CN1150697C - TDD framing method for physical layer of wireless system - Google Patents

TDD framing method for physical layer of wireless system Download PDF

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Publication number
CN1150697C
CN1150697C CNB008151059A CN00815105A CN1150697C CN 1150697 C CN1150697 C CN 1150697C CN B008151059 A CNB008151059 A CN B008151059A CN 00815105 A CN00815105 A CN 00815105A CN 1150697 C CN1150697 C CN 1150697C
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frame structure
sign indicating
subframe
short frame
emission
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CN1385013A (en
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李道本
张永生
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Linkair Communications Inc
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Linkair Communications Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2618—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid code-time division multiple access [CDMA-TDMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70702—Intercell-related aspects

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

Abstract

The present invention relates to a TDD framing method for a physical layer of a wireless system, wherein each frame comprises a plurality of DPCH short frame structures and at least comprises a CCPCH short frame structure. Each DPCH short frame structure can be distributed to an uplink or a downlink and comprises a plurality of time slots. The number of the time slots can be determined by the pulse number of an LA code, the length change of the time slots is changed with the pulse interval of the LA code, and each time slot can be simultaneously modulated by selected orthogonal spread spectrum codes. The CCPCH short frame structure can be distributed to the downlink in even/odd frames, and the uplink is distributed to odd/even frames. The method of the present invention can greatly reduce the adjacent cell interference (ACI), the requirements of the spread spectrum code number, and the requirements of the spread spectrum code length in a wireless system. Meanwhile, the present invention can ideally support mobile IP services.

Description

A kind of TDD framing method that is used for physical layer of wireless system
Technical field
The present invention relates generally to wireless communication system, a kind of method that is used for the frame structure of time division duplex (TDD) pattern that provides is provided for it, and it can particularly in IP class business, provide higher capacity and performance in mobile communication business.
Background technology
Today, mobile communication has become one of key factor that influences our life style.Can predict, following communication network will be " mobile IP " network.
With regard to " moving ", key is to support higher spectrum efficiency and higher rate travel.And for " IP ", key is to support uneven traffic carrying capacity, higher throughput and less delay.
We know that multiple access technology and duplex technology are the key technologies of system design.Frequency Division Duplexing (FDD) (FDD) FDMA is used in the 1st generation system.FDD TDMA and FDD CDMA are used in the second-generation system.In recommended the 3rd generation system, FDD CDMA is used to UTRA FDD (or W-CDMA) and IS-2000 among the two, and TDD CDMA/TDMA is used to UTRA TDD and TD-SCDMA among the two.From the angle of technology,, can support " mobile IP " business with multiple access scheme FDMA/CDMA/TDMA and TDD combination.
As everyone knows, the capacity of cdma system is subject to interference.This interference comprises from the intersymbol interference between the multipath signal of same remote unit (ISI), disturb (MAI) from the multiple access between the signal of different remote units in the same base station service area, and from the neighbor cell interference (ACI) between the remote unit signal of adjacent base station and service thereof.
In existing C DMA wireless system, in order to reduce neighbor cell interference (ACI), at a time, the different base station in the different neighbor cells must use different spreading codes.Therefore the code length of spreading code must be very long so that enough spreading codes are provided.This has just increased the complexity of system widely.
Existing C DMA wireless system uses the pseudorandom spread spectrum sign indicating number that causes non-zero to disturb.Even if use provide zero disturb such as the orthogonal intersection of walsh code the time owing to exist from the multipath signal of same remote unit or asynchronous from the signal of different remote units, its orthogonal property can be damaged, and causes the interference between unlike signal.
Apply at PCT, application number is PCT/CN98/00151, invent artificial Li Daoben, denomination of invention is in " a kind of spread spectrum multiple access coding method ", disclosed a kind of coding method that is called big region code (LA sign indicating number), wherein spectrum-spreading address code is by one group of normalization amplitude, basic pulse by polarity is formed, the number of basic pulse is determined by following these practical factors: the number of user's request, the number that can be used for the pulse compression sign indicating number, the number that can be used for orthogonal carrier frequencies, the maximum communication rate of system bandwidth and system, these basic pulses are different on time shaft at interval, and coding has utilized the different of the difference of pulse position and pulse polarity just.Below this sign indicating number will be known as LA sign indicating number or LA-CDMA sign indicating number, they have identical implication.
A kind of basic LA-CDMA sign indicating number of table 1 expression with 17 pulses, and have corresponding 17 sequence of time slots and different length thereof.
The LA-CDMA sign indicating number that table 1 is basic
Time slot 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Ts length 136 138 140 142 144 146 148 150 152 154 156 158 160 162 164 137 172
Pulse position 0 136 274 414 556 700 846 994 1144 1296 1450 1606 1764 1924 2086 2250 2387
When relaxing the restriction of orthogonality, promptly adopt the accurate orthogonality of having used incomplete orthogonal code to increase user's number.For example, consider to have the LA sign indicating number of N pulse, because the order of N basic interval is to its auto-correlation and not influence of cross-correlation function, so it can be arbitrarily.When utilizing the code character with different basic interval orders simultaneously, user's number will increase greatly.
The orthogonal property of LA sign indicating number or accurate orthogonal property can be used as the solution that coverage or channel disturbance are faced in a kind of minimizing mutually.
Summary of the invention
The objective of the invention is to, a kind of time division duplex framing method that is used for physical layer of wireless system is provided.It can reduce from the neighbor cell interference between the signal of the remote unit of adjacent base station and its service (ACI).
Purpose of the present invention and effect will be realized by following method:
A kind of time division duplex framing method that is used for physical layer of wireless system, wherein, each frame comprises: the short frame structure of a plurality of DPCH (DPCH:Dedicated Physical Channel), its each can be assigned to up link or distribute to down link and comprising a plurality of time slots, the number of described time slot can be determined by the pulse number of a big region code, the variation of described slot length changed with the pulse spacing of described big region code, each time slot can be modulated by chosen orthogonal intersection simultaneously, and the short frame structure of at least one Common Control Physical Channel (CCPCH:Common Control Physical Channel), it is assigned to down link at idol/strange frame, and very/even frame is assigned to up link.
The present invention also comprises the downlink information step of transmitting of utilizing described time division duplex framing method, and the short frame structure of Common Control Physical Channel described here is used for a plurality of symbols of downlink broadcast and synchronizing channel (BSCH:Broadcastand Synchronization channel); Wherein, the step of emission of broadcasting and synchronous channel information and control and user profile emission comprises:
The step that described broadcasting and synchronous channel information emission comprise is:
With downlink broadcasting with synchronous channel information is multiplexing and coding enters a data flow,
Data flow is divided into superframe and frame;
The 1st subframe in selected idol/strange frame is so that the emission of broadcasting and synchronizing information; And
To broadcast with synchronizing information according to the broadcasting and the short frame structure of synchronizing channel and to be mapped to this subframe;
The step that described control and user profile emission comprise is:
According to the measurement that the real-time multipath of relative users is delayed, determine the demand of noiseless window width;
According to relative users real-time multispectral being reined in or the measurement of translational speed, determine number of pilot symbols purpose demand in each subframe;
According to the characteristic of business with frame structure, determine the transfer point between the transmitting-receiving, perhaps this is single transfer point, or a plurality of transfer point;
According to the demand of coverage, determine the gap length between the transmitting-receiving, and this length can be regulated by the perforation of the symbol in the corresponding subframe with the short frame structure of DPCH or Common Control Physical Channel;
According to traffic data rate, determine the demand of number of subframes with the short frame structure capacity of DPCH;
User profile is divided into different subframes;
And, user profile is mapped to effective subframe.
The present invention also comprises the uplink information transmissions step of utilizing described time division duplex framing method, and the short frame structure of Common Control Physical Channel described here is used for a plurality of access slots of up access channel (ACH:Access Channel); Wherein,
The step that access channel information emission and control and user profile emission comprise is:
The step that described access channel information emission comprises is:
Uplink random access channel information multiplexing and coding are entered a data flow,
Data flow is divided into superframe and frame;
The 1st subframe in very selected/even frame is so that the emission of uplink random access information; And
According to the short frame structure of access channel, random access information is mapped to this subframe;
The step that described control and user profile emission comprise is:
According to the measurement that the real-time multipath of relative users is delayed, determine the demand of noiseless window width;
According to relative users real-time multispectral being reined in or the measurement of translational speed, determine the demand of number of pilots in each subframe;
According to the characteristic of business with frame structure, determine the transfer point between the transmitting-receiving, perhaps this is single transfer point, or a plurality of transfer point;
According to the demand of coverage, determine the gap length between the transmitting-receiving, and this length can be regulated by the perforation of the symbol in the corresponding subframe with the short frame structure of DPCH or Common Control Physical Channel;
According to traffic data rate, determine the demand of number of subframes with the short frame structure capacity of DPCH;
User profile is divided into different subframes;
And, user profile is mapped to effective subframe.
At described a kind of time division duplex framing method that is used for physical layer of wireless system, each frame is comprising the short frame structure of a kind of polynary DPCH and the short frame structure of at least one CCPCH.The short frame structure of each described polynary DPCH can be assigned to up link or distribute to down link and comprising a kind of polynary time slot, the number of described time slot can be determined that by the pulse number of a LA sign indicating number length of described time slot changes with the variation in the pulse spacing of described LA sign indicating number.And each time slot can adopt selected orthogonal intersection to modulate.And the short frame structure of described CCPCH is assigned to down link at idol/strange frame, and very/even frame is assigned to uplink.
The positional alignment of described LA sign indicating number can be recombinated, and the arrangement of described time slot also can be recombinated accordingly.The pulse polarity of described LA sign indicating number can be transformed, and the polarity of described time slot also can be by corresponding conversion.
Different base station from different neighbor cells will be assigned with different LA sign indicating numbers so that reduce neighbor cell interference, and simultaneously at neighbor cell, identical spreading code can be assigned with.Therefore significantly reduced requirement, also reduced requirement spreading code length to the spreading code number.Simultaneously because the short frame structure of the described polynary DPCH of in each frame each can be assigned to up link or down link, so its desirable support inhomogeneous traffic carrying capacity, higher throughput and less delaying, i.e. " mobile IP service ".
Description of drawings
Enroll and constitute the accompanying drawing of this specification part, specific embodiment of the present invention has been described, and be used for explaining with standard, and non-limiting principle of the present invention and effect.
Fig. 1 is the frame structure of the UTRA TDD of a prior art, and it defines in 3G (Third Generation) Moblie partner program (3GPP:the Third Generation Project) standard.
Fig. 2 is the frame structure of the TD-SCDMA of another prior art, and it defines in the 3GPP standard.
Fig. 3 is a tdd frame structure according to preferred embodiment of the present invention.
Fig. 4 has illustrated the details according to TDD radio frames embodiment illustrated in fig. 3.
Fig. 5 is the short frame structure of DPCH according to preferred embodiment of the present invention.
Fig. 6 is a type according to the short frame structure of CCPCH of preferred embodiment of the present invention.
Fig. 7 is the another kind of type according to the short frame structure of CCPCH of preferred embodiment of the present invention.
Embodiment
Fig. 1 is the frame structure of general land wireless access (UTRA) time division duplex (TDD), and it defines in the 3GPP standard.Fig. 2 is the frame structure of TD-SCDMA, and it defines in the 3GPP standard.And can be designed to consistently with UTRA TDD with 1.28Mcps chip-rate according to tdd frame of the present invention, it will have similar frame structure to multiple transfer point.
For the system design of CDMA TDD, frame structure is one of The key factor.Some factors that relate generally to are capacity, coverage, flexibility and compatibility, will explain respectively it below.
Capacity is disturbed to be suppressed.The result of these interference sources is a kind of negative influence to systematic function and capacity.Disturb a lot of methods of once having attempted in order to reduce these.For example, in UTRA TDD and TD-SCDMA, joint-detection is used to reduce intersymbol interference (ISI) and multiple access disturbs (MAI), and smart antenna also is used to disturb to reduce among the TD-SCDMA.Although these technology can spend the performance that system complexity improves system, maximum problem is that because the defective of system design, above-mentioned all interference all can not be eliminated desirable level.
In CDMA TDD system, coverage is mainly decided by the gap length between the transmitting-receiving.The bigger bigger coverage of conversion interval support.But the length at this interval and capacity and spectrum efficiency are conflicting.In UTRA TDD, very little at interval so that adapt to the environment of microcellulor sub-district or Pico cell sub-district.In TD-SCDMA, at interval even as big as supporting the environment of big sub-district, so but it can not effectively support less sub-district because length at interval is fixed.
About flexibility, it is for supporting that in the TDD system flexible business has high requirement, so that can satisfy the application of " mobile IP ".A common way that is used for the TDD system is a dynamic channel allocation.But in the UTRA TDD that is similar to CDMA TDD system, because exist in the other interference interventional systems, so it is not very effective, and joint-detection can not well be worked.
About mobility, in traditional CDMA TDD system, fast closed-loop power control can not reach, because power control speed is determined by the length of frame.Bad power control will cause the serious degradation of systematic function.And higher translational speed means fast channel fading, and this just expects to compensate with fast power control.Therefore, it can not support high-speed mobile.The situation that Here it is in UTRA TDD.In TD-SCDMA, the reason of another restriction high-speed mobile is a smart antenna.
About compatibility, FDD is taken as two very different systems usually with TDD, even also exists basic difference between UTRA FDD and UTRA TDD.But from the pass point of technology, its existing general character is The more the better, because can reach the compatibility between FDD and the TDD like this.
At the artificial Li Daoben of invention, application number is PCT/CN00/00028, in the PCT application of denomination of invention for " a kind of spread spectrum multiple access coding method with zero correlation window ", has disclosed a kind of complementary orthogonal code, is called the LS sign indicating number here.The LS sign indicating number has the characteristic of " noiseless window ", and this is also referred to as " zero correlation zone " characteristic.As example, consider that following four code lengths are 8 LS sign indicating number:
(C1，S1)＝(++-+，+---)
(C2，S2)＝(+++-，+-++)
(C3，S3)＝(-+++，--+-)
(C4，S4)＝(-+--，---+)
Time shift between two sign indicating numbers is in the scope of (comprising head and the tail) window [1 ,+1] time, and any two cross-correlation in these yards is zero, and except when when not having time shift, the auto-correlation of any one in these yards is zero.Therefore, these four sign indicating numbers have the noiseless window of [1 ,+1].
Similarly following code length is that 16 LS sign indicating number has the noiseless window of [3 ,+3]:
(C1，S1)＝(++-++++-，+---+-++)
(C2，S2)＝(++-+---+，+----+--)
(C3，S3)＝(+++-++-+，+-+++---)
(C4，S4)＝(+++---+-，+-++-+++)
If we only consider that (C1 is S1) with (C2, S2), they have the noiseless window of [7 ,+7].Therefore when remote unit when the signal that one group of LS sign indicating number having utilized the noiseless window with [n ,+n] modulated is transmitted in the base station, receive the base station as long as these signals arrive each other in n chip, these signals just can not be interfering with each other.When from the multipath signal of same remote unit when signal from different remote units arrives in noiseless window, this has eliminated intersymbol interference and multiple access disturbs.
As first preferred embodiment of the present invention, described chosen orthogonal intersection can be the LS sign indicating number.And this framing method, frame, or, all will be known as the LAS-CDMA tdd mode following by the system that LA sign indicating number and LS sign indicating number are composited under tdd mode.
In above-mentioned preferred embodiment of the present invention, for zero correlation zone, promptly correlation is all interior signals of time window of zero, and ISI and MAI can be reduced to zero, and ACI can be reduced to critical level simultaneously.As long as from the multipath signal of same remote unit and from the signal of a plurality of remote units in the zero correlation zone inter-sync, ISI and MAI can be reduced to zero.Therefore, utilize the LSA-CDMA technology, can realize high systematic function and capacity ideally.
According to the preferred embodiment of LSA-CDMA tdd mode of the present invention, all signals will be stored in " noiseless " time window by bi-directional synchronization.And fast energy control is unwanted in this preferred embodiment, only adopts at a slow speed energy to control the energy of preserving mobile radio station.Therefore, high translational speed can reach easily.
About flexibility, in the preferred embodiment according to LAS-CDMA tdd mode of the present invention, FDMA/TDMA/CDMA is compound, and the multiple access scheme can be used.Emission/reception is based on the unit of " subframe (time slot)-sign indicating number-frequency ".The modularity of data cell can be used so that can support data rate variations, particularly grouped data.In a frame, because the transfer point of up link and down link can be by motor-driven distribution, and all subframes (time slot) can be by motor-driven up link or the down link distributed to, and all can support the inhomogeneous traffic carrying capacity of IP type.Therefore high flexibility can reach easily.
Preferable, described LS sign indicating number is inserted described time slot with the form of a LS frame, it has particular length and further comprises the S composition that is used to fill the C composition of C sign indicating number and is used to fill the S sign indicating number, and wherein the C sign indicating number of LS sign indicating number and S sign indicating number are inserted the described C of institute composition and S composition respectively.
Best, when the described C composition of being shorter in length than of the described LS sign indicating number that has distributed adds the length of the above S composition, a plurality of LS sign indicating numbers can be used to fill the described C composition and the described S composition of described LS frame.
Best, the transmitting-receiving conversion interval of TDD can be inserted among the continuous short frame structure.As second preferred embodiment of the present invention, last several time slots or symbol in each short frame structure can be set as sky or perforation, and described like this interval can be extended so that support bigger coverage rate.Therefore, can provide the feasibility of dynamic overlay area according to the frame structure of this preferred embodiment, that is, system can be revised flexibly so that can adapt to different overlay areas.It can support the Pico cell sub-district, schemes such as microcellulor sub-district and macro cells.
The frame structure of the 3rd preferred embodiment of the present invention is illustrated by Fig. 3.Wherein, 10ms radio frames, 5 subframes (SF) will be effectively, and each subframe can be assigned to up link or down link.The length of each subframe will depend on the type of the transmission channel that is mapped to this subframe.
In Fig. 4, show the details of above-mentioned radio frames.Each subframe can be assigned to up link or down link.The radio frames of two 10ms is considered.In 2K frame, BSCH is mapped to first subframe, will be used to the synchronous and propagation of down link simultaneously.In 2K+1 frame, ACH is mapped to first subframe, will be used to the access at random of down link simultaneously with synchronously.Remaining 4 subframes can be used to dedicated channel (DCH:Dedicated Channel) and transmit uplink traffic or downlink traffic in each frame.
The interval of the TDD of conversion depends on the type of the transmission channel that is mapped to this subframe between transmitting and receiving.Length at interval is used to conversion and the regularly adjusting of TDD between transmitting and receiving.
Consider the normal conditions in the example: for DCH, length at interval is 36 Tc=28.1 μ S, and for BSCH, gap length is 41Tc=32.0 μ S.For ACH, gap length is 44Tc=34.3 μ S.Therefore work as transfer point and divided timing flexibly, maximum coverage (or radius of society) will be 4.2km.
In order to support the bigger scope of covering, simple method is that last time slot in each subframe of BSCH, ACH or DCH can be set as null value or perforation, can be extended and can increases tolerance roundtrip propagation delay in such interval.But maximum coverage range also will be decided by the window width of ACH.
Be based on the have the LA sign indicating number compound LA/LS sign indicating number of (17,136,2559) by the short frame structure of the DPCH (DPCH) that DCH shone upon.It is illustrated in Fig. 5.Each subframe is filled by the LA sign indicating number of 2559Tc (seeing Table 1) by a code length.For a LA sign indicating number, have 17 pulses, and each pulse is substituted by the LS sign indicating number.So 17 time slots (TS) are arranged in a subframe.Last 36Tc is used to the conversion interval of TDD at interval.As default value, first time slot (TS) of each subframe always is used to pilot tone.In order to support high-speed mobile, a plurality of frequency pilot signs can be embedded in the subframe.16 remaining time slots are used to transfer of data.Wherein effectively each time slot of LS spreading code depends on data rate, communication environments or the like.In order to support different data rates, in a time slot, can adopt a plurality of LS sign indicating numbers right.With this TDMA/CDMA scheme, in the LAS-CDMA tdd mode, different data rates can be supported easily.
The short frame structure of CCPCH (Common Control Physical Channel) comprises two types.Class1 is used to the BSCH mapping, and type 2 is used to the ACH mapping.Figure 6 illustrates the short frame structure of Class1.Figure 7 illustrates type 2 short frame structures.
BSCH is mapped to the CCPCH of the short frame of Class1, the TDD conversion between here 41Tc is used to transmit and receive at interval.Have altogether that 87 symbols are launched, and the 1st symbol is reference symbol for DQPSK.So the data rate of BSCH is 8.6kbps.
As shown in Figure 4, BSCH is mapped to the 1st subframe of 2k frame.And base station (BS) will with the omnibearing emission of sufficient energy level it.
In order to support bigger coverage rate, last 2 characters can be omitted or bore a hole, so at interval can be extended.
ACH is mapped to the CCPCH of type 2 short frames, the TDD conversion between here 52Tc is used to transmit and receive at interval, and 16Tc is used to the guard period between ACH and the DCH at interval.Gap, 13 effective addresses is altogether arranged, and gap, 650 effective addresses is arranged altogether in 1 second.
As shown in Figure 4, ACH is mapped to the 1st subframe of 2k+1 frame.And mobile radio station (MS) will be launched it with the highest energy level.
Work as f=2GH z, during λ=0.15m, it is synchronous that each gap, address is designed to support uplink, the radius r of one of them sub-district 0For:
r 0 = 3 × 10 5 km / s × 48 1.28 MHz = 11.25 km
According to further preferred embodiment of the present invention, utilize framing method of the present invention to disclose a kind of method of downlink transmission information and a kind of method of uplink transmit information.
Downlink transmission control and user profile method are launched by broadcasting and synchronizing channel (BSCH) information emission and control and user profile and are formed.
Wherein, the emission of broadcasting and synchronizing channel (BSCH) information comprises:
With downlink broadcasting with synchronous channel information is multiplexing and coding enters a data flow;
Data flow is divided into superframe and frame;
The 1st subframe in selected idol/strange frame is so that the emission of broadcasting and synchronizing information;
Short frame structure according to BSCH arrives this subframe with the BSCH information mapping;
Wherein, the emission of control and user profile comprises:
According to the measurement that the real-time multipath of relative users is delayed, determine the demand of noiseless window width;
According to relative users real-time multispectral being reined in or the measurement of translational speed, determine number of pilot symbols purpose demand in each subframe;
According to the characteristic of business with frame structure, determine the transfer point between the transmitting-receiving, perhaps this is single transfer point, or a plurality of transfer point;
According to the demand of coverage, determine the gap length between the transmitting-receiving, and this length can be regulated by the perforation of the symbol in the corresponding subframe with the short frame structure of DPCH or CCPCH;
According to traffic data rate, determine the demand of number of subframes with the short frame structure capacity of DPCH;
User profile is divided into different subframes;
User profile is mapped to effective subframe.
A kind of up link control of adopting framing method of the present invention and user profile launching technique are launched by Random Access Channel (ACH) information emission and control and user profile and are formed.
Wherein, the emission of Random Access Channel (ACH) information comprises:
Multiplexed and uplink random access channel information coding enters a data flow;
Data flow is divided into super frame and frame;
The 1st subframe in very selected/even frame is so that the emission of uplink random address information;
According to the short frame structure of ACH, the ACH information mapping is arrived this subframe;
Wherein, the emission of control and user profile comprises:
According to the measurement that the real-time multipath of relative users is delayed, determine the demand of noiseless window width;
According to relative users real-time multispectral being reined in or the measurement of translational speed, determine the demand of guide's number of codes in each subframe;
According to the characteristic of business with frame structure, determine the transfer point between transmitting terminal and the receiving terminal, perhaps this is single transfer point, or a plurality of transfer point;
According to the demand of coverage rate, determine the gap length between transmitting terminal and the receiving terminal, and this length can be regulated by the perforation of the symbol in the corresponding subframe with the short frame structure of DPCH or CCPCH;
According to traffic data rate, determine the demand of number of subframes with the short frame structure capacity of DPCH;
User profile is divided into different subframes;
User profile is mapped to effective subframe.
It is conspicuous can making various changes to method of the present invention for a person skilled in the art, can not deviate from scope and spirit of the present invention.The present invention falls into covering the change and the variation of the system and method for described claim and equivalent thereof.In addition, the present invention covers the current and new application of system and method for the present invention.

Claims (12)

1. time division duplex framing method that is used for physical layer of wireless system, wherein, each frame comprises:
The short frame structure of a plurality of DPCH, its each be assigned to up link or distribute to down link and comprising a plurality of time slots, the number of described time slot is determined by the pulse number of a big region code, the variation of described slot length changed with the pulse spacing of described big region code, the chosen orthogonal intersection of each time slot is modulated simultaneously, and
The short frame structure of at least one Common Control Physical Channel, it is assigned to down link at idol/strange frame, and very/even frame is assigned to up link.
2. method according to claim 1, the positional alignment of wherein said big region code is recombinated, and the arrangement of described time slot is also recombinated accordingly.
3. method according to claim 1, the pulse polarity of wherein said big region code is transformed, and the polarity of described time slot is also by corresponding conversion.
4. method according to claim 1, wherein chosen orthogonal intersection are the LS sign indicating numbers.
5. method according to claim 4, wherein said LS sign indicating number is inserted described time slot with the form of a LS frame, it has particular length and further comprises C composition that is used for the C sign indicating number and the S composition that is used for the S sign indicating number, and wherein the C sign indicating number of LS sign indicating number and S sign indicating number are inserted described C composition and S composition respectively.
6. method according to claim 4, wherein when the length that described C composition adds the above S composition that is shorter in length than of the described LS sign indicating number that has distributed, a plurality of LS sign indicating numbers can be used to fill the described C composition and the described S composition of described LS frame.
7. method according to claim 1, an interval of the time division duplex of wherein changing between transmitting and receiving is inserted among the continuous short frame structure.
8. method according to claim 7, wherein last several time slots in each short frame structure or symbol are saved and are null value, and described like this interval is extended so that support bigger coverage.
9. method according to claim 1, wherein said frame are the length of 10ms, and described LA sign indicating number comprises 17 pulse spacings with minimum interval 136 chips.
10. according to claim 1 or 4 described methods, the short frame structure of wherein said Common Control Physical Channel comprises that in broadcasting and synchronizing channel the polarity chron of symbol is assigned to down link, comprises that at access channel the polarity chron of address time slot is assigned to up link.
11., it is characterized in that also comprising according to claim 1 or 4 described methods: the downlink information step of transmitting of described frame, the short frame structure of Common Control Physical Channel described here is used for a plurality of symbols of downlink broadcast and synchronizing channel; Wherein, the step of emission of broadcasting and synchronous channel information and control and user profile emission comprises:
The step that described broadcasting and synchronous channel information emission comprise is:
With downlink broadcasting with synchronous channel information is multiplexing and coding enters a data flow,
Data flow is divided into superframe and frame;
The 1st subframe in selected idol/strange frame is so that the emission of broadcasting and synchronizing information; And
To broadcast with synchronizing information according to the broadcasting and the short frame structure of synchronizing channel and to be mapped to this subframe;
The step that described control and user profile emission comprise is:
According to the measurement that the real-time multipath of relative users is delayed, determine the demand of noiseless window width;
According to relative users real-time multispectral being reined in or the measurement of translational speed, determine number of pilot symbols purpose demand in each subframe;
According to the characteristic of business with frame structure, determine the transfer point between the transmitting-receiving, perhaps this is single transfer point, or a plurality of transfer point;
According to the demand of coverage, determine the gap length between the transmitting-receiving, and this length can be regulated by the perforation of the symbol in the corresponding subframe with the short frame structure of DPCH or Common Control Physical Channel;
According to traffic data rate, determine the demand of number of subframes with the short frame structure capacity of DPCH;
User profile is divided into different subframes;
And, user profile is mapped to effective subframe.
12., it is characterized in that also comprising according to claim 1 or 4 described methods: the uplink information transmissions step of described frame, the short frame structure of Common Control Physical Channel described here is used for a plurality of access slots of up access channel; Wherein, the step that comprises of access channel information emission and control and user profile emission is:
The step that described access channel information emission comprises is:
Uplink random access channel information multiplexing and coding are entered a data flow,
Data flow is divided into superframe and frame;
The 1st subframe in very selected/even frame is so that the emission of uplink random access information; And
According to the short frame structure of access channel, random access information is mapped to this subframe;
The step that described control and user profile emission comprise is:
According to the measurement that the real-time multipath of relative users is delayed, determine the demand of noiseless window width;
According to relative users real-time multispectral being reined in or the measurement of translational speed, determine the demand of number of pilots in each subframe;
According to the characteristic of business with frame structure, determine the transfer point between the transmitting-receiving, perhaps this is single transfer point, or a plurality of transfer point;
According to the demand of coverage, determine the gap length between the transmitting-receiving, and this length can be regulated by the perforation of the symbol in the corresponding subframe with the short frame structure of DPCH or Common Control Physical Channel;
According to traffic data rate, determine the demand of number of subframes with the short frame structure capacity of DPCH;
User profile is divided into different subframes;
And, user profile is mapped to effective subframe.
CNB008151059A 2000-06-20 2000-06-20 TDD framing method for physical layer of wireless system Expired - Fee Related CN1150697C (en)

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