CN1433654A - Method for assigning radio resources - Google Patents
Method for assigning radio resources Download PDFInfo
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- CN1433654A CN1433654A CN00818857.2A CN00818857A CN1433654A CN 1433654 A CN1433654 A CN 1433654A CN 00818857 A CN00818857 A CN 00818857A CN 1433654 A CN1433654 A CN 1433654A
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- ifw
- portable terminal
- different
- noiseless
- sign indicating
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/0055—ZCZ [zero correlation zone]
- H04J13/007—LAS, i.e. LA, LS and LAS codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
- H04J13/22—Allocation of codes with a zero correlation zone
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
This invention describes a method for adapting the radio channel to the radio propagation conditions of different mobile terminal under an IFW wireless system. This is achieved by assigning different interference Free Windows to different mobile terminals. This invention provides a method for supporting one of more IFW within the cell location and thus allowing the air interface to support mobile terminals with different IFW requirements. This invention also describes the IFW selection procedure to be performed during call setup and the IFW handoff procedure that is performed when the network determines that the IFW of the mobile terminal should be changed during a call or a daga session. These two procedures allow the dynamic adaptation of IFW so that the channel can be dynamically adapted to the changing propagation behavior of the mobile terminals.
Description
Technical field
The present invention relates to the method for distributing radio resource in wireless system, particularly have the method and apparatus of distributing radio resource in the wireless system of orthogonal intersection of noiseless window (IFW) characteristic in use.
Background technology
In PCT application PCT/CN00/00028, by Li Daoben, " a kind of spread spectrum multiple access coding method " of invention with zero correlation zone, a kind of encoding scheme of the LS of being called sign indicating number is disclosed, the LS sign indicating number has a specific character, promptly when two copies of LS sign indicating number when n chip window is synchronous, except initial point, the auto-correlation of LS sign indicating number is zero.In addition, the LS sign indicating number has another characteristic, promptly when two sign indicating numbers when same n chip window is synchronous, the cross-correlation of two different LS sign indicating numbers is zero.Therefore, as described at PCT/CN00/00028, having size is the zero correlation zone of n chip.In the context of this invention, with noiseless window of term or IFW alternative terms zero correlation zone.
Therefore, when the signal that remote unit is modulated through one group of LS sign indicating number to the base station transmission, this group LS sign indicating number has the noiseless window of [n ,+n], as long as their arrive reception base station each other in n chip, these signals just do not disturb each other mutually.This has eliminated from intersymbol interference and the multiple access of the multipath signal of same remote unit when signal from different remote units arrives in noiseless window and has disturbed.
Hereinafter, wireless system, signal, the air interface of using the LS sign indicating number to make orthogonal intersection is called the air interface of wireless system, LS encoded signals and the LS coding of LS coding.
Hereinafter, use wireless system, signal, the air interface of orthogonal spreading code to be called IFW wireless system, IFW signal and IFW air interface with IFW characteristic.
Because as the described LS sign indicating number of PCT/CN00/00028 IFW characteristic, arrive any LS encoded signals noiseless existence after specific mobile or stationary transmitter decorrelation of receiver.This is suitable for from the signal of transmitter reflection or from the signal of another transmitter.Like this, disturb (MAI) and intersymbol interference (ISI) minimum in order to make multiple access, and realize best transmission quality, must satisfy two conditions at the wireless system of LS coding:
1) the most of energy that transmits must fall into predetermined time window.This shows that maximum delay expansion (or multipath expansion) must be less than noiseless window.
2) transmission of two portable terminals of use LS sign indicating number must be synchronized with each other in IFW.
Any uplink signal from same or different mobile terminal if the base station does not receive at this window, all can produce MAI and ISI, thereby reduces transmission quality and power system capacity.
Known to us, the present invention comprises first kind of suggestion to the greatest extent, is fit to the radio propagation conditions of the different mobile terminal of the noiseless window new ideas of use.
Summary of the invention
One object of the present invention is that the air interface that provides a kind of LS to encode can adapt to the radio propagation conditions of different mobile terminal, particularly adapts to the method for the time-delay distribution character of this environment.
Another object of the present invention is to provide the method for different mobile terminal in a kind of any wireless system cell of different IFW being distributed to the LS coding.
Other purpose of the present invention is to adjust according to the up-to-date interference characteristic self adaptation of each portable terminal in the sub-district step and the process of IFW.
The present invention relates to the method that a kind of IFW of making air interface adapts to the radio propagation conditions of different mobile terminal in the same sub-district.This at first utilizes the feature of the wireless system of LS coding to realize, wherein gives the IFW of sizing relevant with the LS sign indicating number.Bigger IFW can allow to transmit the signal of bigger time delay expansion.But,, and between the final system capacity restriction is arranged in IFW size, available LS number of codes.IFW is big more, and the number of available LS sign indicating number is more little.Therefore it is favourable IFW being restricted to the minimum value that requires, and so more the LS sign indicating number of big figure is used to transmit customer service.
In wireless communication system, the radio propagation conditions of each portable terminal is along with its position and other factor change and change.This means that the minimum IFW that can realize acceptable energy (for example error rate) changes with user's (or user's group).The invention provides a kind of wireless system at LS coding realize below the method and apparatus of advantage.
● support the different I FW size of the different mobile terminal of same sub-district;
● select the IFW of portable terminal dynamically according to the wireless propagation environment of user's experience;
● the process of selecting and changing best IFW is provided for each portable terminal.
This invention makes different users adapt to IFW dynamically according to the nature of radio propagation that each user measures.Thereby the power system capacity that makes is higher, each customer service better quality.
The present invention is according to a kind of like this viewpoint, and the transmission signals of promptly fixing from of the wireless system of LS coding or mobile transmitter can be by receiver with a plurality of different modes and from the Signal Separation of other transmitter.For example separate and can realize like this:
-in time domain, transmitter is limited in specific time slot emission;
-in spatial domain, utilize adaptive antenna array to distinguish the different delayed time extended area;
-at frequency domain, different RF allocation of carriers is given transmitter with different delayed time characteristic;
-different Code Channels is distributed to the mobile device that belongs to the different delayed time expansion type.
According to the present invention, this method comprises following step:
1. air interface is divided into a plurality of parts of time domain, spatial domain or frequency domain.Each part is supported different IFW.For example, in time domain, can realize by different IFW is distributed to different SF.In spatial domain, can realize by the antenna of different IFW being distributed to different directions.At frequency domain, can realize by different IFW is distributed to different carrier waves.
2. when the mobile terminal request radio channel resource, the IFW assigning process is performed, thereby portable terminal is assigned with Radio Resource, and it supports to be suitable for most the IFW of portable terminal radio propagation conditions.
3. during communications of Mobile Terminals, network is estimated the radio propagation conditions of portable terminal always.If wireless propagation environment changes, make the interference level of portable terminal raise or reduction, portable terminal just is assigned with another Radio Resource with different I FW.This process is called the IFW handoff procedure.
Description of drawings
The description of drawings of this specification specific embodiment of the present invention, and and specification one be used from explanation, but do not limit principle of the present invention.
Fig. 1 represents the LAS-2000 frame structure based on the preferred embodiment of the present invention, and illustrates how this frame is divided into subframe and time slot.
Fig. 2 represents that the LS sign indicating number gives birth to tree and noiseless window is described and the relation of available LS number of codes.
Fig. 3 represents different IFW windows is distributed to the example of SF different in the LAS-2000 frame structure of 20ms, so each 20ms subframe is supported 2 IFW.
Fig. 4 represents different IFW windows is distributed to the example of SF different in the LAS-2000 frame structure of 20ms, so each 20ms subframe is supported 3 IFW.
Fig. 5 represents when receiving the channel resource request of portable terminal, carries out the step of IFW assigning process.
Fig. 6 represents when setting up voice call or data session between portable terminal and network, carries out the step that IFW switches.
Embodiment
According to the design of IFW wireless system, system can be configured to the disturbed condition that allows portable terminal different.In the cellular system based on CDMA, interference may come from many aspects.The main source that disturbs comprises that intersymbol interference (ISI), multiple access disturb (MAI), adjacent area interference (ACI) and noise.The existence of many reflection paths of the same transmission of ISI portable terminal causes.Because the time diffusion property that different reflection paths do not wait, the adjacent-symbol of same transmission overlap each other and cause disturbing.MAI is the interference result between the transmission path of different mobile terminal in the same sub-district.Known and be difficult to design the coding of the fine ISI of overcoming and MAI simultaneously.ACI is because the transmission of the portable terminal of adjacent channel or sub-district produces, and noise to be the source that does not belong to the wireless communication system of being discussed produce.
The IFW wireless system has a characteristic and is then can eliminate ISI and MAI if belong to the noiseless window inter-sync of many transmission paths of identical or different mobile radio station at a given n chip.In the present invention, the method that provides a kind of IFW of making to adapt to portable terminal ISI and MAI condition can realize best ISI and MAI characteristic thus, and needn't the total capacity of reduction IFW wireless system.
Fig. 1 has described LAS-2000 (big area synchronized) frame structure according to the preferred embodiment of the invention, and represents how this frame is further divided into subframe and time slot.LAS-2000 is a kind of mode of operation with the IFW wireless system of IS-2000 compatibility.The mode of operation that also has other is for example with broadband-LAS (W-LAS) in the wideband CDMA compatibility of UMTS standard definition.Following specification is based on the LAS-2000 statement.But application of the present invention is not limited to LAS-2000.It can be used for W-LAS and other IFW wireless system mode of operation.LAS-2000 frame length 20ms, and be divided into 10 subframes (SF).Each 20ms frame comprises 24576 chips.First SF comprises 1545 chips and is used to deliver the broadcasting of forward link and the synchronizing channel of synchronizing channel and reverse link.Remaining 9 SF, each comprises 2559 chips, is used to carry customer service and other signaling channel, for example Common Control Channel and pilot channel.
Each SF is divided into 17 time slots (TSs).TSO is mainly used in the carrying pilot channel, and it also can be used for other purpose.TS1 to 16 is used to deliver customer service and signaling information.The concrete original position of TS is subjected to the control of the LA sign indicating number that uses in the SF.
At the artificial Li Daoben of invention, denomination of invention is among the PCT application PCT/CN98/00151 of " a kind of spread spectrum multiple access coding method ", discloses the LA sign indicating number.The present invention utilizes the described LA sign indicating number of PCT/CN98/00151, and each SF has (136,17, a 2259) LA sign indicating number.This LA sign indicating number comprises 17 pulses with 2559 chip period.Each LA pulse is corresponding to the time slot in the SF.First time slot can be used as pilot tone as previously mentioned, and remaining 16 time slots can be used for delivering user data or signaling information.LS sign indicating number of each TS delivery, the LS sign indicating number is divided into C and S two parts, and each 64 chip is long.The space that two 4 chips are arranged in the LS sign indicating number, one is positioned at before the C composition, and another is between C and S composition.
Fig. 2 represents LS sign indicating number generation tree.At the root of tree, pair of L S sign indicating number is arranged as can be seen, be called ancestors.When the downward one deck of tree, the length doubles of the number of LS sign indicating number and LS sign indicating number.When the length of root was 2, it was 128 chips, 128 LS sign indicating numbers of (C and S composition are together) that the bottom of tree comprises length.The minimum IFW of tree and subtree depends on the selection in whole tree.If all LS sign indicating numbers all can be used for carrier wave, the IFW size equals 1 chip or [0,0].When only using half of 128 LS sign indicating numbers, for example when LS sign indicating number 1-64 or LS sign indicating number 65-128, the minimum length of IFW is increased to 3 chips or [1 ,+1].Similarly, if only use 1/4th of 128 LS sign indicating numbers, LS sign indicating number 1-32,33-64,65-96 or 97-128, the size of IFW is increased to 7 chips or [3 ,+3] so.Therefore, there is restriction relation between the IFW and between the available LS number of codes.
The invention provides a kind of according to each moves or stationary transmitter is measured the adaptive method that finds one group of available LS sign indicating number of time delay expansion.The present invention relies on the multipath transmission characteristic of mobile device and separates them.A kind of implementation is at first SF to be divided into two groups to organize in time domain more, wherein every group relevant with an IFW, then according to the radio propagation conditions of portable terminal experience will be not on the same group SF distribute to different portable terminals.Described as following preferred embodiment.
In a preferred embodiment of the invention, each 20ms frame delivers two voice channels of each LS sign indicating number.Preceding four SF are used to deliver a voice channel, and back four SF are used to carry another voice channel, and SF9 is used for signaling or other purpose.Different IFW might be distributed to two channels of 20ms frame then.In the case, SF1 to 4 can distribute the IFW of 1 chip that is 128 LS sign indicating numbers to the maximum, is used to deliver voice service, and SF5 to 8 can distribute the IFW of 3 chips that are 64 LS sign indicating numbers to the maximum, is used to deliver voice service.As shown in Figure 3.
In an alternative embodiment of the invention shown in Figure 4, the LAS-2000 frame of 20ms is divided into 3 Frames (DF), DF1, DF2 and DF3.Each DF comprises 3 SF.In this case, the IFW of different sizes can distribute to different DF.For example, DF1 can distribute the IFW of 1 chip, and DF2 can distribute the IFW of 3 chips, and DF5 can distribute the IFW of 7 chips.When allocation of channel resources may, portable terminal distributes DF according to radio propagation conditions.Be in good wireless propagation environment, promptly the very little portable terminal of time delay expansion between many reflection paths can distribute DF1.On the other hand, the portable terminal of the high time delay expansion of experience can distribute DF2 or DF3 on reflection path.
Notice that the IFW size also is subjected to the influence of other design parameter, for example space between C and the S composition in the LS sign indicating number.Here the IFW size of mentioning is the maximum available size of given available LS number of codes.Fig. 3 and 4 have represented two certain embodiments of the present invention.Other arrangement, for example the IFW with different sizes distribute to each SF or support that the IFW more than 3 also is possible in the 20ms frame, and are not included in the example that Fig. 3 and 4 provides.
The method that it should be noted that other can be used for dividing not portable terminal on the same group, and these portable terminals show different propagation characteristics so that realize the present invention that this patent covers.This method comprises the use adaptive antenna array, utilizes the multipath characteristics of measuring to separate the mobile device that presents different multipath characteristics.Because the signal from transmitter can separate with these antenna, they do not disturb the emission unit that belongs to different multipath characteristics.One group of mobile device with consistent time-delay characteristics can use minimum IFW according to the time delay expansion of this group transmitter.
Other method relates to the application that dynamic assignment is given the different RF carrier wave belong to similar multipath characteristic group, or uses orthogonal code to create different emission units, the IFW of its available the best and do not have and be subjected to the risk that wideer time delay expansion mobile radio station disturbs.
The wireless propagation environment that makes IFW adapt to each portable terminal can be realized by two other processes: IFW distributes and the IFW handoff procedure.During connecting foundation and resource allocation, carry out the IFW assigning process.Estimate the initial radio propagation conditions of portable terminal, mobile device is assigned with the resource of specific SF, transmitter or carrier wave (relying on specific execution mode) then, and it has the IFW that is suitable for the portable terminal propagation conditions most.When changing, carries out the wireless propagation environment of portable terminal the IFW handoff procedure during communication session.Cause the multipath delay expansion to increase if be worse off, then portable terminal can switch to SF, transmitter or the carrier wave with bigger IFW.On the other hand, lower if improvement of terms makes less IFW be enough to make portable terminal to disturb, then portable terminal can switch to SF, transmitter or the carrier wave with littler IFW.In this way, only just bigger IFW is distributed to portable terminal where necessary.So just can better utilize radio channel resource.The preferred embodiment of following more detailed description IFW distribution and IFW handoff procedure.
Fig. 5 represents the flow chart of IFW assigning process.The IFW assigning process comprises three steps: resource request, IFW decision-making and resource allocation.Step of resource request is from the request of network reception from the portable terminal of Radio Resource.It can be the voice channel request message that the user is produced by mobile device when making a call, or user's Packet Data Channel resource request message that portable terminal produces when initiating data session.In addition, resource request can be initiated by many other reasons, and for example the poll of response to network has been not described in detail here.
During the IFW steps in decision-making, the IFW of the most suitable portable terminal current wireless communication environments of network decision.This step relates to the channel measurement substep that is used to estimate portable terminal dissemination channel condition.IFW judges and can carry out in several ways, includes, but are not limited to (i) table query script, and channel condition and IFW value are mated, or (ii) worst condition assigning process, makes mobile device always distribute the available IFW of maximum.If determine that subsequently littler IFW can be used for portable terminal completely, then carry out the IFW handoff procedure so that distribute SF, transmitter or carrier wave for portable terminal once more with littler IFW.
In case resource request and IFW steps in decision-making finish then resource allocation step begins.In this step, network sends to portable terminal with signaling message, and the resource of portable terminal is distributed in indication.Portable terminal can send the transmitted over resources of confirming and beginning distributing to network.
Accurate resource request and resource allocation process rely on the concrete wireless communication standard that will use.Above-mentioned specification provides the general points of view how the IFW assigning process is carried out in the wireless universal net.Be assigned to portable terminal and portable terminal execution IFW handoff procedure when beginning to utilize the assigned radio resource transmission when new to resource.Fig. 6 represents the flow chart of IFW handoff procedure.This process comprises a plurality of steps: channel measurement, IFW switch decision, IFW switch indication and IFW switches execution.
The channel measurement step comprises the estimation of continuous measurement and channel condition.For forward link, portable terminal is carried out channel measurement; Measurement result sends to network then.For reverse link, network is carried out channel measurement.
After each measuring period, network enters IFW switch decision step.In this step, network is that portable terminal is determined correct forward direction and reverse link IFW size, and judges whether that should carry out IFW by portable terminal switches.Attention can only be that forward link, reverse link or forward direction and reverse link are carried out the IFW switching according to network.In addition, whether should carry out IFW and switch the many factors of dependence, include, but are not limited to the order of severity of portable terminal disturbed condition and the traffic load of channel.Even determine that therefore another different IFW is more suitable for the current disturbed condition of portable terminal, can not carry out IFW and switch.
IFW handover if desired, network enter IFW and switch the indication step.In this step, network should be carried out IFW to portable terminal indication and switch, and for portable terminal provides all relevant parameters, for example sign of new channel, new transmitter or new carrier wave, so mobile device can be carried out IFW and switches.
Last step is the IFW switch step when portable terminal is carried out the IFW handover of being indicated by network.
Obviously, for a person skilled in the art, can carry out various modifications to the present invention and be used for cell selecting method, and not depart from scope and spirit of the present invention.The present invention wishes to cover modification and the change that falls into the system and method provided by the present invention in claim and the equivalency range thereof.In addition, the present invention covers the current and new application of this system and method.
Claims (20)
1. method that makes air interface adapt to the radio propagation conditions of different mobile terminal, wherein:
Described air interface is divided into a plurality of parts of time domain, spatial domain, frequency domain or its any combination, each part is assigned with one group of orthogonal intersection with noiseless window, and at least two parts are assigned with the different orthogonal spectrum expansion code character with different noiseless windows.
2. method according to claim 1, wherein said air interface is divided into a plurality of subframes in time domain.
3. method according to claim 1 and 2, wherein said orthogonal intersection are the LS sign indicating numbers.
4. method according to claim 1 and 2, wherein said a plurality of parts are divided into a plurality of groups, and each group is relevant with a noiseless window.
5. method according to claim 4, wherein said orthogonal intersection are the LS sign indicating numbers.
6. method of giving portable terminal with allocation of radio resources, wherein:
Described air interface is divided into a plurality of parts of time domain, spatial domain, frequency domain or its any combination, each part is assigned with one group of orthogonal intersection with noiseless window, at least two parts be assigned with different orthogonal spectrum expansion code character with different noiseless windows and:
Described portable terminal be assigned with the relevant Radio Resource of noiseless window that is suitable for described portable terminal radio propagation conditions.
7. method according to claim 6, wherein said portable terminal be assigned with the relevant Radio Resource of noiseless window that is suitable for most described portable terminal radio propagation conditions.
8. method according to claim 6, wherein the initial wireless propagation conditions of the described portable terminal of estimation before giving described portable terminal with allocation of radio resources.
9. method according to claim 6, wherein:
In described communications of Mobile Terminals dialogue therebetween, network is estimated the radio propagation conditions of portable terminal continuously and is considered that current radio propagation conditions is to described portable terminal distribution another Radio Resource relevant with another noiseless window.
10. method according to claim 6, wherein said air interface is divided into a plurality of subframes in time domain.
11. according to claim 6 or 10 described methods, wherein said orthogonal intersection is the LS sign indicating number.
12. according to claim 6 or 10 described methods, wherein said a plurality of parts are divided into a plurality of groups, each group is relevant with a noiseless window.
13. method according to claim 12, wherein said orthogonal intersection are the LS sign indicating numbers.
14. adjust the method for distributing radio resource for one kind, wherein:
Described air interface is divided into a plurality of parts of time domain, spatial domain, frequency domain or its any combination, each part is assigned with one group of orthogonal intersection with noiseless window, at least two parts be assigned with different orthogonal spectrum expansion code character with different noiseless windows and:
In described communications of Mobile Terminals dialogue therebetween, network is estimated the radio propagation conditions of portable terminal continuously and is considered that current radio propagation conditions is to described portable terminal distribution another Radio Resource relevant with another noiseless window.
15. method according to claim 14 is wherein except considering the current radio propagation conditions of described portable terminal, in the factor that should also consider other when described portable terminal distributes another Radio Resource relevant with another noiseless window.
16. method according to claim 15, wherein said other factor comprises the traffic load of channel.
17. method according to claim 14, wherein said air interface is divided into a plurality of subframes in time domain.
18. according to claim 14 or 17 described methods, wherein said orthogonal intersection is the LS sign indicating number.
19. according to claim 14 or 17 described methods, wherein said a plurality of parts are divided into a plurality of groups, each group is relevant with a noiseless window.
20. method according to claim 19, wherein said orthogonal intersection are the LS sign indicating numbers.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2000/000140 WO2001095656A1 (en) | 2000-06-05 | 2000-06-05 | Methods for assigning radio resources |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1433654A true CN1433654A (en) | 2003-07-30 |
| CN1241450C CN1241450C (en) | 2006-02-08 |
Family
ID=4574664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00818857.2A Expired - Fee Related CN1241450C (en) | 2000-06-05 | 2000-06-05 | Method for assigning radio resources |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1305965A1 (en) |
| CN (1) | CN1241450C (en) |
| AU (1) | AU2000250580A1 (en) |
| WO (1) | WO2001095656A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101828359B (en) * | 2007-12-03 | 2012-11-14 | 中兴通讯股份有限公司 | A method for coordinating the resources between cells |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1146163C (en) * | 2000-10-20 | 2004-04-14 | 华为技术有限公司 | Method of raising TD-CDMA system channel estimation accuracy |
| AU2003207222A1 (en) * | 2003-01-23 | 2004-08-13 | Linkair Communications, Inc. | Method and device for searching and selecting cell |
| US11298701B2 (en) | 2018-11-26 | 2022-04-12 | King Instrumentation Technologies | Microtiter plate mixing control system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2158269A1 (en) * | 1994-02-25 | 1995-08-31 | Michael Dale Kotzin | Method and apparatus for time division multiplexing the use of spreading codes in a communication system |
| US5515396A (en) * | 1994-02-25 | 1996-05-07 | Motorola, Inc. | Method and apparatus for selecting a spreading code in a spectrum spread communication system |
| US5930230A (en) * | 1996-05-28 | 1999-07-27 | Qualcomm Incorporated | High data rate CDMA wireless communication system |
-
2000
- 2000-06-05 CN CN00818857.2A patent/CN1241450C/en not_active Expired - Fee Related
- 2000-06-05 EP EP00934847A patent/EP1305965A1/en not_active Withdrawn
- 2000-06-05 WO PCT/CN2000/000140 patent/WO2001095656A1/en not_active Application Discontinuation
- 2000-06-05 AU AU2000250580A patent/AU2000250580A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101828359B (en) * | 2007-12-03 | 2012-11-14 | 中兴通讯股份有限公司 | A method for coordinating the resources between cells |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001095656A1 (en) | 2001-12-13 |
| AU2000250580A1 (en) | 2001-12-17 |
| EP1305965A1 (en) | 2003-05-02 |
| CN1241450C (en) | 2006-02-08 |
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