CN1784908A - Method and apparatus for receiving site selection diversity transmit (SSDT) signal in a wideband code division multiple access (WCDMA) system - Google Patents
Method and apparatus for receiving site selection diversity transmit (SSDT) signal in a wideband code division multiple access (WCDMA) system Download PDFInfo
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- CN1784908A CN1784908A CN 200480012033 CN200480012033A CN1784908A CN 1784908 A CN1784908 A CN 1784908A CN 200480012033 CN200480012033 CN 200480012033 CN 200480012033 A CN200480012033 A CN 200480012033A CN 1784908 A CN1784908 A CN 1784908A
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Abstract
Disclosed is a UE and a method to operate the UE in the Site Selection Diversity Transmit mode. The method includes detecting a case where no base station is transmitting to the UE; inserting predetermined values into a received signal; and decoding the predetermined values. The predetermined values preferably correspond to zero bits.
Description
Technical field
The present invention generally relates to cell phone system, terminal and subscriber equipment (UE), or rather, relates to based on switching in the system of CDMA and soft hand-off.
Background technology
At present, the process of having stipulated a kind of SSDT of being called (website select diversity transmission power control) is for using in the receiver based on the system of WCDMA (Wideband Code Division Multiple Access (WCDMA)).SSDT is a kind of macro diversity method that uses under soft handoff mode, and wherein UE selects a sub-district as the main plot from its work set of cells.Be non-main plot with all other cell classification in this working set then.Main purpose only is that ((BS) is to UE from the base station) transmits on the down link of autonomous cell coming, thereby reduces under soft handoff mode by from the caused interference of the multiplexing of other base station.During traditional soft handover, UE can receive the transmission from more than one base station simultaneously.
In order to select a main plot, each sub-district has been assigned a temporary mark (ID), and UE periodically notifies the sub-district that is connected the ID of main plot.Turn-off their through-put power by the non-main plot of this UE selection.
In the SSDT technology, as mentioned above, UE uses DPCCH (Dedicated Physical Control Channel) to signal the sub-district ID of the Node B of an expectation on up link.Yet in the deployment scenario of reality, for the mistake in the FBI that is used for transmitting sub-district ID (feedback information) bit occurs, there is the possibility of non-zero somewhat.Because the mistake possibility of this non-zero, can occur by the UE signaling is the situation that the Node B of main plot detects code word mistakenly, and therefore this Node B is not born the role of main plot for the UE of this signalling.In this case, Node B is communicating downlink DPCH (DPCH) not, because it will be interpreted as time sub-district itself.Owing to do not have downlink signaling to notify UE which or which sub-district the role of its () to be interpreted as main plot or inferior sub-district, therefore will attempt to be assumed to the sub-district reception DPCH of main plot from it according to the UE of current techniques standardized operation.Yet, attempt will cause undesirable degradation of decoder capabilities to the decode result that brought of non-existent bit (noise) among the down link DPCH.
Summary of the invention
According to the currently preferred embodiment of these instructions, overcome aforementioned and other problem, and realized other advantage.
The invention discloses a kind of UE and a kind of method of selecting this UE of operation under the diversity transmission pattern at website.This method comprises: detecting does not have the base station in situation about sending to this UE; In the signal that is received, insert predetermined value; And this predetermined value of decoding.This predetermined value is preferably corresponding to zero bit.
According to the method for selecting this UE of operation under the diversity transmission pattern at website, this UE selects a main plot, and goes up the sign (sub-district ID) of using feedback information (FI) bit to send this main plot at Dedicated Physical Control Channel (DPCCH).Fail to send the situation of downlink dedicated physical channels (DPCH) in response to detecting selected main plot to this UE, this UE is inserting predetermined sample value in the output of UE receiver before the UE channel decoder, and this predetermined sample value of decoding is zero bit, so that keep normal channel decoder operation.
The accompanying drawing summary
When reading in conjunction with additional accompanying drawing, the aforesaid aspect with other of these instructions will become more obvious in the detailed description of the preferred embodiment below, wherein:
Fig. 1 is the simplified block diagram of the embodiment of a wireless communication system, and this wireless communication system comprises and is suitable for implementing UE of the present invention;
Fig. 2 is the simplified block diagram of the UE receiver shown in Fig. 1;
Fig. 3 A-3D describes for chart various test case, the relative Ec/Ior of BLER (block error rate) (BLER);
Fig. 4 is the logical flow chart of diagram according to method of the present invention.
Embodiment
By the mode of introducing, and with reference to figure 1, shown the simplified block diagram of an embodiment who is suitable for implementing wireless communication system 10 of the present invention.This wireless communication system 10 comprises at least one travelling carriage or UE 100.Fig. 1 has also shown an exemplary Virtual network operator (network operator) 20, it has for example node 30, at least one base station controller (BSC) 40 or equivalent device and a plurality of base transceiver station (BTS) 50 that is used to be connected to such as the communication network of public or PDN, base transceiver station is also referred to as base station (BS), and these base stations make progress according to predetermined air-interface standard to UE100 transmitting physical and logic channel at forward direction or downlink side.Also have a reverse or uplink communication path from UE 100 to Virtual network operator, this communication path is carried mobile-originated access request and business.Sub-district 3 is associated with each BTS 50, and one of them sub-district means the fixed time and is counted as Serving cell in office, and adjacent sub-district will be counted as abutting subdistrict simultaneously.In the present invention, UE 100 is defined as the main plot with a sub-district 3A, and other sub-district 3B is as non-main plot, just as what discuss above.
Air-interface standard can be followed any suitable standard or agreement, and can enable both voice and data service, such as enabling to enter the Internet 70 and the data service of downloading webpage.In currently preferred embodiment of the present invention, the compatible WCDMA air-interface standard of air-interface standard is although this is not to implementing a restriction of the present invention.
UE 100 typically comprises a control unit or control logic, and such as a micro-control unit (MCU) 120, this MCU has an output and an input of being coupled to the output of keyboard or keypad 160 of being coupled to the input of display 140.UE 100 can be a handheld wireless phone, such as cell phone or personal communicator.UE 100 also can be contained in card or the module, and this card or module are connected to miscellaneous equipment during use.For example, UE 100 can be contained in the card or module of PCMCIA or similar type, the card of this PCMCIA or similar type or module are installed in the portable data processor during use, all kneetop computers in this way of this portable data processor or notebook computer, or or even can be by the computer of user's wearing.
MCU 120 is assumed that the memory 130 that comprises or be coupled to some type, comprise the nonvolatile memory that is used for storage operation program and out of Memory, and the volatile memory that is used for temporarily storing desired data, intermediate object program storage, the grouped data that receives, grouped data to be sent or the like.At least the part of these ephemeral datas can be stored among the data buffer 130A.For the present invention, suppose that operation sequence makes MCU 120 can carry out implementation basis method of the present invention required software program, layer and agreement, and can provide suitable user interface (UI) to the user via display 140 and keypad 160.Although do not show, can provide microphone and loud speaker usually so that the user can carry out voice call in the mode of routine.
UE 100 also comprises wireless portion, this part comprises a digital signal processor (DSP) 180 or high speed processor or logical circuit and radio receiving-transmitting unit of equal value, this radio receiving-transmitting unit comprises transmitter 200 and receiver 220, and they all are coupled to antenna 240 and are used for communicating with Virtual network operator.At least one local oscillator is provided,, has been used for tuning transceiver such as frequency synthesizer (SYNTH) 260.Data such as digitized speech and grouped data are sent out and receive by antenna 240.
In order to beg for the performance degradation of stating above overcoming, UE 100 at first attempts detecting exist (or the vacancy) from the down link DPCH of predetermined main plot 3A.If UE 100 detects the DPCH that is not transferred to it from main plot 3A, with reference to figure 2, UE 100 comes by will being inserted into the position corresponding to the bit of the DPCH radio frames that lacks corresponding to sample value of (soft) zero with regard to operation, thereby reduces the degradation at TTI (transmit timing interval).Effect at UE receiver 220 places is considered to be the perforation of increase.By operation by this way, just improved the performance of UE 100 decoders 225, this is because zero soft bit values (neutral value) does not have adverse influence to the operation of decoder 225, and can obtain effective performance gain.
Fig. 2 has shown an embodiment of receiver 220, this receiver 220 comprises a receiver amplifier 221, A/D converter (ADC) 222, a plurality of correlator or branch (finger) 223 (branch 1, a branch 2 ... the n of branch), combiner 224 and decoder 225.According to the present invention, receiver 220 also comprises and inserts zero power energy or functional block 226, is used for inserting in received signal before decoder 225 preferably the sample value corresponding to zero bit.
As stipulating that in 3GPP TS 25.214/5.2.1.4.1.1 each sub-district is given an interim ID during SSDT, this ID is used as website and selects signal.This ID is expressed as binary bit sequence.Have the coding ID of three kinds of different lengths to use for UE 100, they be represented as " length ", " in " and " weak point ".Wireless network 20 determines to use the coding ID of which kind of length.
In practice, this means if use " length " ID sign indicating number, and in time slot, have only a FBI bit, report rate so be exactly every frame once.Correspondingly, if use " weak point " ID sign indicating number, and two FBI bits are arranged in time slot, so every frame just has five reports.
Chart among Fig. 3 A, 3B (situation of long ID sign indicating number) and 3C, the 3D (situation of short ID sign indicating number) is carried out reference.In the ideal case, if UL mistake (for example, having 1% possibility) takes place, be not have BS 50 transmitting with regard to about 99% possibility is arranged so, and about 1% possibility is arranged is that the BS 50 of non-expectation will transmit.Because branch 223 always is assigned to the BS50 that transmits,, UE 100 takes place so having known whether the UL mistake.If transmitting without any BS 50, the output of combiner 224 is exactly zero so.
Have in the situation of uncorrelated UL mistake at another kind, the mistake occurrence rate as above is assigned with but branch 223 is based on the sub-district ID of report, and just, whether UE 100 does not know to have the UL mistake to take place.In other words, UE 100 distributes a branch 223 to the BS 50 that it is expected at transmission DPCH, but does not receive signal (following situation (3)).Inserting zero functional block 226 is exactly to operate in this case.UE 100 can detect desired main BS 50 and not transmit, this detection is by for example determining in assignment to existing energy very little to carry out in the branch 223 of main BS 50, just, if the energy that the branch 223 of institute's assignment comprises is less than desired energy under its actual demodulation DPCH situation.
The possibility of irrelevant code word mistake (P_e) situation that the present invention is concerned about most is as follows:
1) P (BS1 opens, and BS2 closes, and wherein BS1 is a dominant base)=(1-P_e) * (1-P_e)=0.9801, just, BS2 supposes that not in the possibility of transmitting BS1 should transmit to BS1 transmitting,
2) P (BS1 opens, and BS2 opens, and wherein BS1 is a dominant base)=(1-P_e) * P_e=0.0099,
3) P (BS1 closes, and BS2 closes, and wherein BS1 is a dominant base)=P_e* (1-P_e)=0.0099, and
4) P (BS1 closes, and BS2 opens, and wherein BS1 is a dominant base)=P_e*P_e=0.0001.
When should being dominant base, BS2 can obtain identical result.
Enforcement of the present invention can be finished with the hardware in for example ASIC (application-specific integrated circuit (ASIC)), perhaps can finish with the software of being carried out by DSP 180, perhaps finishes with the combination of hardware and software.
This purposes of the present invention has improved the performance as wrong up link DPCCH transmission UE 100 result, under the SSDT pattern of operation.Performance gain along with reporting period length (for example, the report rate can be every frame 1,2,3,4 or 5 times report) increase and increase, and cost is owing to the slight raising that transmission gap is detected the complexity that (be called SSDT checking) cause here, just, detect those sub-districts and it is not identified as the situation of a main plot itself.
With reference to figure 4, the step below being used in website is selected the method for operation UE 100 under the diversity transmission pattern, carrying out.At square frame A, UE 100 detects the situation that does not have the base station transmitting to this UE; At square frame B, UE 100 generals preferably are inserted in the received signal corresponding to the predetermined value of zero bit; And at square frame C, decoder 225 these predetermined values of decoding are zero bit.
The description of front is by illustrative rather than restrictive example, to the current conception of the inventor be used to carry out the best approach of the present invention and equipment and provide one comprehensively and the narration of abundant information.Yet those skilled in the art consider the narration of front when reading with claims in conjunction with the accompanying drawings, various modifications and adaptively just become clearly.Yet, all this modifications of instruction of the present invention are all contained within the scope of the invention.And although method and apparatus described herein all has been provided specificity to a certain degree, the present invention can adopt more or less specificity to implement according to user's needs.And, correspondingly do not using under the situation of other characteristic, can advantageously use some characteristic of the present invention.Therefore, the description of front is appreciated that it only is the narration of explanation of the principles of the present invention, and should not be limitation of the present invention, because the present invention limits by following claim.
Claims (7)
1. select the diversity transmission pattern to finish drilling at website to make the method for user's equipment (UE), comprising for one kind:
Detecting does not have the base station in the situation that this UE is sent;
In the signal that is received, insert predetermined value; And
This predetermined value of decoding.
2. the method for claim 1, wherein this predetermined value is corresponding to zero bit.
3. select exercisable subscriber equipment (UE) under the diversity transmission pattern at website, comprising:
Be used to detect and do not have the device of base station in the situation that this UE is sent;
Be used for inserting the device of predetermined value at the signal that is received; And
The device of this predetermined value is used to decode.
4. subscriber equipment as claimed in claim 3, wherein this predetermined value is corresponding to zero bit.
5. the website selection diversity transmission pattern at the WCDMA wireless communication system is finished drilling and is made the method for user's equipment (UE), comprising:
Select a main plot;
Go up the sign (sub-district D) of using feedback information (FI) bit to send this main plot at Dedicated Physical Control Channel (DPCCH);
Fail to send the situation of downlink dedicated physical channels (DPCH) in response to detecting selected main plot, and in the output of UE receiver, inserting predetermined sample value before the UE channel decoder to this UE; And
This predetermined sample value of decoding is zero bit, so that keep normal channel decoder operation.
6. the website at wireless communication system is selected exercisable subscriber equipment (UE) under the diversity transmission pattern, comprising:
One radio-frequency (RF) transceiver comprises a transmitter and a receiver;
One decoder, it has the input of the output of being coupled to described receiver; And
One is coupled to the controller of this transceiver, described controller function comes for this UE selects a main plot, and goes up the sign (sub-district ID) of using feedback information (FI) bit to send this main plot at Dedicated Physical Control Channel (DPCCH) via described transmitter; Described controller is failed to this UE communicating downlink DPCH (DPCH) in response to selected main plot, and in the described input of described channel decoder, insert predetermined sample value, so that described decoder decode should predetermined sample value be zero bit.
7. UE as claimed in claim 6, wherein said wireless communication system comprises a code division multiple access system, wherein said receiver comprises at least one branch that is used for the demodulation received signal, and wherein said controller comes this DPCH of demodulation by this at least one branch of assignment, and determine existence energy very little in being assigned this at least one branch of this DPCH of demodulation, fail to this UE communicating downlink DPCH and detect selected main plot.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US46847103P | 2003-05-06 | 2003-05-06 | |
| US60/468,471 | 2003-05-06 | ||
| US10/805,994 | 2004-03-22 |
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| Publication Number | Publication Date |
|---|---|
| CN1784908A true CN1784908A (en) | 2006-06-07 |
| CN100586206C CN100586206C (en) | 2010-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200480012033A Expired - Fee Related CN100586206C (en) | 2003-05-06 | 2004-04-07 | Method and apparatus for receiving site selection diversity transmit (SSDT) signal in a wideband code division multiple access (WCDMA) system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101601325B (en) * | 2007-01-31 | 2013-05-29 | 高通股份有限公司 | Method and apparatus for reducing call setup delay by adjusting sib7 and sib14 scheduling frequency |
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- 2004-04-07 CN CN200480012033A patent/CN100586206C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101601325B (en) * | 2007-01-31 | 2013-05-29 | 高通股份有限公司 | Method and apparatus for reducing call setup delay by adjusting sib7 and sib14 scheduling frequency |
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| CN100586206C (en) | 2010-01-27 |
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