural representation of a kind of base station that Fig. 7 provides for the embodiment of the invention;
The structural representation of a kind of subscriber equipment that Fig. 8 provides for the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
The inventor conducts in-depth analysis to the access process at random of existing TD-SCDMA system, has found the main cause of its access capability deficiency.Below at first access process at random and the deficiency thereof of existing TD-SCDMA system are analyzed.
The structure of the FPACH message of prior art is as shown in table 1 below,
Table 1
In the last table:
The numbering of SYNC-UL sequence in the code character of residential quarter that " signature reference number " expression UE sends;
Subframe numbers when the subframe numbers when " relatively subframe numbers " expression UE receives FPACH message and its transmission SYNC-UL sequence poor;
" NodeB receives the starting position of the UpPCH of subscriber equipment " noted by abridging and is UpPCH
POS, expression NodeB is detected SYNC-UL position (when being linked into network, UE uses this information to adjust the timing information of oneself) in " SYNC-UL detection window ";
" transmit power command on RACH " noted by abridging and is TPLC, the PRACH expectation received power of expression NodeB, and UE recomputates transmitted power accordingly; Here, RACH refers to Random Access Channel (Random Access Channel).
Because different UEs may be initiated synchronizing process in the same subframe, send different SYNC-UL sequences, therefore whether UE can identical with the numbering of the SYNC-UL sequence that self sends by judging the signature reference number in the FPACH message, judges whether self may be the object UE of this FPACH message;
Simultaneously, because different UEs may send identical SYNC-UL sequence respectively in different subframes, therefore, when the numbering of SYNC-UL sequence of signature reference number and self transmission is identical, UE can be further by sending the SYNC-UL sequence according to self and receiving difference between the subframe numbers of FPACH message, whether with this FPACH message in relative subframe numbers be complementary, judge whether self is the object UE of this FPACH message.
As can be seen, existing FPACH message makes that network side only can be to a UE feedback sync response in a subframe.
The TD-SCDMA system allows a plurality of UE of same time to insert simultaneously.Please refer to shown in the following table 2, suppose in existing TD-SCDMA system, there are two UE to send signature sequence SYNC-UL sequence at UpPCH in certain residential quarter in each subframe simultaneously, wherein, a total UE1～UE8 in the 0th～3 system's subframe totally 8 UE initiate uplink synchronous (shown in the row of the 2nd in the table 2).NodeB can be after the 0th subframe 7 subframes (i.e. the 1st～7 subframe, common 35ms) in 7 UE is responded (sending FPACH message), shown in the 3rd row in the table 2, yet UE8 can't be responded in this synchronizing process, to cause the failure of UE8 uplink synchronous, its former because: after UE has sent signature sequence, will within an ensuing WT subframe, intercept relevant FPACH, the acquisition network affirmation information.According to 3GPP agreement relevant regulations, network sends signature sequence to one and confirms that the maximum of WT is 4 subframes (sub frames), i.e. 20ms in WT subframe.Because can only respond a UE in each subframe of network, (i.e. the 4th～7 subframe) network all can't respond it, thereby cause the UE8 synchronization failure in 4 subframes after the signature sequence of UE8 receives.Synchronously successful UE can send Radio Resource control (RRC) connection request message at PRACH, initiates to insert at random, shown in the 4th～7 row in the table 2.UE8 does not receive the FPACH response at the appointed time, will send the SYNC-UL sequence again, has therefore postponed its turn-on time, causes bad user's perception.
Table 2
Please refer to again shown in the following table 3, suppose in existing TD-SCDMA system, having 8 UE to send signature sequence SYNC-UL sequence (shown in the row of the 2nd in the table 3) at UpPCH in the same subframe (being the 0th subframe in the table 3) simultaneously in certain residential quarter.(i.e. the 1st～4 subframe) network only can respond 4 UE in 4 subframes after this, thereby causes all the other 4 UE synchronization failures.Synchronously successful UE can send the RRC request message at PRACH, initiates to insert at random, shown in the 4th～7 row in the table 3.4 UE of synchronization failure do not receive the FPACH response at the appointed time, will send the SYNC-UL sequence again, thereby cause prolong its turn-on time, cause bad user's perception.
Table 3
As can be seen, in same subframe or continuous a plurality of subframe, if it is too much to initiate the UE quantity of synchronizing process in the residential quarter, then can cause part UE synchronization failure, prolong its turn-on time, influence user's experience.
The synchronizing process of prior art, network side only can respond a UE in each subframe, and the signature sequence that network receives before to WT subframe will no longer respond, thereby cause the problem that inserts the disposal ability deficiency at random of existing TD-SCDMA system.
For overcoming the above problems, the embodiment of the invention is improved the existing flow process that inserts at random, also FPACH message is redesigned simultaneously, can enough in a subframe, respond a plurality of UE, thereby improve the access disposal ability at random of TD-SCDMA system, below will be elaborated.
The spreading factor of FPACH is that 16, one time slots can transmit 44 symbols (totally 88 bits).As can be seen from Table 1, prior art has been used 3+2+11+7+9=32 bit altogether, not all with full 88 bits.The embodiment of the invention can respond 8 UE that insert simultaneously at most, thereby has improved the access disposal ability by a kind of new FPACH structure of design, has reduced the UE access delay.
Present embodiment is by redefining the content of FPACH message, and the field for each UE distributes 11 bit lengths is used for carrying " NodeB receives the starting position of the UpPCH of the subscriber equipment " (UpPCH shown in the table 1
POS), FPACH message can be carried the UpPCH of 8 UE at most like this
POSThereby, can in a subframe, carry out sync response to 8 UE at most, improved the access disposal ability of network greatly.
Can carry the UpPCH of 2 above UE in the present embodiment in FPACH message
POS, therefore be necessary the UpPCH to each UE
POSFilling position in FPACH message carries out pre-defined.For this reason, can all dispose corresponding rule at network side and UE side in advance, make network side fill according to certain fill rule, UE detects and extraction UpPCH separately according to the corresponding position of detection rule from FPACH message of correspondence
POS
The embodiment of the invention can set in advance the corresponding relation between SYNC-UL sequence numbering and the filling position, different SYNC-UL sequence numberings are corresponding to different filling positions, namely number 0～7 SYNC-UL sequence and distinguish different filling position in the corresponding FPACH message separately.For example, at the 0th～10 bit of FPACH message, fill to adopt the UpPCH of the UE that is numbered 0 SYNC-UL sequence
POSAt the 11st～21 bit, fill to adopt the UpPCH of the UE that is numbered 1 SYNC-UL sequence
POSBy that analogy, at the 77th～87 bit, fill to adopt the UpPCH of the UE that is numbered 7 SYNC-UL sequence
POS
Certainly, present embodiment also can adopt opposite fill order, for example, at the 0th～10 bit of FPACH message, fill to adopt the UpPCH of the UE that is numbered 7 SYNC-UL sequence
POSAt the 11st～21 bit, fill to adopt the UpPCH of the UE that is numbered 6 SYNC-UL sequence
POSBy that analogy, at the 77th～87 bit, fill to adopt the UpPCH of the UE that is numbered 0 SYNC-UL sequence
POS
Similarly, the embodiment of the invention can also adopt other filling position, so the present invention do not limit concrete filling position, only needs the subscriber equipment can both be according to the filling position of network side, and the corresponding position from FPACH message is extracted and obtained its UpPCH
POSGet final product.
For making UE to detect its corresponding UpPCH in the corresponding position from FPACH message
POS, present embodiment can be in advance in the configuration of UE place and the corresponding detection mode of network side fill rule, so that UE detects UpPCH at the filling position place of its SYNC-UL sequence numbering correspondence
POSCertainly, also can by network side corresponding detection mode be notified to UE by the mode of broadcasting.
In the present embodiment, network side also needs to send the transmit power command (TPLC) of this UE on RACH to UE.Present embodiment carries out broadcast transmission by system message especially, carry numbering and the corresponding transmit power command TPLC on RACH of the signature sequence of relevant UE in this system message, described relevant user equipment is to be filled with its UpPCH in described FPACH message
POSSubscriber equipment.Like this, UE can determine according to the numbering that whether carries its signature sequence in the system message whether the filling of FPACH message is filled with its UpPCH
POS, and then can be respectively extract the corresponding TPLC of numbering of the signature sequence of self from system message, and the filling position of correspondence detects its UpPCH from described FPACH message
POS, and then according to the TPLC that extracts the transmitting power of PRACH is set, and according to the UpPCH that extracts
POSCalculate the launch time of PRACH, send Radio Resource connection request message to initiate access at random in described launch time with described transmitting power then.
UE selects a kind ofly as its signature sequence from 8 kinds of SYNC-UL sequences when initiating uplink synchronous at random, and stochastic selection algorithm can guarantee that usually the selected probability of each signature sequence equates.Therefore when 8 UE adopt different SYNC-UL sequences to initiate uplink synchronous simultaneously, the embodiment of the invention can respond these UE in a subframe, with respect to the processing mode that only can respond a UE in subframe of prior art, the embodiment of the invention can significantly improve the disposal ability that UE inserts at random, thereby reduce the possibility of access failure, reduce turn-on time, improve user's experience.
The concrete enforcement of the embodiment of the invention below is described respectively from NodeB and subscriber equipment (UE) side respectively.
Please refer to Fig. 2, the described accidental access method of the embodiment of the invention when being applied to the base station in the TD-SCDMA system, can may further comprise the steps:
Here, UpPCH
POSBe used to indicate the adjustment that UE need carry out the time to NodeB transmission follow-up the time.NodeB can calculate UpPCH according to mode same as the prior art in the present embodiment
POSThe concrete numerical value of this parameter:
UpPCH
POS＝UpPTS
Rxpath-UpPTS
TS
Wherein:
UpPTS
Rxpath: NodeB receives the time of SYNC-UL in the uplink synchronous process.
UpPTS
TS: in the NodeB timing, downlink pilot frequency channel (DwPCH) finishes preceding 2 symbols (32 chip chips).
The UpPCH that calculates
POSBe used for when the UE access network, be used for the adjustment time.
UpPCH
POSThe scope of value is 0-2047, and unit is 1/8chip, and a kind of coding rule is as follows:
The starting position that bit sequence (0 ... 00 0) indication receives UpPCH is 0chip;
The starting position that bit sequence (0 ... 00 1) indication receives UpPCH is 1*1/8 chip;
......
The starting position that bit sequence (11 ... 11 1) indication receives UpPCH is 2047*1/8 chip.
Please refer to Fig. 3～5, wherein, a kind of situation shown in Figure 3 is: work as UpPCH
POSDuring=8*16*8=1024, expression NodeB receives the SYNC-UL sequence that UE sends at official hour just.
A kind of situation shown in Figure 4 is: work as UpPCH
POSDuring＞8*16*8=1024, expression NodeB receives the SYNC-UL sequence that UE sends after official hour.
A kind of situation shown in Figure 5 is: work as UpPCH
POSDuring＜8*16*8=1024, expression NodeB received the SYNC-UL sequence that UE sends before official hour.
Wherein, described relevant UE is filled with its UpPCH in described FPACH message
POSUE.
Consider the situation that exists a plurality of UE in very short time, all to initiate uplink synchronous, therefore still may exist plural UE to adopt the same signature sequence in this case, for avoiding conflict, network side can not respond the UE that adopts the same signature sequence when responding in the present embodiment.At this moment, in the above-mentioned steps 23, described base station can generate described FPACH message in such a way:
At first, from the synchronization request that each UE sends, extract the signature sequence of this UE;
Secondly, from the signature sequence that extracts, select the signature sequence that only occurred once, those signature sequences that occurred more than twice will be filtered like this;
Then, with the described corresponding UE of signature sequence that only occurred once, as relevant UE, and then according to described filling position, fill the UpPCH of described relevant UE
POS, make up and obtain described FPACH message.
The multipotency of FPACH message of considering present embodiment carries 8 UpPCH
POSTherefore, when selecting described relevant UE, can control the quantity of described relevant UE smaller or equal to 8.
In the present embodiment, utilize numbering and the corresponding TPLC of the signature sequence of the relevant UE of system message broadcast transmission.Because system message is all UE that send to the inside, a residential quarter, therefore in system message, transmit in the TPLC, also need to carry the numbering of the signature sequence of the UE corresponding with this TPLC, in order to allow this UE know the information that carries its TPLC in this system message.Can carry signature sequence numbering and the corresponding TPLC of more than one UE in the system message, for example, can carry the signature sequence numbering of UE1 and signature sequence numbering and the corresponding TPLC2...... of corresponding TPLC1, UE2, so that corresponding UE detects own signature sequence from system message number after, further extract the TPLC corresponding with this numbering, thereby obtain the TPLC information of self.System message described in the present embodiment preferably can adopt system information block 7 (SIB7).SIB7 is the system message under the idle condition, in the cycle (Millisecond) by system arranges, regularly sends to UE.
After above-mentioned steps 23, UE is according to the TPLC and the UpPCH that extract
POS, to initiate to insert at random, concrete processing mode can be same as the prior art, and the transmitting power of PRACH namely is set according to the TPLC that extracts, and according to the UpPCH that extracts
POSCalculate T launch time of PRACH
TX-PRACH, UE sends Radio Resource connection request message to initiate at random access with described transmitting power at PRACH in described launch time then; Then, the base station is resources such as UE allocated channel after the Radio Resource connection request message that receives the UE transmission, sends the Radio Resource control connection at FACH and sets up message.After this, UE can send the foundation of Radio Resource control connection at DCH and finish message to finish random access procedure.
As can be seen, than prior art, signature reference number and relative subframe numbers can need not be carried again in described FPACH message in embodiment of the invention base station, and described FPACH message can only be filled the UpPCH of UE
POSUnder the situation of the length (88 bit) of the FPACH message that does not change standard code, present embodiment can be filled the UpPCH of 88/11=8 UE at most in FPACH message
POS, namely the base station at most can be simultaneously in a subframe responds the uplink synchronous of 8 UE, thereby has improved the access disposal ability at random of network greatly.
Again the uplink synchronous of UE side in the embodiment of the invention is handled below and described.
Please refer to Fig. 6, the described accidental access method of the embodiment of the invention when being applied to the UE in the TD-SCDMA system, can may further comprise the steps:
Here, the mode of UE transmission uplink synchronization request can be subdivided into following steps:
(1) retransmission counter of signature sequence (for inserting 8 SYNC-UL sequences distributing to UpPTS at random) is set.
(2) the signature sequence transmitting power is set and is the signature initial power.
(3) under given access service grade (ASC, Access Service Classe), select an available UpPCHs subchannel (Sub-channel) and an available signature sequence (SYNC-UL) at random.Random function should guarantee that each subchannel and the selected probability of signature sequence equate.
(4) with selected UpPCH Sub-channel, send a signature sequence with the signature transmitting power.When the signature transmitting power that requires constantly increased and surpasses maximum permissible value, it was maximum permissible value that the signature transmitting power is set.
Here, UE can be according to processing mode same as the prior art after having sent signature sequence, with compatible existing handling process better, minimizing is to the change of existing network: intercept relevant FPACH within an ensuing WT subframe, obtain the affirmation information of network.Concrete, the subframe of UE relation below satisfying reads the FPACH relevant with the UpPCH that has sent
i:
(SFN′?mod?L
i)＝n
RACHi；n
RACHi＝0，...，N
RACHi-1
FPACH wherein
iFor channel number is the FPACH of i, Li is the length of RACH transmission block, n
RACHiBe the channel number of some PRACH of i FPACH correspondence, N
RACHiThe PRACH sum of representing i FPACH correspondence.
For example, suppose that existing network disposes Li=2 at present, only disposed a PRACH, N
RACHi=1, so n
RACHi=0.According to formula (SFN ' mod Li)=n
RACHiI.e. (SFN ' mod 2)=0, that is to say UE only 0,2, the SFN ' of even number such as 4... intercepts FPACH.
Here, the channel number of the UE FPACH that will intercept is determined according to following formula:
FPACH
i＝N?mod?M
Wherein, N represents the signature sequence numbering, and M represents the maximum FPACH quantity of cell configuration.
For example, if network configuration two FPACH, M=2, the FPACH channel number is respectively FPACH
0, FPACH
1, according to formula F PACH
i=N mod M, as can be known:
Sending signature sequence is numbered 0,2,4,6 UE and should intercepts FPACH
0
Sending signature sequence is numbered 1,3,5,7 UE and should intercepts FPACH
1
At present, existing network only disposes 1 FPACH channel usually, number is that 0,1,2,3,4,5,6,7 UE only intercepts FPACH so send signature sequence
0
(6) if UE does not detect effective response within the scheduled time, the signature retransmission counter subtracts 1: if the counter currency, then turns back to (3) the above-mentioned step still greater than 0; Otherwise, report once access failure at random to medium access control (MAC) sublayer.
(7) if UE detects effective response within the scheduled time, that is, from system message, detect the signature sequence numbering of this UE, enter step 63 this moment.
Here, UE extracts the corresponding TPLC of numbering of the signature sequence of self from described system message.Because system message carries the numbering of the signature sequence of this UE, and the UpPCH that carries this UE in the FPACH message then is described
POS, so UE can determine the filling position that this numbering is corresponding according to the numbering of self signature sequence, corresponding filling position extracts self UpPCH from FPACH message then
POSThereby follow-up UE can arrange time and power level value according to these indications that receive.
Here, the TPLC that the UE basis is extracted arranges the transmitting power of PRACH, and according to the UpPCH that extracts
POSCalculate T launch time of PRACH
TX-PRACH, wherein, the calculating of launch time can be same as the prior art, with compatible existing handling process better, reduces the change to existing network:
T
TX-PRACH＝T
RX-PRACH-(UpPCH
ADV+UpPCH
POS-8*16T
C)
Wherein, T
TX-PRACHUnit is 1/8 chip time.
T
TX-PRACH: in the UE timing, UE begins to launch the PRACH time;
T
RX-PRACH: UE regularly in, if PRACH place channel as down channel, the beginning time of reception of channel;
UpPCH
ADVIt is the UpPCH timing advance time;
T
CThe time span of a chip of expression;
(UpPCH
ADV+ UpPCH
POS-8*16T
C) expression PRACH the timing advance time, be UpPCH timing advance time UpPCH
ADVAdd (UpPCH
POS-8*16T
C).
Then, UE sends Radio Resource connection request message to initiate at random access with described transmitting power at PRACH in described launch time.After this, the request of access at random of base station in response UE sends the Radio Resource control connection at FACH and sets up message.After this, UE can send the foundation of Radio Resource control connection at DCH and finish message to finish random access procedure.
Below further specify the embodiment of the invention with respect to the advantage of prior art by table 4, after having used the described method of the embodiment of the invention, suppose in the TD-SCDMA system having 8 UE to send signature sequence SYNC-UL sequence (shown in the row of the 2nd in the table 4) at UpPCH in the same subframe (being the 0th subframe in the table 4) simultaneously in certain residential quarter.Network side can be finished the response to these 8 UE in (i.e. the 1st～2 subframe) in 2 subframes after this, these 8 UE can initiate respectively to insert at random on PRACH0～3 then, thereby handle when realizing that 8 UE insert at random, improved the access disposal ability at random of existing TD-SCDMA system greatly.
Table 4
Corresponding with the described method of above embodiment, the embodiment of the invention also further provides the Apparatus and system of implementing above method.
Please refer to Fig. 7, a kind of base station that the embodiment of the invention provides specifically can comprise:
Receiving element is used for receiving each UE by the uplink synchronization request that UpPCH sends, and carries the signature sequence of described UE in the described uplink synchronization request;
Determining unit is used for determining receiving the starting position UpPCH of the UpPCH of each UE
POS, and according to pre-defined rule, determine the corresponding filling position of numbering of the signature sequence of each UE, described filling position is the UpPCH of described UE
POSBe filled in the position in the FPACH message;
Transmitting element is used for according to described filling position, fills the UpPCH of UE
POSTo generate the FPACH information and sending, and, broadcast numbering and the corresponding transmit power command TPLC on RACH of the signature sequence of relevant UE by system message, so that described relevant UE extracts the corresponding TPLC of numbering of the signature sequence of self from described system message, and corresponding filling position detects separately UpPCH from described FPACH message
POS, and then according to separately TPLC and UpPCH
POS, initiate to insert at random;
Wherein, described relevant UE is filled with its UpPCH in described FPACH message
POSUE.
Here, preferably, described system message can be SIB7; The length of described FPACH message is 88 bits, described UpPCH
POSLength be 11 bits, described FPACH message is only filled the UpPCH of subscriber equipment
POS, and be filled with the UpPCH that is no more than 8 subscriber equipmenies
POS
As a kind of preferred implementation, described transmitting element can comprise:
The FPACH message generation unit is used for from the signature sequence of this UE of synchronization request extraction of each UE transmission; From the signature sequence that extracts, select the signature sequence that only occurred once; With the described corresponding UE of signature sequence that only occurred once, as relevant UE, and then according to described filling position, fill the UpPCH of described relevant UE
POS, make up and obtain described FPACH message.
Please refer to Fig. 8, a kind of UE that the embodiment of the invention provides specifically can comprise:
Transmitting element is used for sending uplink synchronization request by UpPCH to the base station, carries the signature sequence of described UE in the described uplink synchronization request;
Receiving element, be used for receiving system message and the FPACH message that described base station sends, wherein, carry numbering and the corresponding transmit power command on RACH (TPLC) of the signature sequence of described UE in the described system message, carry the UpPCH of described UE in the described FPACH message
POS, and described UpPCH
POSBe described base station according to pre-defined rule, determine the corresponding filling position of numbering of the signature sequence of described UE, and then be filled in the FPACH message according to described filling position;
Obtain the unit, be used for extracting from described system message the corresponding TPLC of numbering of the signature sequence of self, and the filling position of correspondence extracts self UpPCH from described FPACH message
POS
Access unit is used for according to the TPLC and the UpPCH that extract
POS, initiate to insert at random.
Here, described access unit can be further used for arranging according to the TPLC that extracts the transmitting power of PRACH, and according to the UpPCH that extracts
POSCalculate the launch time of PRACH; And send Radio Resource connection request message with described transmitting power at PRACH in described launch time and describedly insert at random initiating.Described system message is preferably SIB7.
The embodiment of the invention also provides a kind of TD-SCDMA communication system, and this system comprises above-described base station and UE.Concrete,
Described base station is used for receiving each UE by the uplink synchronization request that UpPCH sends, and carries the signature sequence of described UE in the described uplink synchronization request; Determine to receive the starting position UpPCH of the UpPCH of each UE
POS, and according to pre-defined rule, determine the corresponding filling position of numbering of the signature sequence of each UE, described filling position is the UpPCH of described UE
POSBe filled in the position in the FPACH message; According to described filling position, fill the UpPCH of UE
POS, with generation FPACH information and sending, and, broadcast numbering and the corresponding transmit power command on RACH (TPLC) of the signature sequence of relevant UE by system message, wherein, described relevant UE is filled with its UpPCH in described FPACH message
POSUE;
Described UE is used for sending described uplink synchronization request by UpPCH to described base station; Receive system message and FPACH message that described base station sends; From described system message, extract the corresponding TPLC of numbering of the signature sequence of self, and corresponding filling position extracts self UpPCH from described FPACH message
POSAccording to the TPLC that extracts and UpPCH
POS, initiate to insert at random.
Many functional parts described in this specification all are called as module, in order to emphasize the independence of its implementation more especially.
In the embodiment of the invention, module can realize with software, in order to carried out by various types of processors.For instance, the executable code module of a sign can comprise one or more physics or the logical block of computer instruction, and for instance, it can be built as object, process or function.However, the executable code of institute's identification module need not to be physically located in together, but can comprise the different instruction on being stored in the coordination not, when combining on these command logics, and its composition module and realize the regulation purpose of this module.
In fact, executable code module can be individual instructions or many instructions, and even can be distributed on a plurality of different code segments, be distributed in the middle of the distinct program, and cross over a plurality of memory devices and distribute.Similarly, operating data can be identified in module, and can realize and be organized in the data structure of any suitable type according to any suitable form.Described operating data can be used as the individual data collection and is collected, and perhaps can be distributed on the diverse location (to be included on the different storage device), and can only be present on system or the network as electronic signal at least in part.
When module can utilize software to realize, consider the level of existing hardware technology, so can be with the module of software realization, do not considering under the condition of cost, those skilled in the art can build the corresponding hardware circuit and realize corresponding function, and described hardware circuit comprises conventional ultra-large integrated (VLSI) circuit or gate array and the existing semiconductor such as logic chip, transistor or other discrete element.Module can also be used programmable hardware device, such as realizations such as field programmable gate array, programmable logic array, programmable logic devices.
The above only is embodiments of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (15)
1. the accidental access method of a TD-SCDMA system is characterized in that, comprising:
The base station receives each subscriber equipment by the uplink synchronization request that ascending pilot channel UpPCH sends, and carries the signature sequence of described subscriber equipment in the described uplink synchronization request;
The starting position UpPCH of the UpPCH of each subscriber equipment is determined to receive in the base station
POS, and according to pre-defined rule, determine the corresponding filling position of numbering of the signature sequence of each subscriber equipment, described filling position is the UpPCH of described subscriber equipment
POSBe filled in the position in the physical access channel FPACH message;
The UpPCH of subscriber equipment is filled according to described filling position in the base station
POSWith generation FPACH information and sending, and, numbering and the corresponding transmit power command TPLC on RACH of the signature sequence of relevant user equipment broadcasted by system message, wherein, described relevant user equipment is to be filled with its UpPCH in described FPACH message
POSSubscriber equipment.
2. the method for claim 1 is characterized in that, described generation FPACH message comprises:
From the synchronization request that each subscriber equipment sends, extract the signature sequence of this subscriber equipment;
From the signature sequence that extracts, select the signature sequence that only occurred once;
With the described corresponding subscriber equipment of signature sequence that only occurred once, as relevant user equipment, and then according to described filling position, fill the UpPCH of described relevant user equipment
POS, make up and obtain described FPACH message.
3. the method for claim 1 is characterized in that, the length of described FPACH message is 88 bits, described UpPCH
POSLength be 11 bits, described FPACH message is only filled the UpPCH of subscriber equipment
POS, and be filled with the UpPCH that is no more than 8 subscriber equipmenies
POS
4. as each described method of claim 1 to 3, it is characterized in that described system message is system information block SIB7.
5. a base station is characterized in that, comprising:
Receiving element is used for receiving each subscriber equipment by the synchronization request that ascending pilot channel UpPCH sends, and carries the signature sequence of described subscriber equipment in the described synchronization request;
Determining unit is used for determining receiving the starting position UpPCH of the UpPCH of each subscriber equipment
POS, and according to pre-defined rule, determine the corresponding filling position of numbering of the signature sequence of each subscriber equipment, described filling position is the UpPCH of described subscriber equipment
POSBe filled in the position in the physical access channel FPACH message;
Transmitting element is used for according to described filling position, fills the UpPCH of subscriber equipment
POSWith generation FPACH information and sending, and, numbering and the corresponding transmit power command TPLC on RACH of the signature sequence of relevant user equipment broadcasted by system message, wherein, described relevant user equipment is to be filled with its UpPCH in described FPACH message
POSSubscriber equipment.
6. base station as claimed in claim 5 is characterized in that, described transmitting element comprises:
The FPACH message generation unit is used for from the signature sequence of this subscriber equipment of synchronization request extraction of each subscriber equipment transmission; From the signature sequence that extracts, select the signature sequence that only occurred once; With the described corresponding subscriber equipment of signature sequence that only occurred once, as relevant user equipment, and then according to described filling position, fill the UpPCH of described relevant user equipment
POS, make up and obtain described FPACH message.
7. base station as claimed in claim 5 is characterized in that, the length of described FPACH message is 88 bits, described UpPCH
POSLength be 11 bits, described FPACH message is only filled the UpPCH of subscriber equipment
POS, and be filled with the UpPCH that is no more than 8 subscriber equipmenies
POS
8. as each described base station of claim 5 to 7, it is characterized in that described system message is system information block SIB7.
9. the accidental access method of a TD-SCDMA system is characterized in that, comprising:
Subscriber equipment sends uplink synchronization request by ascending pilot channel UpPCH to the base station, carries the signature sequence of described subscriber equipment in the described uplink synchronization request;
Described subscriber equipment receives system message and the physical access channel FPACH message that described base station sends, wherein, carry the numbering of signature sequence of described subscriber equipment and the transmit power command TPLC on the corresponding Random Access Channel RACH in the described system message, carry the starting position UpPCH that receives UpPCH of described subscriber equipment in the described FPACH message
POS, and described UpPCH
POSBe described base station according to pre-defined rule, determine the corresponding filling position of numbering of the signature sequence of described subscriber equipment, and then be filled in the FPACH message according to described filling position;
Described subscriber equipment extracts the corresponding TPLC of numbering of the signature sequence of self from described system message, and corresponding filling position extracts self UpPCH from described FPACH message
POS
Described subscriber equipment is according to the TPLC and the UpPCH that extract
POS, initiate to insert at random.
10. method as claimed in claim 9 is characterized in that,
The TPLC that described basis is extracted and UpPCH
POS, initiate to insert at random to comprise:
According to the TPLC that extracts the transmitting power of Physical Random Access Channel PRACH is set, and according to the UpPCH that extracts
POSCalculate the launch time of PRACH;
Send Radio Resource connection request message to initiate described at random access with described transmitting power at PRACH in described launch time.
11., it is characterized in that described system message is system information block SIB7 as claim 9 or 10 described methods.
12. a subscriber equipment is characterized in that, comprising:
Transmitting element is used for sending synchronization request by ascending pilot channel UpPCH to the base station, carries the signature sequence of described subscriber equipment in the described synchronization request;
Receiving element, be used for receiving system message and the physical access channel FPACH message that described base station sends, wherein, carry the numbering of signature sequence of described subscriber equipment and the transmit power command TPLC on the corresponding Random Access Channel RACH in the described system message, carry the starting position UpPCH that receives UpPCH of described subscriber equipment in the described FPACH message
POS, and described UpPCH
POSBe described base station according to pre-defined rule, determine the corresponding filling position of numbering of the signature sequence of described subscriber equipment, and then be filled in the FPACH message according to described filling position;
Obtain the unit, be used for extracting from described system message the corresponding TPLC of numbering of the signature sequence of self, and the filling position of correspondence extracts self UpPCH from described FPACH message
POS
Access unit is used for according to the TPLC and the UpPCH that extract
POS, initiate to insert at random.
13. subscriber equipment as claimed in claim 12 is characterized in that, described access unit is further used for arranging according to the TPLC that extracts the transmitting power of Physical Random Access Channel PRACH, and according to the UpPCH that extracts
POSCalculate the launch time of PRACH; And send Radio Resource connection request message with described transmitting power at PRACH in described launch time and describedly insert at random initiating.
14., it is characterized in that described system message is system information block SIB7 as claim 12 or 13 described subscriber equipmenies.
15. a TD-SCDMA system is characterized in that, this system comprises as each described base station of claim 5 to 8, also comprises as each described subscriber equipment of claim 12 to 14.
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