CN101483913B - Method for implementing base station access by terminal, terminal and base station for implementing the method - Google Patents
Method for implementing base station access by terminal, terminal and base station for implementing the method Download PDFInfo
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Abstract
The invention discloses a method for realizing a terminal accessing to a base station, and a terminal and a base station that realize the method, wherein, the method comprises that: the terminal sends an initial ranging code to the base station, and requests the base station to distribute an initial ranging request bandwidth; under a condition that the base station satisfies a reverse receiving signal-to-noise ratio request, when the number of maximum sub-channels distributed to the terminal by the base station is less than the number of the sub-channels occupied by initial ranging request information, the base station distributes a sub-channel with a number less than that of the maximum sub-channels to the terminal, and informs the terminal to divide the initial ranging request information into a plurality of parts through the sub-channel being distributed and then sends the parts to the base station; the terminal divides the initial ranging request information into a plurality of parts through the sub-channel being distributed and then sends the parts to the base station, or the terminal completely transmits the initial ranging request information to the base station by one time through continuously increasing transmit power and carries out basic capacity negotiation with the base station so as to access to the base station. By the method of the invention, reverse gain and coverage can be increased, and success rate that the terminal accesses to the base station can also be increased.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of terminal and base station of realizing the method for base station access by terminal and realizing this method.
Background technology
In recent years, OFDM (OFDM) technology is owing to can be effectively become the mainstream technology of radio communication physical-layer techniques to anti-multipath interference and narrow band interference, spectrum efficiency height.Code division multiple access (CDMA) technology in the 3rd generation of OFDM (OFDMA)+multiple-input and multiple-output (MIMO) compared with techniques has natural technical advantage, is more suitable for being acknowledged as one of core technology of next generation mobile communication system in wide-band mobile communication system.Worldwide interoperability for microwave access (Worldwide Interoperability for MicrowaveAccess; Abbreviation WiMAX) technology has adopted the OFDMA technology to be the physical layer core technology, and the WiMAX 802.16e standard of taking into account mobility and broadband characteristics is the strong competitor of next generation mobile communication standard.
In the OFDMA system, on time domain, be divided into a plurality of OFDM symbols, on frequency domain, be divided into a plurality of subchannels (Subchannel), each subchannel is the set of one group of subcarrier.Usually, the time-frequency region that a subchannel and one or several OFDM symbol cross are constituted is called time slot (Slot), and time slot is the minimum allocation unit of OFDMA system.Like this, logically just can the physical layer resources of OFDMA frame be represented with the two-dimensional rectangle form that time slot-subchannel constitutes.As shown in Figure 1, a grid is exactly a time slot, for the physical layer resources of terminal distribution is to be the Resource Block of unit with the time slot, generally is similar rectangular block (like IEEE 802.16e), is a kind of T/F structure of two dimension.
T/F two dimension resource has been brought numerous benefits for the OFDMA system, and one of them distinctive advantage is that the terminal oppositely has the sub-channelizing gain, can improve the backward gain at OFDMA terminal.Using the reverse frames structure under subchannel (Partial usage of subchannels the is called for short PUSC) pattern with 1024 parts of WiMax IEEE802.16e system Fourier transform (FFT) as shown in Figure 7 below is the notion of example pine torch channelizing gain.As shown in Figure 7, always have 35 subchannel here, the transmitting power of terminal (MS is also referred to as travelling carriage) (is supposed maximum
P MaxBe 23dBm) can be assigned to fully above the subchannel of actual use, limiting case is
P Max(23dBm) be assigned to (each subcarrier maximum transmission power is 9dbm) on 1 subchannel fully, compare a terminal and take the gain that whole up 35 subchannel have 15.4dB.
Can find out from corresponding up covering sketch map as shown in Figure 5; Along with (direction shown in the arrow of Fig. 5) moved gradually from nearly base sites in the terminal towards the edge, base station, the modulation system at terminal will experience from 64 quadrature amplitude modulation (QAM) to 16QAM, again to phase shift keying (QPSK), add to QPSK then
N RepetitionThe variation of inferior repetition.When the terminal moved to the QPSK zone boundary, the transmitting power at terminal will arrive maximum
P MaxIf the terminal continues outwards to move again,, need to improve backward gain in order to satisfy the requirement of reverse received signal to noise ratio (CINR)---promptly increase reverse the covering.
Then, the terminal needs experience a plurality of steps (access process figure as shown in Figure 2) in access procedure.Can find out by Fig. 2; The initial ranging sign indicating number need be at first sent at the terminal; After ranging code is received in the base station, go up transmission corresponding (Ranging-Rsp) message of range finding and allocated bandwidth indication (CDMA-Allocation-IE, the CDMA sign indicating number distributes indication) at basic connect (Basic Connection).Then; Distance measurement request (Ranging-Request) message need be sent to the base station in the terminal on basic the connection; Receive ranging response (Ranging-Response) message of base station answer when the terminal after, the terminal can continue on basic the connection, to send basic capability negotiating request (SBC-Request) message to the base station.Fig. 3 is the formation sketch map of initial ranging request message; In access procedure; Distance measurement request message process coding back size when doing to switch (HO) is (distance measurement request message is according to different use, and size is different, and size is maximum when doing to switch) about 92byte.Fig. 4 is the formation sketch map of basic capability negotiating request message, is about 179byte in big or small maximum behind the coding.A Slot can carry A Byte, and the distance measurement request message maximum Slot that will take counts B=ceil (92/A) so; The maximum Slot that the basic capability negotiating request message will take counts C=ceil (179/A).Ceil representes to round up, such as ceil [1.2]=2.
According to different time division multiple access (TDD) configuration, the symbol numbers that sub-frame of uplink takies is different.Sub-frame of uplink comprises N
SymbolIndividual symbol; A Slot comprises a subchannel
*D OFDM symbol.The slot number that up subchannel comprises equals N
Symbol/ D.Length is the subchannel number F=ceil (E/ (N of the data occupancy of E (slots unit) so
Symbol/ D)).Theoretically, the subchannel gains G=-10logF that brings with respect to a subchannel of F subchannel.At this moment, be H if the terminal concentrates on the CINR that can reach on the subchannel with full power, to divide full power equally on the F subchannel, can reach CINR be I=H+G=H-10logF at the terminal so.Transfer the needed CINR value of ability if I＜subchannel does not satisfy elementary solution, then the data on the subchannel can not be by the correct parsing in base station.
Use subchannel (Partial Usage of SubChannels with part; Abbreviation PUSC), 2: 1 (TDD of time division multiple access; Descending symbol numbers: up symbol numbers=2: 1) be example: if a Slot comprises 48 data subcarriers; Under QPSK 1/2 modulation coding mode, a Slot can data carried by data amount=48*2*1/2=48bits=6Bytes so.Maximum slot number=ceil (179/6)=30 that maximum slot number=ceil (92/6)=16 that distance measurement request message will take, basic capability negotiating request message will take.The upstream data Slot most number that one subchannel comprises is that 15/3=5 is (because in up part overhead subchannel in addition; Such as range channel, quick feedback (FFB) channel, so the upstream data Slot number that a subchannel comprises maybe be less than 5).The subchannel number that distance measurement request message takies is F
0=ceil (16/5)=4; The subchannel number that the basic capability negotiating request message takies is F
1=ceil (30/5)=6.A relative subchannel, the subchannel gains of distance measurement request message are-6dB that the subchannel gains of basic capability negotiating request message is-7.78dB.Suppose to satisfy the corresponding CINR=6dB of subchannel demodulation Minimum requirements, then:
At the terminal full power is concentrated under the situation of the CINR=18dB that can reach on the subchannel, when distance measurement request message is sent at the terminal, CINR=18-6 >=6dB that each subchannel can reach.When basic capability negotiating message is sent at the terminal, CINR=18-7.78 >=6dB that each subchannel can reach.At this moment, these 2 message can both be by normal reception.At this moment, the part of access process on basic the connection can correctly be accomplished.
At the terminal full power is concentrated under the situation of the CINR=12dB that can reach on the subchannel, when distance measurement request message is sent at the terminal, CINR=12-6=6 >=6dB that each subchannel can reach.When the basic capability negotiating request message is sent at the terminal, CINR=12-7.78＜6dB that each subchannel can reach.At this moment, distance measurement request message can be parsed, and the basic capacity request message is then not all right.The terminal access failure.
At the terminal full power is concentrated under the situation of the CINR=10 that can reach on the subchannel, when distance measurement request message is sent at the terminal, CINR=10-6=4＜6dB that each subchannel can reach.When the basic capability negotiating request message is sent at the terminal, CINR=10-7.78＜6dB that each subchannel can reach.At this moment, distance measurement request message and basic capacity request message all can not be parsed.The terminal access failure.
When the terminal is in the covering edge of base station, along with the distance change of terminal and base station is big, the CINR that equal transmit power can reach will reduce.When cell edge, the terminal will concentrate all power on a few subchannel, to satisfy the modulation demand of QPSK1/2.At this moment; Because the administrative messag on basic the connection oppositely can not burst, the excessive number of subchannels that causes taking of distance measurement request message or basic capability negotiating request message increases, and subchannel gains descends; Cause data can't satisfy the demodulation demand of QPSK1/2; Access process can't be accomplished, and cause the terminal to insert, and influence oppositely covers.
Summary of the invention
One or more problems in view of the above the invention provides a kind of terminal and base station of realizing the method for base station access by terminal and realizing this method.
Method according to the realization base station access by terminal of the embodiment of the invention comprises: the initial ranging sign indicating number is sent to the base station in the terminal, is its distribution initial ranging bandwidth on demand with the request base station; During subchannel number that the maximum subchannel number that under the condition of reverse received signal to noise ratio demand is being satisfied in the base station, can distribute to the terminal takies less than the initial ranging request message; The base station is the subchannel of terminal distribution less than maximum subchannel number, and the notice terminal subchannel that passes through to be distributed is divided into a plurality of parts with the initial ranging request message and sends to the base station; And the terminal subchannel that passes through to be distributed is divided into a plurality of parts with the initial ranging request message and sends to the base station; Or through improving constantly transmitting power with the disposable base station that intactly sends to of initial ranging request message; And carry out basic capability negotiating with the base station, with access base station.
Wherein, to be terminal distribution comprise less than the process of the subchannel of maximum subchannel number in the base station: the subchannel number whether its maximum subchannel number that under the condition that satisfies reverse received signal to noise ratio demand, can distribute to the terminal takies less than the initial ranging request message is judged according to the transmitting power of initial ranging sign indicating number in the base station; If judged result is for being, then the base station is the subchannel of terminal distribution less than maximum subchannel number, and the notice terminal subchannel that passes through to be distributed is divided into a plurality of parts with the initial ranging request message and sends to the base station.
Wherein, the terminal comprises the process that the initial ranging request message sends to the base station through improving constantly transmitting power: the terminal is after improving transmitting power, and the initial ranging bandwidth on demand is distributed for it in the request base station; If can distributing to the maximum subchannel number at terminal under the condition of terminal raising transmitting power, the base station still improves the subchannel number that takies under the condition of transmitting power at the terminal less than the initial ranging request message; Then continue to improve transmitting power and ask the base station be that it distributes initial ranging bandwidth on demand at the terminal; When continue improving the maximum subchannel number that can distribute to the terminal under the condition of transmitting power up to the base station at the terminal and continuing to improve the subchannel number that takies under the condition of transmitting power at the terminal greater than the initial ranging request message, the terminal through the base station for the subchannel of its distribution with the disposable base station that intactly sends to of initial ranging request message.
Wherein, terminal and the base station process of carrying out basic capability negotiating comprises: the terminal request base station is that it distributes the basic capacity agreed bandwidth; Reverse received signal to noise ratio demand under the transmitting power condition of base station during according to terminal request basic capability negotiating bandwidth is calculated and can be distributed to the maximum subchannel number at terminal, and gets less in the amount of bandwidth of maximum subchannel number and terminal request one and distribute to the terminal.
Wherein, if the base station be the insufficient bandwidth of terminal distribution with the complete base station that sends to of basic capability negotiating request message, then transmitting power is improved at the terminal, and after improving transmitting power, to ask the base station again be that it distributes basic capacity agreed bandwidth.
Wherein, If transmitting power repetitive requests base station is improved for after it distributes the number of times of basic capacity agreed bandwidth to reach the particular value of terminal setting in the terminal; The base station still is not enough to the complete base station that sends to of basic capability negotiating request message for the terminal basic capability negotiating bandwidth of its distribution, and then the terminal sends to the base station through the base station for the terminal basic capability negotiating bandwidth of its distribution is divided into a plurality of parts with the basic capability negotiating request message.
Wherein, If the terminal improve transmitting power repetitive requests base station for its number of times that distributes the basic capacity agreed bandwidth before the particular value that reaches the terminal setting; The base station is enough to the disposable base station that intactly sends to of basic capability negotiating request message for the basic capability negotiating bandwidth of its distribution, then the terminal through the base station for the basic capability negotiating bandwidth of its distribution with the complete once base station that sends to of basic capability negotiating request message.
Wherein, be enough to the complete base station that sends to of basic capability negotiating request message if the base station is the bandwidth of terminal distribution, then the terminal through the initial ranging bandwidth on demand with the disposable base station that intactly sends to of basic capability negotiating request message.
Terminal according to the realization said method of the embodiment of the invention comprises: range finding bandwidth request module, be used for sending the initial ranging sign indicating number to the base station, and be terminal distribution initial ranging bandwidth on demand with the request base station; The distance measurement request sending module; During subchannel number that the maximum subchannel number that can distribute to the terminal under being used for satisfying the condition of reverse received signal to noise ratio demand in the base station takies less than the initial ranging request message; The initial ranging request message is divided into a plurality of parts for the subchannel at terminal through base station assigns and sends to the base station, or the transmitting power through improving constantly the terminal is with the disposable base station that intactly sends to of initial ranging request message; And the basic capability negotiating module, be used for carrying out basic capability negotiating, so that base station access by terminal with the base station.
Wherein, the basic capability negotiating module comprises: the agreed bandwidth request unit, and being used to ask the base station is terminal distribution basic capability negotiating bandwidth; The capability negotiation performance element; Be used to judge the base station is whether the basic capability negotiating bandwidth of terminal distribution is enough to the disposable base station that intactly sends to of basic capability negotiating request message; And, the basic capability negotiating request message is divided into a plurality of parts or the disposable base station that intactly sends to through the basic capability negotiating bandwidth according to judged result.
Wherein, The insufficient bandwidth that in the base station is terminal distribution is with under the complete situation that sends to the base station of basic capability negotiating request message; The capability negotiation performance element makes the terminal improve transmitting power, and after transmitting power is improved at the terminal, to make the agreed bandwidth request unit ask the base station again be terminal distribution basic capability negotiating bandwidth.Improving transmitting power, agreed bandwidth request unit repetitive requests base station at the terminal is after the number of times of terminal distribution basic capability negotiating bandwidth reaches the particular value of setting at the terminal; The base station is that the terminal basic capability negotiating bandwidth of terminal distribution still is not enough under the complete situation that sends to the base station of basic capability negotiating request message, and the capability negotiation performance element is that the basic capability negotiating bandwidth of terminal distribution is divided into a plurality of parts with the basic capability negotiating request message and sends to the base station through the base station.Improving transmitting power, agreed bandwidth request unit repetitive requests base station at the terminal is before the number of times of terminal distribution basic capability negotiating bandwidth reaches the particular value of setting at the terminal; The base station is that the basic capability negotiating bandwidth of terminal distribution is enough under the disposable situation that intactly sends to the base station of basic capability negotiating request message, and the capability negotiation performance element is that the basic capability negotiating bandwidth of terminal distribution is with the complete once base station that sends to of basic capability negotiating request message through the base station.
Base station according to the realization said method of the embodiment of the invention comprises: the range finding bandwidth allocation module; During subchannel number that the maximum subchannel number that is used under the condition that satisfies reverse received signal to noise ratio demand, can distributing to the terminal takies less than the initial ranging request message that comes self terminal; Be the subchannel of terminal distribution, and the notice terminal subchannel that passes through to be distributed is divided into a plurality of parts with the initial ranging request message and sends to the base station less than maximum subchannel number; And agreed bandwidth distribution module; During subchannel number that the maximum subchannel number that is used under the condition that satisfies reverse received signal to noise ratio demand, can distributing to the terminal takies less than the basic capability negotiating request message that comes self terminal; Be the subchannel of terminal distribution, and the notice terminal is divided into a plurality of parts through the subchannel of joining with the basic capability negotiating request message and sends to the base station less than maximum subchannel number.
In sum; In the present invention, the maximum subchannel number of base station through judge that the terminal can reach under the condition that satisfies minimum CINR demand, and limit the subchannel number that actual allocated is given the terminal with this; Improve the subchannel gains at terminal, thereby satisfied the CINR demand of subchannel.In addition; In the present invention; The sharding management messages branch multiframe in the bandwidth that the base station limits that allows the terminal to connect basically sends to base station (base station is through the mode success recovery management message of group bag), has improved the reverse coverage at terminal, thereby has improved reverse access success rate.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the logical construction sketch map of upgoing O FDMA frame of the prior art;
Fig. 2 is the signaling process part that in access process, need on basic the connection, send;
Fig. 3 is type lengths values (Type length value, the abbreviation TLV of distance measurement request message.It is made up of 3 parts, means, from T, L just knows the type and the length of this message, just knows the value of this message then from V.Such as TLV=2,1,0, the expression type of message is 2, length is 1byte, value is 0) pie graph;
Fig. 4 is the TLV pie graph of basic capability negotiating request message;
Fig. 5 is the reverse covering sketch map of OFDMA system;
Fig. 6 is the flow chart according to the method for the realization base station access by terminal of the embodiment of the invention; And
Fig. 7 is the subchannel gains sketch map.
Embodiment
With reference to accompanying drawing, specify embodiment of the present invention below.
Method according to the realization base station access by terminal of the embodiment of the invention comprises following content: the initial ranging sign indicating number is sent to the base station in the terminal, is its distribution initial ranging bandwidth on demand with the request base station; During subchannel number that the maximum subchannel number that under the condition of reverse received signal to noise ratio demand is being satisfied in the base station, can distribute to the terminal takies less than the initial ranging request message; The base station is the subchannel of terminal distribution less than maximum subchannel number, and the notice terminal subchannel that passes through to be distributed is divided into a plurality of parts with the initial ranging request message and sends to it; And the terminal subchannel that passes through to be distributed is divided into a plurality of parts with the initial ranging request message and sends to the base station; Or through improving constantly transmitting power with the disposable base station that intactly sends to of initial ranging request message; And carry out basic capability negotiating with the base station, with access base station (detailed process is as shown in Figure 6).
For convenience of description, define following variable at present:
1) CINR
Rangingcode: measure the CINR that ranging code obtains;
2) N
Coae-subchannel: the subchannel number that ranging code takies;
3) Thresh_req: the demodulation threshold of data-message;
4) Max_SubChannel: the maximum that satisfies the subchannel number of CINR demodulation demand; And
5) N
Ranging-req: the subchannel number that distance measurement request message takies.
Particularly, the terminal request base station is that it distributes distance measurement request bandwidth, and the process of sending distance measurement request message and receiving the ranging response message of base station to the base station may further comprise the steps:
A. the ranging code that sends of base station receiving terminal.Wherein, the CINR=CINR of ranging code
Rangingcode, the subchannel number that takies is N
Code-subchannel(=6), data area demodulation threshold are Thresh_req (=6).According to above parameter, under the constant situation of the total transmitting power in terminal, when satisfying data field demodulation CINR demand, the maximum subchannel number at terminal can be distributed in the base station
, obtain the restriction of maximum subchannel number after, forward step B to.
B. the maximum subchannel number N that under the QPSK1/2 situation, takies of distance measurement request message
Ranging-req=4.If Max_SubChannel>=N
Ranging-req, then with the distance measurement request message complete send to the base station, this distance measurement request message can correctly be resolved in the base station, forwards step M to, otherwise forwards step C to.
C.Max_SubChannel＜N
Ranging-reqGive the terminal even if also just mean the abundant bandwidth of base station assigns, the terminal can send to the base station apart from request message with whole measuring, and the base station can not correctly be resolved.At this moment, base station subsidiary next message after the range finding corresponding message needs the indication of burst, and the corresponding message of will finding range sends to the terminal.Structure (for the first time) CDMA-Allocation-IE distributes the bandwidth that is no more than the Max_SubChannel subchannel to give the terminal.
D. after (for the first time) CDMA-Allocation-IE and range finding corresponding message are received in the terminal, know that the ranging code process completes successfully, can carry out the flow process of distance measurement request message.If the not subsidiary burst indication of range finding corresponding message forwards step e so to, otherwise forwards step F to.
E. send distance measurement request message to the base station according to the bandwidth of base station assigns, forward step M to.
F. this moment, complete distance measurement request message can't be sent to the base station in the terminal under the constant situation of maximum transmission power, and it has 2 selections: 1) lifting transmitting power forwards step G to; 2) burst that sends distance measurement request message forwards step H to the base station.
G. the terminal improves constantly transmitting power, attempts the range finding flow process, up to receiving the range finding corresponding message of not being with the burst indication.After receiving the range finding corresponding message of not being with the burst indication, forward step M to.If the transmitting power promotion at terminal behind maximum transmission power, also can not receive the range finding corresponding message of not being with the burst indication, then forward step H to.
H. the terminal is according to the bandwidth of base station assigns, and the burst that sends distance measurement request message forwards step I to the base station.
I. the burst of distance measurement request message is successfully received in the base station, the distance measurement request message burst that buffer memory is received.If after receiving fragmental messages, can accomplish the reorganization of distance measurement request message, forward step J to, otherwise forward step K to.
J. the distance measurement request of recombinating message is calculated in the maximum subchannel number restriction of satisfying under the basic demodulation ability through the CINR that receives.And, forward step M then to this restriction as the distribution bandwidth.
K. calculate in the maximum subchannel number restriction of satisfying under the basic demodulation ability through the CINR that receives.Transmission comprises with the CDMA-Allocation-IE second time of for the first time identical ranging code and ranging code frame number gives the terminal, and distributing bandwidth is the maximum bandwidth that is no more than maximum subchannel restriction, forwards step L then to.
L. the terminal is received and is comprised and the for the first time identical ranging code and the CDMA-Allocation-IE of ranging code frame number, utilizes the bandwidth of distributing to send the remaining content of distance measurement request message (burst), forwards step I then to.
M. the ranging response message that send the base station is received at the terminal.This message flow is accomplished, and gets into next message flow.
After the range finding flow process is accomplished at the terminal, get into basic capability negotiating flow process with the base station.As shown in Figure 2, the terminal is sent SBC-Request and is given the base station, after SBC-Request is successfully received in the base station, sends SBC-Response and gives the terminal, and after SBC-Response was received at the terminal, the basic capability negotiating flow process was accomplished.Particularly, may further comprise the steps according to the terminal of the embodiment of the invention and the basic capability negotiating flow process between the base station:
A. whether the bandwidth of the transmission distance measurement request message of terminal judges base station assigns is enough to send complete basic capacity request message.If be enough to, then forward step e to, otherwise forward step B to.
B. the terminal is after receiving ranging response message, and the bandwidth number of times of the base station assigns received is counted.Suppose that counting is N, the maximum of the allocated bandwidth number of times that the terminal is provided with is M.Then have following 2 kinds of situation: 1) if N (＜M) inferior allocated bandwidth all is not enough to send SBC-Request message, then the terminal promotes transmitting power, continues to send the bandwidth application.Forward step C to.If N (=M) inferior allocated bandwidth all is not enough to send SBC-Request message; Then the base station is arrived according to the burst of the bandwidth transmission basic capability negotiating request message of the nearest maximum of distributing in base station in the terminal; Stop to receive the counting of bandwidth of base station, before sending the residue burst of accomplishing basic capacity message, set N=M.Forward step D to.2) if within N time, the bandwidth of enough sending SBC-Request of base station assigns is received at the terminal, then forwards step e to.
C. the base station maximum subchannel restriction of calculating according to CINR and the amount of bandwidth of terminal to apply get the small value, and distribute bandwidth to the terminal, forward steps A to.
D. the burst of basic capacity negotiation request message is successfully received in the base station, if can recombinate basic capability negotiating message, then forwards step e to, otherwise the burst that the base station buffer memory is received forwards step C to.
E. after the basic capacity negotiation request message is successfully received in the base station, send the basic capability negotiating response message and give the terminal, this flow process is accomplished.
The similar basic capability negotiating message flow of other Message Processing flow processs on basic the connection.
Below with an application example to the present invention's further explanation in addition.
As shown in Figure 5, along with (direction shown in the arrow of Fig. 5) moved gradually from nearly base sites in the terminal towards the edge, base station, the modulation system at terminal will experience from 64QAM to 16QAM, again to PSK, add N to QPSK then
RepetitionThe variation of inferior repetition, when the terminal moved to the QPSK zone boundary, the transmitting power at terminal will arrive maximum P
Max
Under the situation of up PUSC, TDD 2:1; When a user prepares to initiate to insert in the zone of QPSK1/2; Suppose that this moment is in order to satisfy the CINR requirement of basic demodulation demand; Need on one subchannel to send data with the power of 20dBm, data (the terminal maximum transmission power is 23dBm) can only be sent with 2 subchannel at most in the terminal so, otherwise can not satisfy the CINR demand.That is to say that in this case, 5 (Slots) * 2 (subchannel) * 6 (Slot carries 6Bytes)=60Bytes at most once can only be sent in the terminal.If surpass 60Bytes, will cause subchannel gains to descend, can't satisfy the CINR demand.
With reference to figure 2, the flow process according to the realization base station access by terminal of the embodiment of the invention is described:
1. the base station assigns bandwidth is given the terminal
101. after the initial ranging sign indicating number that sends at the terminal is received in the base station, distribute a wide terminal (being assumed to be ABytes) of giving of initial ranging request through CDMA-Allocation-IE.After this bandwidth is received at the terminal, send distance measurement request message with the bandwidth (A Bytes) of base station assigns, and the range finding message size is B, the so actual shared bandwidth C=min{A of data that sends to the base station, B}.C can be regarded as shared number of subchannels D=ceil (ceil (C/6)/5)).
102. the fragmental messages that the base station buffer memory is received, because the just fragmental messages that receive the base station is not given the terminal so can not send Ranging-Response (it is corresponding to find range) message.And initiatively send bandwidth and give terminal (sending the CDMA Allocation IE of identical Ranging Code and FrameNo).The remaining bandwidth of setting distance measurement request message is F, the bandwidth G=min{F that comprises among the CDMA Allocation IE so, and 60} can not be greater than thresholding.Remaining fragmental messages is sent with the bandwidth (G Bytes) of this sub-distribution in the terminal.
2. the data that send at the terminal are received in the base station
If 201. D＞2, the CINR on the subchannel can't be satisfied so, the message base station of transmission also can't correctly be understood.Forward step 3 to.
If 202. D＜=2, the CINR on the subchannel is satisfied so, the message base station of transmission also can correctly be read.Forward step 4 to.
3. the data that send at the terminal can't be resolved in the base station
301. the maximum subchannel number that allows under the basic demodulation CINR conditions of demand is being satisfied according to the power calculation on the subchannel of receiving in the base station, in this example, and N=2.
302. owing to distance measurement request message is not done, so the terminal will be initiated ranging code once more.After ranging code is received in the base station, can distribute CDMA-Allocation-IE to give the terminal equally, at this moment, base station assigns is used to send the bandwidth E=min{60 of distance measurement request message, A} to the terminal.And this message is sent to the terminal.
303. after this bandwidth is received at the terminal, find that the bandwidth of distribution can't satisfy the transmission whole measuring apart from request message, will carry out burst to this message so, the burst that sends range finding message is to the base station, and the total bandwidth of assurance transmission can not surpass E.Jump to step 2.
4. the data that send at the terminal are successfully resolved in the base station
401. these data are the message of complete basic connection, jump to step 5.
402. these data are not the message of complete basic connection, jump to step 102.
5. the initial ranging request message sends successfully.
After initial range finding flow process is accomplished; On basic the connection, also need other flow processs; Process is similar with the range finding flow process, difference be following some: the terminal can not sent ranging code and given the base station, but send a request message (such as the basic capability negotiating request message) is to the base station; After the fragmental messages of correctly receiving in the basic connection, need not distribute bandwidth to give the terminal through the mode of sending CDMA Allocation IE, but distribute bandwidth to give the terminal through the mode of initiatively confirming (Grant).
In sum; In the present invention, the maximum subchannel number of base station through judge that the terminal can reach under the condition that satisfies minimum CINR demand, and limit the subchannel number that actual allocated is given the terminal with this; Improve the subchannel gains at terminal, thereby satisfied the CINR demand of subchannel.In addition; In the present invention; The sharding management messages branch multiframe in the bandwidth that the base station limits that allows the terminal to connect basically sends to base station (base station is through the mode success recovery management message of group bag), has improved the reverse coverage at terminal, thereby has improved reverse access success rate.
The above is merely embodiments of the invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (14)
1. a method that realizes base station access by terminal is characterized in that, comprising:
The initial ranging sign indicating number is sent to the base station in the terminal, distributes the initial ranging bandwidth on demand to ask said base station for it;
During subchannel number that the maximum subchannel number that under the condition of reverse received signal to noise ratio demand is being satisfied in said base station, can distribute to said terminal takies less than the initial ranging request message; Said base station is the subchannel of said terminal distribution less than said maximum subchannel number, and the subchannel of notifying said terminal to pass through to be distributed is divided into a plurality of parts with said initial ranging request message and sends to said base station; And
The subchannel that said terminal passes through to be distributed is divided into a plurality of parts with said initial ranging request message and sends to said base station; Or intactly send to said base station with said initial ranging request message is disposable through improving constantly transmitting power; And carry out basic capability negotiating with said base station, to insert said base station.
2. method according to claim 1 is characterized in that, to be said terminal distribution comprise less than the process of the subchannel of said maximum subchannel number in said base station:
The subchannel number whether its maximum subchannel number that under the condition that satisfies said reverse received signal to noise ratio demand, can distribute to said terminal takies less than said initial ranging request message is judged according to the transmitting power of said initial ranging sign indicating number in said base station;
If judged result is for being, then said base station is the subchannel of said terminal distribution less than said maximum subchannel number, and the subchannel of notifying said terminal to pass through to be distributed is divided into a plurality of parts with said initial ranging request message and sends to said base station.
3. method according to claim 1 and 2 is characterized in that, said terminal comprises the process that said initial ranging request message sends to said base station through improving constantly transmitting power:
Said terminal asks said base station to distribute said initial ranging bandwidth on demand for it after improving transmitting power;
If can distributing to the maximum subchannel number at said terminal under the condition of said terminal raising transmitting power, said base station still improves the subchannel number that takies under the condition of transmitting power at said terminal less than said initial ranging request message; Then said terminal continues to improve transmitting power and ask said base station to distribute said initial ranging bandwidth on demand for it; When continuing to improve the maximum subchannel number that can distribute to said terminal under the condition of transmitting power up to said base station at said terminal and continuing to improve the subchannel number that takies under the condition of transmitting power at said terminal greater than said initial ranging request message, said terminal intactly sends to said base station for the subchannel of its distribution with said initial ranging request message is disposable through said base station.
4. method according to claim 3 is characterized in that, the process that basic capability negotiating is carried out in said terminal and said base station comprises:
The basic capacity agreed bandwidth is distributed for it in the said base station of said terminal request;
Reverse received signal to noise ratio demand under the transmitting power condition of said base station during according to the said basic capability negotiating bandwidth of said terminal request is calculated and can be distributed to the maximum subchannel number at said terminal, and gets less in the amount of bandwidth of said maximum subchannel number and said terminal request one and distribute to said terminal.
5. method according to claim 4; It is characterized in that; If said base station is that the insufficient bandwidth of said terminal distribution is to send to said base station with said basic capability negotiating request message is complete; Transmitting power is improved at then said terminal, and after improving transmitting power, asks said base station to distribute said basic capability negotiating bandwidth for it again.
6. method according to claim 5; It is characterized in that; If the said base station of transmitting power repetitive requests is improved for after it distributes the number of times of said basic capability negotiating bandwidth to reach the particular value of said terminal setting in said terminal; Said base station still is not enough to send to said base station with said basic capability negotiating request message is complete for the said basic capability negotiating bandwidth of its distribution, and then said terminal sends to said base station through said base station for the said basic capability negotiating bandwidth of its distribution is divided into a plurality of parts with said basic capability negotiating request message.
7. method according to claim 5; It is characterized in that; If said terminal improve the said base station of transmitting power repetitive requests for its number of times that distributes said basic capability negotiating bandwidth before the particular value that reaches the setting of said terminal; Said base station is enough to intactly send to said base station with said basic capability negotiating request message is disposable for the said basic capability negotiating bandwidth of its distribution, and then said terminal sends to said base station for the said basic capability negotiating bandwidth of its distribution with said basic capability negotiating request message is complete once through said base station.
8. method according to claim 4; It is characterized in that; Be enough to send to said base station with said basic capability negotiating request message is complete if said base station is the bandwidth of said terminal distribution, then said terminal intactly sends to said base station through said basic capability negotiating bandwidth with said basic capability negotiating request message is disposable.
9. a terminal of realizing above-mentioned each said method is characterized in that, comprising:
Range finding bandwidth request module is used for sending the initial ranging sign indicating number to the base station, is said terminal distribution initial ranging bandwidth on demand to ask said base station;
The distance measurement request sending module; During subchannel number that the maximum subchannel number that can distribute to said terminal under being used for satisfying the condition of reverse received signal to noise ratio demand in said base station takies less than the initial ranging request message; Said initial ranging request message is divided into a plurality of parts for the subchannel at said terminal through said base station assigns and sends to said base station, or the transmitting power through improving constantly said terminal intactly sends to said base station with said initial ranging request message is disposable; And
The basic capability negotiating module is used for carrying out basic capability negotiating with said base station, so that said base station is inserted at said terminal.
10. terminal according to claim 9 is characterized in that, said basic capability negotiating module comprises:
The agreed bandwidth request unit, being used to ask said base station is said terminal distribution basic capability negotiating bandwidth;
The capability negotiation performance element; Be used to judge whether said basic capability negotiating bandwidth is enough to intactly send to said base station with the basic capability negotiating request message is disposable; And, through said basic capability negotiating bandwidth said basic capability negotiating request message is divided into a plurality of parts or disposable and intactly sends to said base station according to judged result.
11. terminal according to claim 10; It is characterized in that; Said basic capability negotiating insufficient bandwidth with the complete situation that sends to said base station with said basic capability negotiating request message under; Said capability negotiation performance element makes said terminal improve transmitting power, and after transmitting power is improved at said terminal, to make said agreed bandwidth request unit ask said base station again be the said basic capability negotiating bandwidth of said terminal distribution.
12. terminal according to claim 11; It is characterized in that; Improving transmitting power, the said base station of said agreed bandwidth request unit repetitive requests at said terminal is after the number of times of the said basic capability negotiating bandwidth of said terminal distribution reaches the particular value of setting at said terminal; Said base station is that the said basic capability negotiating bandwidth of said terminal distribution still is not enough under the complete situation that sends to said base station of said basic capability negotiating request message, and said capability negotiation performance element is that the said basic capability negotiating bandwidth of said terminal distribution is divided into a plurality of parts with said basic capability negotiating request message and sends to said base station through said base station.
13. terminal according to claim 12; It is characterized in that; Improving transmitting power, the said base station of said agreed bandwidth request unit repetitive requests at said terminal is before the number of times of the said basic capability negotiating bandwidth of said terminal distribution reaches the particular value of setting at said terminal; Said base station is that the said basic capability negotiating bandwidth of said terminal distribution is enough under the disposable situation that intactly sends to said base station of said basic capability negotiating request message, and said capability negotiation performance element is that the said basic capability negotiating bandwidth of said terminal distribution sends to said base station with said basic capability negotiating request message is complete once through said base station.
14. a base station of realizing each said method of aforesaid right requirement 1-8 is characterized in that, comprising:
The range finding bandwidth allocation module; During subchannel number that the maximum subchannel number that is used under the condition that satisfies reverse received signal to noise ratio demand, can distributing to the terminal takies less than the initial ranging request message that comes self terminal; Be the subchannel of said terminal distribution, and the subchannel of notifying said terminal to pass through to be distributed is divided into a plurality of parts with said initial ranging request message and sends to said base station less than said maximum subchannel number;
And
The agreed bandwidth distribution module; During subchannel number that the maximum subchannel number that is used under the condition that satisfies said reverse received signal to noise ratio demand, can distributing to said terminal takies less than the basic capability negotiating request message from said terminal; Be the subchannel of said terminal distribution, and the subchannel of notifying said terminal to pass through to be distributed is divided into a plurality of parts with said basic capability negotiating request message and sends to said base station less than said maximum subchannel number.
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| CN102026347B (en) * | 2010-12-20 | 2016-06-15 | 中兴通讯股份有限公司 | The launching technique of a kind of uplink distance measurement signals and system thereof |
| CN102625464A (en) * | 2011-03-31 | 2012-08-01 | 北京新岸线无线技术有限公司 | Method and device for accessing wireless networks |
| CN102917428B (en) * | 2011-08-05 | 2018-03-20 | 北京新岸线移动多媒体技术有限公司 | Channel switching method and device |
| CN110611558B (en) * | 2019-10-16 | 2022-04-22 | 深圳前海中电慧安科技有限公司 | Method and device for collecting mobile terminal information, collecting equipment and storage medium |
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| CN1882159A (en) * | 2005-03-09 | 2006-12-20 | 三星电子株式会社 | System and method for performing ranging process in a communication system |
| CN101047880A (en) * | 2006-03-31 | 2007-10-03 | 华为技术有限公司 | Message transmission method and system |
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| CN1882159A (en) * | 2005-03-09 | 2006-12-20 | 三星电子株式会社 | System and method for performing ranging process in a communication system |
| CN101047880A (en) * | 2006-03-31 | 2007-10-03 | 华为技术有限公司 | Message transmission method and system |
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