CN1300138A - Method for base station to guide mobile station to reduce prefix emitted power - Google Patents

Method for base station to guide mobile station to reduce prefix emitted power Download PDF

Info

Publication number
CN1300138A
CN1300138A CN99124245A CN99124245A CN1300138A CN 1300138 A CN1300138 A CN 1300138A CN 99124245 A CN99124245 A CN 99124245A CN 99124245 A CN99124245 A CN 99124245A CN 1300138 A CN1300138 A CN 1300138A
Authority
CN
China
Prior art keywords
prefix
travelling carriage
catching
power
base station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN99124245A
Other languages
Chinese (zh)
Other versions
CN1146147C (en
Inventor
王育红
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CNB991242459A priority Critical patent/CN1146147C/en
Priority to PCT/CN2000/000204 priority patent/WO2001045436A1/en
Priority to AU61457/00A priority patent/AU6145700A/en
Publication of CN1300138A publication Critical patent/CN1300138A/en
Application granted granted Critical
Publication of CN1146147C publication Critical patent/CN1146147C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
    • H04W52/58—Format of the TPC bits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention provides a method using base station to utilize acquisition indicating channel to send information to indicate mobile station to reduce prefix emission power. The acquisition indicating information is comprised of acquisition indication (AI) portion for indicating mobile station to send information or continuously send prefix and powder adjustment (PA) portion for indicating mobile station to reduce prefix emission power value. When the acquisition indication sent by base station is received by mobile station, and is 1. Said mobile station must continuously demodurate PA portion so as to obtain emisson power reduced valve when the next prefix is sent by mobile station.

Description

A kind of method by base station indication mobile station to reduce prefix transmitting power
The present invention relates to code division multiple access (CDMA) communication system, say more in detail, the present invention relates to the base station by (acquisition indication channel AICH) goes up the method that the information that sends is indicated the mobile station to reduce prefix transmitting power at AICH Acquisition Indication Channel.
In asynchronous CDMA communication system, travelling carriage at first by Cell searching set up with the sub-district synchronously, then at Reverse Access Channel (reverse access channel, RACH) go up transmission prefix (preamble), and the base station sends indication (acquisition indication, AI) information of catching on AICH Acquisition Indication Channel.Its process is roughly as follows.
(broadcast channel reads the information of relevant this sub-district on BCCH) to travelling carriage at the broadcast channel of sub-district.Described information comprises: the scrambler of the spreading code/message part (message) of the prefix part that use (1) this sub-district; (2) available mark (signature); (3) every kind of access service classification (access service category, the groups of subchannels of Reverse Access Channel ASC) (RACH); (4) spreading factor that can use of message part; (5) interference level of the up link in this sub-district; (6) main shared control channel (common control principalchannel, CCPCH); (7) transmit timing of AICH Acquisition Indication Channel; (8) the power deviation Δ P of prefix part and message part P-mAnd (9) power excursion Δ P0 (when not receiving the power recruitment of catching when indication) and Δ P 1(when receiving the power reduction amount of catching when being designated as-1).
Travelling carriage is at first selected a prefix spreading code randomly from available spreading code after reading cell information, and be set to P according to the transmitting power of open loop power estimated value prefix RACHTravelling carriage is then carried out the random back algorithm selecting a RACH subchannel from available ASC groups of subchannels, thus in the RACH subchannel of selecting, obtain in two frames down access slot (access slot, AS).Travelling carriage is selected a mark more randomly from available mark.Travelling carriage adopts the mark of selecting at last at the up access slot that obtains, and sends prefix with the prefix transmitting power that is provided with.
Indication will caught by the transmission of AICH channel with the corresponding descending access slot of up access slot in the base station.If travelling carriage does not receive at this descending access slot and catches indication, then it will select a new up link access slot, and its prefix transmitting power is increased Δ P 0If travelling carriage is designated as-1 catching of receiving of this descending access slot, then it will select a new up link access slot, and its prefix transmitting power is reduced Δ P 1If travelling carriage is designated as catching of receiving of this descending access slot+and 1, then it will send message after sending 3 or 4 time slots of last prefix.The transmitting power of message part will be adjusted Δ P with respect to the power of last prefix that sends P-m
Fig. 1 shows 3G (Third Generation) Moblie standardization body (Third Generation Partnership Project, 3GPP) pattern of catching indication information of Gui Ding AICH frame.The length of two AICH frames is 20ms, comprises 15 access slots, includes the indication information of catching to a travelling carriage in each time slot.Catch indication information and be included in catching indicating section (AI-part) and being connected on thereafter empty part (empty-part) of front.The former length is 16 code elements (4096 chips), and latter's length is 4 code elements (1024 chips).
Fig. 2 illustrates the production method of catching indication information of 3GPP regulation.Among the figure, W i(i=1,2 ..., 16) and be the code word of 16 quadratures, AI i(i=1,2 ..., 16) and be 16 and catch indication that constitute the AI part by 16 code elements of beginning, it is 16 code word W i(i=1,2 ..., 16) multiply by and catch indication AI accordingly i(i=1,2 ..., 16) and the corresponding code element sum in back, and last 4 zero symbols constitute empty part.
In the prior art, travelling carriage adopts the open Loop Power control mode to send initial prefix, promptly, travelling carriage estimates the path loss of up link according to the BCCH transmitting power of BCCH channel radio, and it determines the transmitting power of up prefix again according to the interference level of the up link of broadcasting on the BCCH channel.Yet when the frequency of the radio-frequency carrier of up link and down link differed big, the error that this open loop power is estimated was bigger, thereby made the initial open loop power of travelling carriage estimate to require the power difference that receives bigger with the base station.Like this, travelling carriage receive negative catch indication after, in new ascending time slot, resend prefix, its transmitting power is than the preceding power reduction Δ P that once sends prefix 1Too high when the mobile station's initial transmit estimated value, when requiring the performance number of reception to differ big with the base station, the transmitting power that general travelling carriage need repeatedly reduce prefix just can reach desired value.In other words, travelling carriage often will could send message after having sent several prefixes.This has not only reduced access efficiency, has wasted system resource, has increased the interference to system, has also reduced the capacity of system.
The objective of the invention is to overcome that travelling carriage need repeatedly reduce the shortcoming that transmitting power just can reach desired value in the prior art, thereby under the situation that does not increase system resource, travelling carriage needn't repeatedly send prefix can send message.
The present invention provides a kind of method that is sent capturing information indication mobile station to reduce prefix transmitting power by the base station by the AICH channel.Adopt method of the present invention, travelling carriage is at first set the prefix transmission power level according to the cell information that receives, and the up access slot that obtains on Reverse Access Channel, adopts the mark of selecting, and sends prefix with the performance number of setting; Secondly travelling carriage receives the indication information of catching for this travelling carriage that the base station sends through AICH Acquisition Indication Channel in the descending access slot corresponding with up access slot, last travelling carriage is made different responses according to different situations, wherein, catch indication information by be used to indicate travelling carriage to send message or continue to send prefix catch indicating section and be connected to thereafter the power adjustments that is used to indicate the mobile station to reduce prefix transmission power level that (power adjustment, PA) part constitutes.
Below, will introduce method of the present invention in conjunction with the accompanying drawings in detail.In these accompanying drawings:
Fig. 1 illustrates the pattern of catching indication information of 3GPP regulation;
Fig. 2 illustrates the production method of catching indication information of 3GPP regulation;
Fig. 3 is the pattern of catching indication information that the present invention proposes;
Fig. 4 is first kind of coding method of the power adjustments signal that proposes of the present invention;
Fig. 5 is second kind of coding method of the power adjustments signal that proposes of the present invention;
Fig. 6 is an example of catching the pattern of indication information of the present invention;
Fig. 7 is the example of first kind of coding method of power adjustments signal of the present invention; And
Fig. 8 is the example of second kind of coding method of power adjustments signal of the present invention.
Referring now to Fig. 3,, the figure shows the pattern of catching indication information that the present invention proposes.As seen from Figure 3, indicating frame through catching of AICH channel transmission is two frames, and length is T (ms), comprises L access slot.The indication information of catching in each access slot comprises and catches indication (AI) part and power adjustments (PA) part.The length of AI part is M 1Individual chip comprises N 1Individual code element.Here, N 1Be the length of the mark that adopts of travelling carriage, it is 2 integral number power.The spreading factor of AI part is M 1/ N 1AI is N 1The code word W of individual quadrature i(i=1,2 ..., N 1) multiply by and catch indication AI accordingly iThe code element sum that the back is corresponding.The length of PA part is M 2Individual chip, power adjustments (PA) information that is used to carry 2 bits.When the base station thinks that the prefix transmitting power of certain travelling carriage is too high, just at the descending time slot of correspondence earlier with the M of AI part 1Individual chip sends catches indication-1, again with the M that is connected to PA part thereafter 2Individual chip indicate this travelling carriage when subsequently prefix of emission transmitting power reduce value.Enumerate two kinds of schemes and corresponding example thereof below.(scheme 1)
As shown in Figure 4, the M of PA part 2Individual chip comprises 2N 1Individual code element, the spreading factor SF=M of each code element 2/ 2/N 1This 2N 1Individual code element is that length is N 1The code word W of individual code element i(W I1, W I2..., W IN1) twice repetition.Code word W iPartly has Ai with AI i=-1 orthogonal code unanimity.At this moment, can be at this 2N 1The power control information of modulation 2 bits on the individual code element.That is, if the W of AI part i(W Il, W I2..., W IN1) corresponding catching is designated as-1, is M at total length then 2Two code word W of individual chip iW iThe modulation power that is 2 bits is regulated indicatrix b 0b 1If this amount is respectively 00,01,10 and 11, then travelling carriage reduces Δ P respectively with the transmitting power of next prefix 1, 2 Δ P 1, 3 Δ P 1With 4 Δ P 1For travelling carriage, catch accordingly and be designated as-1 if its AI of demodulation partly obtains it, then it also need continue the M of the PA part of demodulation back 2Individual chip is to obtain PA information.(scheme 2)
As shown in Figure 5, the total length of PA part is M 2Individual chip.M with beginning 2/ 2 chips are modulated first code element b 0, it is N that its spreading code adopts length 1The M of the mark of individual chip 2/ 2/N 1Inferior repetition.With M thereafter 2Second code element b of/2 chip modulation 1, it is N that its spreading code adopts length 1The M of the mark of individual chip 2/ 2/N 1Inferior repetition.Here, the mark of the corresponding travelling carriage that receives of the mark that adopts of base station and base station is identical.If the W of AI part i(W I1, W I2..., W IN1) corresponding catching is designated as-1, is M with total length then 2Individual chip modulation power is regulated indicatrix b 0b 1If this indicatrix is respectively 00,01,10 and 11, then travelling carriage will reduce Δ P to transmitting power respectively when sending next prefix 1, 2 Δ P 1, 3 Δ P 1With 4 Δ P 1For travelling carriage, if partly obtaining catching, its AI of demodulation is designated as-1, then it also need continue the M of the PA part of demodulation back 2Individual chip is to obtain PA information.
Provide example of the present invention below.As shown in Figure 6, take and the identical parameter of 3GPP regulation for AICH frame, time slot etc., promptly, the AICH frame is two frames, and 20ms has 15 access slots in two frames altogether, the AI of each access slot partly is 16 code elements, totally 4096 chips, and PA partly is 1024 chips.AI partly is the code word W of 16 quadratures i(i=1,2 ..., 16) multiply by and catch indication AI accordingly iThe back corresponding code element and, the spreading factor of AI signal is 256.What the mark that certain travelling carriage is sent when the base station returned catches when being designated as-1, retransmit the number of times of prefix in order to reduce travelling carriage, base station usefulness is connected on 1024 chips of the PA signal behind the AI signal and indicates this travelling carriage when launching prefix part subsequently how many transmitting powers to be reduced.The corresponding example of narration and above-mentioned scheme 1 and scheme 2 respectively below.(example 1)
As shown in Figure 7, corresponding 32 code elements of 1024 chips of PA signal are so its spreading factor is 32.These 32 code elements are that length is the code word W of 16 code elements i(W I1, W I2..., W I16) twice repetition.This code word and AI signal have an Ai i=-1 orthogonal code is consistent.At this moment, can on these 32 code elements, modulate the power adjustments indicatrix b of 2 bits 0b 1If this indicatrix is respectively 00,01,10 and 11, then travelling carriage will reduce Δ P to transmitting power respectively when sending next prefix 1, 2 Δ P 1, 3 Δ P 1With 4 Δ P 1For travelling carriage, catch accordingly and be designated as-1 if 16 code elements of its AI of demodulation part obtain it, then it also need continue 1024 chips that demodulation is connected on the PA part of its back, to obtain power adjustments information.(example 2)
As shown in Figure 8, modulate 2 code element b with 1024 chips of PA part 0b 1, that is, modulate first code element b with preceding 512 chips 0, with second code element b of back 512 chips modulation 1It is 32 repetitions of the mark of 16 chips that its spreading code adopts length.Here, the mark of the corresponding travelling carriage transmission that receives of the mark that adopts of base station and base station is identical.If the W of AI part i(i=1,2 ..., 16) and corresponding catching be designated as-1, and then in 1024 chips of PA part, modulation power is regulated indicatrix b 0b 1If this indicatrix is respectively 00,01,10 and 11, then travelling carriage will reduce Δ P to transmitting power respectively when sending next prefix 1, 2 Δ P 1, 3 Δ P 1With 4 Δ P 1For travelling carriage, catch accordingly and be designated as-1 if 16 code elements of its AI of demodulation part obtain it, then it also need continue 1024 chips that demodulation is connected on the PA part of its back, to obtain power adjustments information.

Claims (5)

1. one kind is sent by AICH Acquisition Indication Channel by the base station and to catch the method that indication information indication travelling carriage reduces transmitting power, and described method comprises the steps:
Described travelling carriage is set the prefix transmission power level according to the cell information that receives, and the up access slot that obtains on Reverse Access Channel, adopts the mark of selecting, and sends prefix with the described prefix transmission power level of setting;
Described travelling carriage receives the described indication information of catching to described travelling carriage that described base station sends through described AICH Acquisition Indication Channel in the descending access slot corresponding with described up access slot; And
Described travelling carriage is describedly caught the different situations that indication information runs into and is made different responses according to receiving, described method is characterised in that, travelling carriage responds catches indicating section and be right after in being used to thereafter and indicate the power adjustments of mobile station to reduce prefix transmission power level partly to constitute by being used to indicate to catch indication information.
2. the method for claim 1, the different response that described travelling carriage is made is meant:
When described travelling carriage does not receive describedly when catching indication information, then it will increase Δ P to described prefix transmitting power when the described up access slot of the next one sends described prefix 0
When described travelling carriage receive described catch catching of indicating section correspondence be designated as+1 the time, then it will send message behind several described up access slots;
Describedly catch catching of indicating section correspondence when being designated as-1 when what described travelling carriage received, then it will reduce described prefix transmitting power when the described ascending time slot of the next one sends described prefix, it is characterized in that the reducing to be worth by described described power adjustments of catching indication information of described prefix transmitting power partly pointed out.
3. the method for claim 1 is characterized in that, the described indicating section of catching is total up to M 1Individual chip comprises N 1Individual code element, described power adjustments partly is total up to M 2Individual chip comprises 2N 1Individual code element, described 2N 1Individual code element is that length is N 1The code word W of individual code element i(W I1, W I2..., W IN1) twice repetition, described code word and the described indicating section of catching have AI i=-1 orthogonal code unanimity is when described described code word W of catching indicating section i(W I1... W I2..., W IN1) corresponding catching be designated as at-1 o'clock, then at the described M of described power adjustments part 2The power adjustments indicatrix b of modulation 2 bits in the individual chip 0b 1
4. the method for claim 1 is characterized in that, the described indicating section of catching is total up to M 1Individual chip comprises N 1Individual code element, described power adjustments partly is total up to M 2Individual chip is used preceding M 2/ 2 chips are modulated first code element b 0, with back M 2Second code element b of/2 chip modulation 1, it is N that spreading code all adopts length 1The M of the mark of individual chip 2/ 2/N 1The described mark that inferior repetition, described base station are here adopted is identical with the mark of the travelling carriage that described base station receives, when described code word W of catching indicating section i(W I1, W I2..., W IN1) corresponding described catching be designated as at-1 o'clock, then at the described M of described power adjustments part 2The power adjustments indicatrix b of modulation 2 bits in the individual chip 0b 1
5. as claim 3 or 4 described methods, it is characterized in that, as described power adjustments indicatrix b 0b 1Be respectively 00,01,10 and at 11 o'clock, then described travelling carriage reduces Δ P to the transmitting power of described next prefix respectively 1, 2 Δ P 1, 3 Δ P 1With 4 Δ P 1
CNB991242459A 1999-12-13 1999-12-13 Method for base station to guide mobile station to reduce prefix emitted power Expired - Fee Related CN1146147C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CNB991242459A CN1146147C (en) 1999-12-13 1999-12-13 Method for base station to guide mobile station to reduce prefix emitted power
PCT/CN2000/000204 WO2001045436A1 (en) 1999-12-13 2000-07-17 A method of indicating a mobile station by a base station to reduce preamble transmission power
AU61457/00A AU6145700A (en) 1999-12-13 2000-07-17 A method of indicating a mobile station by a base station to reduce preamble transmission power

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB991242459A CN1146147C (en) 1999-12-13 1999-12-13 Method for base station to guide mobile station to reduce prefix emitted power

Publications (2)

Publication Number Publication Date
CN1300138A true CN1300138A (en) 2001-06-20
CN1146147C CN1146147C (en) 2004-04-14

Family

ID=5283329

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB991242459A Expired - Fee Related CN1146147C (en) 1999-12-13 1999-12-13 Method for base station to guide mobile station to reduce prefix emitted power

Country Status (3)

Country Link
CN (1) CN1146147C (en)
AU (1) AU6145700A (en)
WO (1) WO2001045436A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100344194C (en) * 2003-12-15 2007-10-17 华为技术有限公司 An apparatus and method for correct acquisition of capture indication
CN100393010C (en) * 2001-12-28 2008-06-04 中兴通讯股份有限公司 Base station resolution prefixing method in wide-band code division multi-address system
CN100405867C (en) * 2002-07-09 2008-07-23 沙桥技术有限公司 Method of determining an acquisition indicator bit in a communication system
CN103889060A (en) * 2012-12-20 2014-06-25 财团法人工业技术研究院 Transmission method, receiving method, transmitter and receiver

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI965104A (en) * 1996-12-18 1998-06-19 Nokia Telecommunications Oy A method for improving system capacity in a cellular radio system and a base station
US6275478B1 (en) * 1998-07-10 2001-08-14 Qualcomm Incorporated Methods and apparatuses for fast power control of signals transmitted on a multiple access channel
KR20000014424A (en) * 1998-08-17 2000-03-15 윤종용 Apparatus and method for transmitting preamble of access channel
FI106996B (en) * 1998-08-27 2001-05-15 Nokia Mobile Phones Ltd Method for indicating the use of power in a packet switching data transmission system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100393010C (en) * 2001-12-28 2008-06-04 中兴通讯股份有限公司 Base station resolution prefixing method in wide-band code division multi-address system
CN100405867C (en) * 2002-07-09 2008-07-23 沙桥技术有限公司 Method of determining an acquisition indicator bit in a communication system
CN100344194C (en) * 2003-12-15 2007-10-17 华为技术有限公司 An apparatus and method for correct acquisition of capture indication
CN103889060A (en) * 2012-12-20 2014-06-25 财团法人工业技术研究院 Transmission method, receiving method, transmitter and receiver
CN103889060B (en) * 2012-12-20 2018-04-27 财团法人工业技术研究院 Transmission method, method of reseptance, conveyer and receiver

Also Published As

Publication number Publication date
WO2001045436A1 (en) 2001-06-21
AU6145700A (en) 2001-06-25
CN1146147C (en) 2004-04-14

Similar Documents

Publication Publication Date Title
CN100512093C (en) Multi-carrier-wave communication system TSO time-slot resource distribution method and grouped data transmission method
US6333937B1 (en) Access retry method for shared channel wireless communications links
DE69925800T2 (en) METHOD AND DEVICE FOR MAXIMIZING THE REST PERIOD USING A QUICK RUN CHANNEL
DE60034831T2 (en) Method and base station for transmitting information via a common packet data channel
CN1270448C (en) Method and apparatus for link adaptation in a mobile communication system
EP1512240B1 (en) Apparatus and an associated method for facilitating communications in a radio communication system that provides for data communications at multiple data rates
US7672286B2 (en) Reverse-link structure for a multi-carrier communication system
CN1309181C (en) Radio communication system
CN1701558A (en) Method and system for improving the reliability of quality feedback in a wireless communications system
US20020155840A1 (en) Base station device and wireless communication method
CN101513113A (en) Wireless communication system, mobile station apparatus and random access method
CN1886905A (en) Method and apparatus for supporting downlink combined detection in TDD-CDMA communication system
CN101064559A (en) Resource distribution method and system
CN1449139A (en) Method for transmitting high-speed data service based on time-division duplex mode
CN101662345A (en) Sending method and a receiving terminal of control information
CN101087469B (en) A method for realizing random access of user device
CN1320310A (en) Method and radio communication system for synchronizing subscriber stations
CN1184760C (en) Data transmission control method of downgoing high speed shared channel in high speed data insertion system
CN1146147C (en) Method for base station to guide mobile station to reduce prefix emitted power
CN1303845C (en) Radio communication system
CN1582001A (en) Method for high-frequency amplifying station to gain switching point in TD-SCDMA system
CN101431365B (en) Data transmission method of TDD system
CN101039512A (en) Method and apparatus for producing signal of sharing information channel of high speed downlink sharing channel
CN1185808C (en) Synchronization method for base stations
CN1143585C (en) Process and base station for transmitting organisation information in radiocommunication system

Legal Events

Date Code Title Description
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C06 Publication
PB01 Publication
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20040414

Termination date: 20161213