CN1077370C - Random access control for CDMA network - Google Patents
Random access control for CDMA network Download PDFInfo
- Publication number
- CN1077370C CN1077370C CN97115280A CN97115280A CN1077370C CN 1077370 C CN1077370 C CN 1077370C CN 97115280 A CN97115280 A CN 97115280A CN 97115280 A CN97115280 A CN 97115280A CN 1077370 C CN1077370 C CN 1077370C
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- China
- Prior art keywords
- power level
- travelling carriage
- base station
- pulse train
- channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
- H04W60/02—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration by periodical registration
Abstract
To provide a random access control system for reducing the delay of reception at the base station of access burst from each mobile station in a code division multiple access(CDMA) mobile communication network provided with the base station, a plurality of mobile stations, incoming random access channel from the plurality of mobile stations to the base station to be shared among the plurality of mobile stations, and outgoing channel from the base station to the plurality of mobile stations. Each mobile station 1 has received power measuring sections 14 and 13 for measuring the received power of a signal on the outgoing channel as measured power and access burst transmitting sections 12, 11 and 10 for transmitting the access burst to the incoming random access channel with transmission power higher than the measured power when performing access from each mobile station 1 to the incoming random access channel.
Description
The present invention relates to code division multiple access and connect a kind of access control technology at random of using in (CDMA) mobile communication network.
In TIA/EIA (EIA/Telecommunications Industries Association) IS-95A (publication in July nineteen ninety-five), a kind of access control technology at random that is used in the cdma mobile communication network system has been described, for example, in the 6th chapter 108 pages, in Fig. 6 .6.3.1.1.1.-1A (access channel request and response test) and the 6th chapter shown in Fig. 6 .6.3.1.1.1-2 of 110 pages (access procedure enforcement).
In this access control technology at random, access burst pulse train sends by a travelling carriage and realizes that by a up channel it is initial by the transmitted power level that is lower than transmitted power level one fixed amount used in this communication channel open loop.If the base station is to the not response of this access burst pulse train, transmitted power level is after increasing by a specified quantitative in the system, and travelling carriage sends identical access burst of pulses sequence again.When transmitting power increased by a fixed amount, this access burst pulse train was repeatedly sent by travelling carriage, till the response that receives from the base station.
In conventional cdma mobile communication network system as described above, unless reach enough transmitted power levels, otherwise be that the access burst pulse train that can not receive from travelling carriage sends.Therefore, the response of base station is often incured loss through delay, and has reduced the throughput of Random Access Channel and travelling carriage.
The invention provides a kind of code division multiple access and connect (CDMA) mobile communication network, it comprises a base station, and a plurality of travelling carriages, each travelling carriage has and is used for by each travelling carriage to the up channel of each base station communication with by the down channel of this base station to each mobile communications, each travelling carriage has the received power level measure portion of first power level that is used to measure the received signal that receives by down channel, and be used for sending the access burst pulsing part of access burst pulse train by up channel, wherein the transmitted power level of travelling carriage access burst pulse train is higher than first power level of received signal.
According to the present invention, travelling carriage can send access burst pulse train with enough transmitted power levels, causes the base station can easily discern access burst pulse train, thereby improves the throughput of up channel and travelling carriage.
The description of this invention can clearly be familiar with above and other objects of the present invention, feature and good effect in conjunction with the drawings.
Fig. 1 is the block diagram of a kind of CDMA mobile communication systems embodiment of the present invention;
Fig. 2 is the operational flowchart of travelling carriage shown in Figure 1;
Fig. 3 is expression access burst pulse train and the time component that inserts data at random;
Fig. 4 be embodiment illustrated in fig. 1 in the time component of access control at random;
Fig. 5 is the time component from the control channel of base station and data channel.
At first with reference to Fig. 1, a kind of CDMA mobile telecommunication network system of the embodiment of the invention, it comprises a plurality of travelling carriages 10, a plurality of base stations 20 and a single main website 30, only drawn in the drawings a travelling carriage 10 and a base station 20.
In network system, a travelling carriage 10 inserts up channel at random and inserts down channel at random and be connected with a base station 20 at least so that carry out radio communication by one, and wherein base station 20 is connected with the downgoing line distribution by comprising uplink with main website 30.
Travelling carriage 10 comprises an antenna 16, a radiating portion 11, a transmitting power control section 12, a received power measure portion 14, a receiving unit 15, a control section 13 and an interface 17.Radiating portion 11, transmitting power control section 12 and control section 13 form a transmitting block structure, and wherein receiving unit 15 and received power measure portion 14 form one and receive block structure.When additional when LCD or numeric keypad are arranged on the travelling carriage 10, interface 17 is as people's one machine interface.If when travelling carriage 10 had personal computer, interface 17 was as the exterior terminal interface.
Received power measure portion 14 receives from 20 cycles of base station or the interrupted signal that sends by down channel, antenna 16 and receiving unit 15, and determines the power level of this received signal.Therefore the power level of this measurement is fed to transmitting power control section 12, and transmitting power control section 12 is according to the transmitted power level of the received signal power level control access burst pulse train of measuring.
Be in operation, during the idle condition of travelling carriage, promptly when in the calling of waiting for from other travelling carriage, travelling carriage 10 is received from the signal that base station 20 sends by down channel, and measures the transmitted power level of the signal that receives by down channel.When needs one travelling carriage (first travelling carriage) 10 carries out another travelling carriage (second travelling carriage) is sent when calling out, first travelling carriage 10 is selected a launching electrical level, and this launching electrical level exceeds a fixed amount specific in communications network system than the power level of measuring.Therefore, the probability that base station 20 can be discerned from the calling of first travelling carriage 10 increases, thereby has obtained stable communication, and has shortened the time span of waiting for base station in response.
On the other hand, this fixed amount can use a value that increases along with the power level increase of measuring to substitute.In this case, when two travelling carriages 10 produce access burst pulse train to a base station simultaneously, from more being received by base station 20 than another in two travelling carriages 10 near the signal of a travelling carriage 10 of base station 20.
When first travelling carriage 10 produced a calling, this first travelling carriage was linked into and inserts up channel at random.This access burst pulse train transmitting block that comprises control section 13, transmitted power level control section 12 and radiating portion 11 at first sends an access burst pulse train, and this burst sequence only comprises the information that is used to discern first travelling carriage.
20 pairs of these access burst Sequence Response in base station and definite power level have been received, as this field is common by down channel transmission data from the access burst pulse train of first travelling carriage 10.Then, first travelling carriage 10 sends with the power level of being determined by base station 20 that is lower than access burst pulse train transmitted power level by up channel and inserts data at random, this inserts data at random and comprises that telephone number with called second travelling carriage, this number are that identification second travelling carriage is essential.
In this mode, by data volume being limited in the minimum data amount of the necessity that is enough to discern first travelling carriage in needing the access burst pulse train of high transmit power level, the power consumption of travelling carriage is lowered.After by identification of base stations, first travelling carriage sends remaining data with a suitable power level as inserting data at random to the base station.
Fig. 2 shows the operating process of travelling carriage shown in Figure 1.At first, be in idle condition at step S100 travelling carriage, the receiving unit of first travelling carriage 10 15 receives by base station 20 periodically or the signal that sends off and on.Then, at step S101, the power level of received power measure portion 14 received signals, and the power level of measuring is fed to control section 13.
In other words, the correction value Pa that is used for the emission of access burst pulse train can be the unidirectional increase function of mean receiving power level Pr, for example, Pa=aPr+b, wherein a and b are positive constants.In this situation, Ptx=(1+a) Pr+c sets up, and wherein c is the positive constant that is obtained by c=Po+b.
If 10 pairs of base stations of first travelling carriage send an access burst pulse train of calling out second travelling carriage, at step S104, the control section 13 of first travelling carriage 10 determines to be used for the calculated value of that time of transmitted power level Ptxo in emission control part 12 so.At step S105, radiating portion 11 is by inserting up channel at random with transmitted power level Ptxo, sends the access burst pulse train that comprises the data that are used to discern first travelling carriage.
Received from first determining the power level of access burst pulse train and to this access burst Sequence Response in the base station 20 of the access burst pulse train of first travelling carriage 10, with according to the received power level indication of access burst pulse train power level from the data transmission of first travelling carriage 10.Designation data is emitted to first travelling carriage 10 by down channel.At step S106 and S107 according to response from base station 20, the reception piece that comprises receiving unit 15, received power measure portion 14 and control section 13 of travelling carriage 10 is determined a data transmission power level according to the power level of indicating from base station 20, and provides the data transmission power level to transmitting power control section 12.If in the time period that one determines, do not receive response from the base station at step S106, for this purpose, first travelling carriage 10 105 sends identical access burst pulse train set by step again with the transmitted power level Ptx1 based on the next mean receiving power level that upgrades or substitute so.
Step S108 behind step S107, radiating portion 11 send the access data of the remainder that comprises the telephone number of calling out the second travelling carriage needs etc. by the up channel that is used for inserting at random.At step S109, whether all that detect identification second travelling carriage and need at radiating portion 11 insert data at random and are sent out by first travelling carriage.Owing to have remaining data at step S109, processing procedure turns back to step S106 to repeat top step S106 to S108, and remaining data are sent to second travelling carriage by base station 20 by first travelling carriage.If determine that at step S109 all data have all sent, processing procedure turns back to step S100 so, so that begin processing procedure more than the repetition receiving another idle condition from base station signal.
Fig. 3 shows an example of the transmitted power level that adopts in the travelling carriage of present embodiment.For example, the power level that is used for access burst pulse train transmission is higher than and is used for transmission power level one fixed amount that remaining access inserts data at random.
With reference to Fig. 4, base station 20 sends Frame by down channel, and each frame comprises a control channel (affix channel) and is connected to this control channel data channel afterwards.Data channel comprises user's voice data and the out of Memory that gives first travelling carriage 10.Control data comprises the data that are used for Control Network system wireless electric line.
As previously described, travelling carriage 10 at first sends identification first travelling carriage, 10 required minimum data so that determine transmitted power level, as an access burst pulse train, send the remaining data of the second travelling carriage telephone number that comprises that identification second travelling carriage is required then by up channel, as inserting data at random.In this processing procedure, first travelling carriage 10 by up channel with from the downlink frame synchronized transmission access burst pulse train of base station 20 with insert data at random, wherein the transmission of the transmission of access burst pulse train and control channel is finished jointly, should be taken into account data by control channel significantly than little, and can send once more by the information data of data channel transmission.
Get back to Fig. 1, base station 20 comprises an antenna 24, an emission/receiving unit 22, an interference level measure portion 21 and distributes control section 23 launch time.See Fig. 5 again, interference level measure portion 21 is measured the power level of interference waves and will be interfered power level to be sent to control section 23 launch time.Launch time, control section 23 detected the variation of received power level in the frame, the measurement power level of average several frames, and obtain the transit time of interference wave.
The time of adjusting to interference wave launch time of distributing two frames that comprise control channel and data channel that control section 23 will send by down channel launch time.In this case, the interference wave time distributes determine to provide between the base station synchronously be confirmable because the time that interference wave changes distributes.
In the above embodiments, because the transmission of access burst pulse train has enough power levels.So the delay of being confirmed by the access burst pulse train of down channel transmission by the base station can be shortened, owing to can discern access burst pulse train easily from travelling carriage, so also can improve the throughput of Random Access Channel.
Because top embodiment only describes as an example, the present invention is not limited by top embodiment, and some modifications that those skilled in the art make or change do not break away from protection scope of the present invention yet.
Claims (7)
1. a code division multiple access connects mobile communication network, it comprises: a base station, and a plurality of travelling carriages, each travelling carriage has by each described travelling carriage to the up channel of described base station communication with by the down channel of described base station to each described mobile communications, each described travelling carriage has the received power level measure portion of first power level that is used to measure the received signal that receives by described down channel, and be used for sending the access burst pulse train radiating portion of access burst pulse train by described up channel, it is characterized in that the transmitted power level of travelling carriage access burst pulse train is higher than first power level of received signal.
2. code division multiple access according to claim 1 connects mobile communication network, it is characterized in that described transmitted power level be described first power level and fixedly value with.
3. code division multiple access according to claim 1 connects mobile communication network, it is characterized in that described transmitted power level be described first power level and one first value that increases with the increase of described first power level and.
4. code division multiple access according to claim 3 connects mobile communication network, it is characterized in that described first value is along with the increase of described first power level increases linearly.
5. code division multiple access according to claim 1 connects mobile communication network, it is characterized in that described access burst pulse train comprises the information that is used to discern first travelling carriage.
6. code division multiple access according to claim 5 connects mobile communication network, it is characterized in that, after the described access burst pulse train of identification, one second power level is determined for inserting data at random from described each travelling carriage transmission in described base station, and described second power level is lower than the described transmitted power level that is used for described access burst pulse train.
7. code division multiple access according to claim 6 connects mobile communication network, it is characterized in that the described data that insert at random comprise the telephone number of quilt by another travelling carriage of described each travelling carriage calling.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP228836/1996 | 1996-08-29 | ||
| JP8228836A JP2959624B2 (en) | 1996-08-29 | 1996-08-29 | Random access control method |
| JP228836/96 | 1996-08-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1175829A CN1175829A (en) | 1998-03-11 |
| CN1077370C true CN1077370C (en) | 2002-01-02 |
Family
ID=16882627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97115280A Expired - Fee Related CN1077370C (en) | 1996-08-29 | 1997-08-29 | Random access control for CDMA network |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2959624B2 (en) |
| CN (1) | CN1077370C (en) |
| SE (1) | SE9703101L (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3031341B2 (en) * | 1998-07-28 | 2000-04-10 | 日本電気株式会社 | Receiver for random access channel |
| KR100429540B1 (en) * | 1998-08-26 | 2004-08-09 | 삼성전자주식회사 | Packet data communication apparatus and method of mobile communication system |
| GB9910449D0 (en) * | 1999-05-07 | 1999-07-07 | Koninkl Philips Electronics Nv | Radio communication system |
| KR100336033B1 (en) * | 1999-07-21 | 2002-05-08 | 박종섭 | Method for controlling access of a mobile communication mobile station |
| CN1322681C (en) | 2000-02-23 | 2007-06-20 | Ipr特许公司 | Reverse link initial power setting |
| JP2003046437A (en) * | 2001-07-31 | 2003-02-14 | Ntt Docomo Inc | Mobile communication system, base station device, and control method for the mobile communication system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5265119A (en) * | 1989-11-07 | 1993-11-23 | Qualcomm Incorporated | Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system |
| EP0668664A1 (en) * | 1994-01-31 | 1995-08-23 | Matsushita Electric Industrial Co., Ltd. | CDMA/TDD radio communication system |
| EP0671821A2 (en) * | 1994-03-10 | 1995-09-13 | Oki Electric Industry Co., Ltd. | CDMA system using a spreading code divided into quadrature components and interference cancellation by substracting respread data from received signal |
| US5485486A (en) * | 1989-11-07 | 1996-01-16 | Qualcomm Incorporated | Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system |
-
1996
- 1996-08-29 JP JP8228836A patent/JP2959624B2/en not_active Expired - Fee Related
-
1997
- 1997-08-28 SE SE9703101A patent/SE9703101L/en not_active Application Discontinuation
- 1997-08-29 CN CN97115280A patent/CN1077370C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5265119A (en) * | 1989-11-07 | 1993-11-23 | Qualcomm Incorporated | Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system |
| US5485486A (en) * | 1989-11-07 | 1996-01-16 | Qualcomm Incorporated | Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system |
| EP0668664A1 (en) * | 1994-01-31 | 1995-08-23 | Matsushita Electric Industrial Co., Ltd. | CDMA/TDD radio communication system |
| EP0671821A2 (en) * | 1994-03-10 | 1995-09-13 | Oki Electric Industry Co., Ltd. | CDMA system using a spreading code divided into quadrature components and interference cancellation by substracting respread data from received signal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1175829A (en) | 1998-03-11 |
| JP2959624B2 (en) | 1999-10-06 |
| SE9703101L (en) | 1998-03-01 |
| JPH1075210A (en) | 1998-03-17 |
| SE9703101D0 (en) | 1997-08-28 |
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Granted publication date: 20020102 Termination date: 20100829 |