CN101136719B - Link level simulation method of time division multiplexing forward channel - Google Patents
Link level simulation method of time division multiplexing forward channel Download PDFInfo
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- CN101136719B CN101136719B CN200610144919A CN200610144919A CN101136719B CN 101136719 B CN101136719 B CN 101136719B CN 200610144919 A CN200610144919 A CN 200610144919A CN 200610144919 A CN200610144919 A CN 200610144919A CN 101136719 B CN101136719 B CN 101136719B
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Abstract
The method includes steps: S102, base station (BS) creates new data packet; S104, BS sends out timeslot of data packet orderly at scheduled time slot interleaving places, and mobile station (MS) demodulates the received data of timeslot; if MS adjusts the received interference, then going to S108; if demodulation operation is not successful, then method goes to S104 in condition of maximum number of time slot allowed transmission is not reached, otherwise, MS adjusts the interference, and goes to S108; S108 BS determines whether required maximum number of data packet is reached; if yes, then going to S110, otherwise gong to S102; S110, obtaining average interference through interference of MS so as to obtain simulated result.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of link level simulation method of time division multiplexing forward channel.
Background technology
CDMA2000 EV-DO (Evolution of Data Optimized; Evolution data optimization) is a kind of wireless tranmission techniques that aims at mobile data applications and carried out optimization; With mainly be in order to optimize the 1x compared with techniques of voice and moderate rate transfer of data; The EV-DO technology has been done to optimize and improve to aspects such as capacity, message transmission rate and wireless interconnected accesses, and fl transmission adopts time division multiplexing mode, and reverse transfer adopts the code division multiplexing mode.
So-called link is meant the air traffic channel that connects base station and travelling carriage.Link simulation is meant through the process simulation wireless signal transmission and experiences the signal recovery situation behind the various wireless channels, finally exports the relation curve or the data of Packet Error Ratio and signal to noise ratio and some other reflection link performance.
The description of the document " Recommended Minimum PerformanceStandards for cdma2000 High Rate Packet Data Access Terminal " that provides according to 3GPP2; The link level simulation of CDMA2000 EV-DO forward link mainly is through under the constant situation of the available power that receives of hypothesis mobile phone, through revising interference (comprising the interference of white Gaussian noise and other sub-district) acquisition mobile phone that mobile phone receives at the relation curve between Packet Error Ratio and the signal to noise ratio under the different channels transmission environment.Because CDMA2000 EV-DO forward link adopts time-multiplexed mode to transmit data; So can not as the reverse link that adopts code division multiplexing, obtain the reverse performance curve between Packet Error Ratio and the signal to noise ratio rapidly and accurately through power control; Disturb rank possibly obtain certain Packet Error Ratio and can only which kind of estimate to set, have a strong impact on testing efficiency through tentative test constantly.
Therefore, need the grade simulated technical scheme of a kind of CDMA2000EV-DO forward link, obstructed overpower controls the relation that quick and precisely must obtain between Packet Error Ratio and the signal to noise ratio.
Summary of the invention
Main purpose of the present invention is to provide a kind of link level simulation method of time division multiplexing forward channel; Be used for judging through the decoding situation of butt joint packet receiving; Adjust the interference that mobile phone receives according to certain strategy; Thereby obtain the corresponding relation between Packet Error Ratio and the signal to noise ratio rapidly and accurately, improve testing efficiency.
To achieve these goals, the invention provides a kind of link level simulation method of time division multiplexing forward channel.This link level simulation method may further comprise the steps:
Step S102, the base station generates new packet, is used to carry out emulation;
Step S104, the time slot of packet is sequentially sent at the predetermined time slot intervening portion in the base station, and travelling carriage carries out demodulation to the time slot data that received;
Step S106, if the demodulation success, then travelling carriage disturbs it increases by first step-length; Proceed to step S108, if demodulation is unsuccessful, under the situation of the maximum timeslot number that then allows to transmit not reaching; Proceed to step S104; Allow reaching under the situation of maximum timeslot number of transmission, travelling carriage disturbs it to reduce by second step-length, proceed to step S108;
Step S108, whether base station judges reaches desired maximum data packet number, if reach, then proceeds to step S110, if do not reach, then proceeds to step S102;
Step S110, statistics is removed the average interference that travelling carriage obtains in the residue bag process of transmitting behind the predetermined quantity bag of beginning, through average interference, calculates the corresponding relation between Packet Error Ratio and the signal to noise ratio, thereby draws simulation result.
Further, in step S104, travelling carriage carries out demodulation through CRC.
Further, in step S106, first step-length/(first step-length+second step-length)=desired Packet Error Ratio.
In simulation process, the predetermined time slot intervening portion is constant, and the form of packet is constant, and the available power that travelling carriage receives is constant.
Pass through technique scheme; The interference that the present invention receives through continuous adjustment mobile phone in simulation process obtains the Packet Error Ratio of expectation; Avoid the exploratory test carried out for the Packet Error Ratio that obtains expectation, greatly improved the grade simulated speed of CDMA2000EV-DO forward link.
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 flow chart according to the link level simulation method of time division multiplexing forward channel of the present invention;
Fig. 2 is the block diagram according to the link level simulating system of time division multiplexing forward channel of the present invention;
Fig. 3 is the concrete realization flow figure according to the embodiment of the invention; And
Fig. 4 is the sketch map according to the CDMA2000 EV-DO forward link intervening portion of the embodiment of the invention.
Embodiment
Specify the present invention below with reference to accompanying drawing.
With reference to Fig. 1, may further comprise the steps according to the link level simulation method of time division multiplexing forward channel of the present invention:
Step S102, the base station generates new packet, is used to carry out emulation.
Step S104, the time slot of packet is sequentially sent at the predetermined time slot intervening portion in the base station, and travelling carriage carries out demodulation to the time slot data that received.
Travelling carriage carries out demodulation through CRC.
If step S106 is demodulation success, then its interference of travelling carriage adjustment; Proceed to step S108, if demodulation is unsuccessful, under the situation of the maximum timeslot number that then allows to transmit not reaching; Proceed to step S104; Allow reaching under the situation of maximum timeslot number of transmission, its interference of travelling carriage adjustment proceeds to step S108.
If the demodulation success, then travelling carriage disturbs it increases by first step-length; If demodulation is unsuccessful, allows reaching under the situation of maximum timeslot number of transmission, travelling carriage makes its interference minimizing second step-length.Preferably, first step-length/(first step-length+second step-length)=desired Packet Error Ratio.
Step S108, whether base station judges reaches desired maximum data packet number, if reach, then proceeds to step S110, if do not reach, then proceeds to step S102.
Step S110 through the interference acquisition average interference of travelling carriage, thereby draws simulation result.
Through average interference, calculate the corresponding relation between Packet Error Ratio and the signal to noise ratio.
In simulation process, the predetermined time slot intervening portion is constant, and the form of packet is constant, and the available power that travelling carriage receives is constant.
With reference to Fig. 2, comprise according to the link level simulating system 10 of time division multiplexing forward channel of the present invention: base station 20, be used to generate new packet, sequentially send the time slot of packet at the predetermined time slot intervening portion; Travelling carriage 30 is used for the time slot data that received are carried out demodulation, under the demodulation case of successful adjustment its disturb, unsuccessful and reached under the situation of the maximum timeslot number that institute allows to transmit and adjust its interference in demodulation; Emulation module 40 is used for obtaining average interference through the interference of travelling carriage 30, draws simulation result.Wherein, Unsuccessful under the demodulation case of successful or in demodulation and reached under the situation of the maximum timeslot number that institute allows to transmit, base station 20 judges whether to reach desired maximum data packet number, if reach; Then calculate by emulation module 40; If do not reach, then base station 20 generates new packet, continues to send data.
Further, travelling carriage 30 is used for carrying out demodulation through CRC.
Further, travelling carriage 30 is used under the demodulation case of successful, and it is disturbed increases by first step-length; Unsuccessful and reached under the situation of maximum timeslot number that institute allows transmission in demodulation, make its interference minimizing second step-length.Preferably, first step-length/(first step-length+second step-length)=desired Packet Error Ratio.
Further, emulation module 40 is used for calculating the corresponding relation between Packet Error Ratio and the signal to noise ratio through average interference.
In simulation process, the predetermined time slot intervening portion is constant, and the form of packet is constant, and the available power that travelling carriage 30 receives is constant.
The invention belongs to wireless communication field; The link level simulation technology that relates to forward channel in the CDMA2000 EV-DO standard; The control method that specifically relates to the grade simulated middle Packet Error Ratio (PER, Packet Error Rate) of forward channel link in the CDMA2000 EV-DO standard.The concrete steps of the controlled emulation mode of Packet Error Ratio are following in the grade simulated process of CDMA2000 EV-DO forward link that the present invention proposes:
Whether the first step, base station judges reach the desired transmission bag of this simulation process number, change for the 4th step over to if reach, otherwise send a certain formatted data bag in a certain fixing time slot interleaving position s time slot (the 1.667ms) (s=1 of (maximum allow transmission N time slot); 2 ..., N), mobile phone carries out demodulation to the data that receive; If successful demodulation (through CRC) then changed for second step over to, if there is not successful demodulation; Judge then whether current time slots s equals the maximum transmitted time slot N that this packet allows transmission, if be not equal to maximum transmitted time slot N, then s=s+1; Continue the first step,, changed for the 3rd step over to if equal maximum transmitted time slot N;
In second step, adjust the interference I that mobile phone receives in the simulation process according to formula (1)
Oc, with seasonal s=1, the base station produces new packet, changes the first step over to;
I
oc＝I
oc+UpStep (1)
In the 3rd step, adjust the interference I that mobile phone receives in the simulation process according to formula (2)
Oc,, change the first step over to seasonal s=1;
I
oc＝I
oc-DownStep (2)
In the 4th step, emulation finishes, and removes the I that obtains in some bags back residue bag process of transmitting of beginning in the statistics whole simulation process
OcAverage
As the average interference in the simulation process, through
Calculate the Packet Error Ratio that obtains in this simulation process and the corresponding relation of signal to noise ratio.
It may be noted that; In the link level simulation process, the base station sends to the time slot interleaving invariant position of mobile phone, and the form of packet is constant; The continuous change at random of content meeting of packet; The available power that mobile phone receives is constant, and UpStep, these two parameters of DownStep are relevant with the Packet Error Ratio PER that emulation needs in addition, see formula (3).
As shown in Figure 3; The base station at first judges whether to reach the desired bag number of this emulation in the emulation, if do not have, then produces the packet of this new emulation prescribed form; And the time slot interleaving position of in this emulation, stipulating (be assumed to be label shown in Figure 4 be 1 time slot interleaving position) sent first time slot of this packet; Mobile phone is decoded to it after receiving these time slot data, if successfully decoding is then disturbed I according to formula (1) adjustment
Oc, and produce new packet, otherwise judge whether this time slot is the maximum time slot that this packet allows transmission, if then disturb I according to formula (2) adjustment
OcAnd produce new packet, continue in Fig. 4 label if not base station then and be the next time slot that this packet is sent in 1 time slot interleaving position, by that analogy.
In the emulation; If it is 1% o'clock corresponding signal to noise ratio that expectation obtains a certain formatted data bag Packet Error Ratio; Then can make UpStep=0.005, DownStep=0.495 according to formula (3); Perhaps UpStep=0.005, DownStep=0.05 (simplification), perhaps other satisfies the UpStep, DownStep of formula (3) or to its simplification of carrying out.
The above is merely the preferred embodiments of the present 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 protection scope of the present invention.
Claims (4)
1. the link level simulation method of a time division multiplexing forward channel is characterized in that, may further comprise the steps:
Step S102, the base station generates new packet, is used to carry out emulation;
Step S104, the time slot of said packet is sequentially sent at the predetermined time slot intervening portion in said base station, and travelling carriage carries out demodulation to the time slot data that received;
Step S106, if the demodulation success, then said travelling carriage disturbs it increases by first step-length; Proceed to step S108, if demodulation is unsuccessful, under the situation of the maximum timeslot number that then allows to transmit not reaching; Proceed to step S104; Allow reaching under the situation of maximum timeslot number of transmission, said travelling carriage disturbs it to reduce by second step-length, proceed to step S108;
Step S108, whether said base station judges reaches desired maximum data packet number, if reach, then proceeds to step S110, if do not reach, then proceeds to step S102;
Step S110, statistics is removed the average interference that travelling carriage obtains described in the residue bag process of transmitting behind the predetermined quantity bag of beginning, through said average interference, calculates the corresponding relation between Packet Error Ratio and the signal to noise ratio, thereby draws simulation result.
2. link level simulation method according to claim 1 is characterized in that, in step S104, said travelling carriage carries out demodulation through CRC.
3. link level simulation method according to claim 1 is characterized in that, said first step-length/(said first step-length+said second step-length)=desired Packet Error Ratio.
4. according to each described link level simulation method in the claim 1 to 3, it is characterized in that said predetermined time slot intervening portion is constant, the form of said packet is constant, and the available power that said travelling carriage receives is constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610144919A CN101136719B (en) | 2006-11-22 | 2006-11-22 | Link level simulation method of time division multiplexing forward channel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200610144919A CN101136719B (en) | 2006-11-22 | 2006-11-22 | Link level simulation method of time division multiplexing forward channel |
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| Publication Number | Publication Date |
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| CN101136719A CN101136719A (en) | 2008-03-05 |
| CN101136719B true CN101136719B (en) | 2012-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200610144919A Expired - Fee Related CN101136719B (en) | 2006-11-22 | 2006-11-22 | Link level simulation method of time division multiplexing forward channel |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1198274A (en) * | 1996-06-27 | 1998-11-04 | Ntt移动通信网株式会社 | Transmitted power controller |
| CN1659797A (en) * | 2002-06-12 | 2005-08-24 | 日本电气株式会社 | CDMA reception device |
-
2006
- 2006-11-22 CN CN200610144919A patent/CN101136719B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1198274A (en) * | 1996-06-27 | 1998-11-04 | Ntt移动通信网株式会社 | Transmitted power controller |
| CN1659797A (en) * | 2002-06-12 | 2005-08-24 | 日本电气株式会社 | CDMA reception device |
Non-Patent Citations (2)
| Title |
|---|
| recommendaded minimum performance standards forcdma2000 high rate packet data access network.3GPP2.2005,(32),全文. * |
| recommendaded minimum performance standards forcdma2000 high rate packet data access terminal.3GPP2.2001,(32),全文. * |
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| CN101136719A (en) | 2008-03-05 |
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