CN101657004B - Method and apparatus for receiving data in a wireless communications system - Google Patents

Method and apparatus for receiving data in a wireless communications system Download PDF

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CN101657004B
CN101657004B CN200910172816.1A CN200910172816A CN101657004B CN 101657004 B CN101657004 B CN 101657004B CN 200910172816 A CN200910172816 A CN 200910172816A CN 101657004 B CN101657004 B CN 101657004B
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data
frame
energy
control channel
shcch
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CN101657004A (en
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罗伯特T·洛夫
罗伯特S·尼基迪斯
卢艾A·贾卢尔
马克C·库达克
布赖恩K·克拉松
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Motorola Mobility LLC
Google Technology Holdings LLC
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Abstract

The invention discloses a method and apparatus for receiving data in a wireless communication system. A communication system includes a forward link from a base station to multiple mobile units, the forward link having multiple shared channels (SHCH's), multiple shared control channels (SHCCH's), and multiple dedicated pointer control channels (DPTRCH's), and utilizes HARQ error control for error detection and error correction. The mobile unit, when listening to the DPTRCH, uses a SHCCH pointed to by the DPTRCH to demodulate and decode data on the SHCH. Throughput problems may arise in the system when the mobile unit combines and decodes the wrong SHCH data, that is, SHCH data that is intended for a different mobile unit, or may incorrectly decodes SHCH data that is intended for the mobile unit. In order to improve the data throughput of the system, the systems employs a flush test and an energy detector test to prevent improperly decoded data blocks from corrupting properly decoded data blocks.

Description

In wireless communication system, receive the method and apparatus of data
The application divides an application, and the application number of original bill is 02804680.3, and the applying date is on February 7th, 2002, and denomination of invention is " in wireless communication system, receiving the method and apparatus of data ".
Technical field
The present invention relates to wireless communication system, relate in particular to the wireless communication system that comprises independent special-purpose and shared control channel.
Background technology
In typical case, in as the communication system of cdma system, example is in development WCDMA out, need to send data control system by dedicated channel on the basis of CDMA more specifically.In the forward link of these systems, with an independent channel, carry the information that will be launched, and the feature that is launched information is put in another independent forward control channel and is transmitted.In these channels, the walsh code that each has all used limited available walsh codes to concentrate.In order to make system avoid the restriction of walsh code, important measure is protection walsh codes resources.For these dedicated channel allocation are arrived to each user, in typical case, need between inactive state and active state, switch fast, thereby discharge walsh codes resources.
In order to realize in spread spectrum communication system, more effective code bit is distributed and walsh codes resources is distributed, on November 1st, 2000, submit to, the U.S. Patent application 09/703 that is entitled as " Apparatus and Method forProviding Separate Forward Dedicated and Shared Control Channels in aCommunications System (independent special use and the apparatus and method for of shared control channel are provided in communication system) ", in 775, propose: in order to communicate by letter realizing between transmitting communication equipment and communications receiving equipment, use dedicated pointer control channel (DPTRCH), shared control channel (SHCCH) and shared channel (SHCH).According to the information in each DPTRCH and SHCCH, can a plurality of communication equipments in communication system between dynamic assignment SHCH.
While containing the SHCH of dynamic assignment between a plurality of communication receiving devices in communication system, for communication equipment, the SHCH data that may decode and make mistake, that is to say, decode the SHCH data of intending to offer another different communication equipment.For example, communication equipment may be monitored DPTRCH, this DPTRCH is assigned to this communication equipment before this, but be assigned to now another different communication equipment, result causes communication equipment to offering the SHCCH decoding data of another communication equipment, and causes communication equipment to originally offering the SHCH decoding data of another communication equipment.Or communication equipment may carry out decoded in error to the DPTRCH data of intending to offer it, and the SHCCH of directed mistake.
In automatic repeat request (ARQ) and hybrid ARQ (HARQ) communication system, the decoding data that this plan is offered to another different communication equipment will cause the problem of throughput.In ARQ communication system, data block mistake being received by communication receiving device request retransmits to guarantee correctly to transmit data.HARQ system and ARQ system class be like part, by communication receiving device request resend the data block of wrong reception.Yet in HARQ system, communication receiving device is also preserved and used these fault data pieces is those data blocks that received by mistake, thereby improve coding gain.Fault data piece and the current data block receiving are combined, and decoding jointly, thereby performance can be improved.
If the data that the needs that fault data piece is not received by mistake are retransmitted, but this plan offers the data block of another different communication equipment,, in the process of combination common decoding, the fault data piece of storing can destroy the total data receiving before this.For example, when communication equipment carries out decoded in error to DPTRCH frame, will cause wrong SHCH to decode, now, in a packet that comprises a plurality of frames through sending, communication equipment may be positioned at the middle part of the packet receiving.Now very difficult to the correction of decoding, probably cause communication transmitting device to carry out repeatedly data re-transmitting, even reach default maximum number of retransmissions.In the situation that the chance that data are correctly decoded is few, repeatedly data are retransmitted to the waste that will cause throughput.
Therefore, there is a kind of demand: the data block that prevents incorrect decoding damages the data block of this pre-treatment.
Accompanying drawing explanation
Fig. 1 is communication system calcspar according to an embodiment of the invention.
Fig. 2 is the calcspar of the frame format of dedicated pointer channel according to an embodiment of the invention, represents a kind of distribution of form.
Fig. 3 is the calcspar of the frame format of dedicated pointer channel according to an embodiment of the invention, represents space formula.
Fig. 4 is the calcspar of the frame format of shared control channel according to an embodiment of the invention.
Fig. 5 is the calcspar of dedicated pointer channel frame generator and shared control channel frame generator according to an embodiment of the invention.
Fig. 6 is the logical flow chart of an example, and wherein each step is carried out by mobile unit, and mobile unit is to the decoding data receiving, in single user state to inactive state transient process.
Fig. 7 is the logical flow chart of an example, and wherein each step is carried out by mobile unit, and mobile unit is to the decoding data receiving, in single user state.
Fig. 8 is the logical flow chart of an example, and wherein each step is carried out by mobile unit, and mobile unit is to the decoding data receiving, in active state.
Fig. 9 represents in order to improve throughput, the logical flow chart of the execution step of communication system according to an embodiment of the invention as shown in Figure 1.
Figure 10 represents in order to improve throughput, the logical flow chart of the execution step of communication system according to an embodiment of the invention as shown in Figure 1.
Figure 11 is illustrated in the process of carrying out energy detector test, the logical flow chart of the execution step of communication system according to an embodiment of the invention as shown in Figure 1.
Figure 12 represents in order to improve throughput, the logical flow chart of the execution step of communication system according to an embodiment of the invention as shown in Figure 1.
Embodiment
In order to meet the demand of the method and apparatus that can not damage the data block of this pre-treatment a kind of data block that makes incorrect decoding, a kind of communication system is provided, it comprises from base station to the forward link of a plurality of mobile radio stations, in forward link, comprise a plurality of shared channels (SHCH), a plurality of shared control channel (SHCCH) and a plurality of dedicated pointer control channel (DPTRCH), also used HARQ error control method to carry out EDC error detection and correction.When mobile unit is monitored DPTRCH, mobile unit is used the SHCCH being pointed to by DPTRCH to carry out rectification and decoding to the data on SHCH.When mobile unit combines with decoding to wrong SHCH data, when the SHCH data that also this plan offered to another different mobile unit combine with decoding, or the SHCH data that may offer mobile unit to this plan are carried out decoded in error, will produce the problem of throughput in system.In order to increase the throughput of system, in system, used refresh testing (flush test) and energy detector measuring technology, prevent that the data block of incorrect decoding from destroying the appropriately data block of decoding.
Conventionally, in the embodiment of native system, comprise a kind of method that receives data in wireless communication system, the method comprises the steps: to receive shared channel data by shared channel; The shared channel data that receive are stored, produce the shared channel data of storage; By shared control channel, receive shared control channel data.The method further comprises step: to the shared control channel decoding data receiving, produce the shared control channel data of decoding; Whether the shared control channel data of judgement decoding are different from the shared control channel data that receive before this, when the shared control channel data of decoding are different from the shared control channel data that receive before this, abandon at least one in the shared control channel data of decoding and the shared channel data of storage.
In another embodiment of the present invention, comprise a kind of method that receives data in wireless communication system, the method comprises the steps: to receive data by control channel, produces and receives data; Determine the energy metric that receives data; Definite energy metric and threshold value are compared, when energy metric is less than threshold value, ignore the data that receive.
Comprise in another embodiment of the present invention communication equipment in, it comprises receiver and memory, and the two is operationally connected with processor separately.Receiver receives shared control channel data by shared control channel, by shared channel, receives shared channel data.The shared control channel data that memory stores receives before this, the shared channel data that also storage receives before this, to produce the shared channel data of storage.Processor, to the shared control channel decoding data receiving, produces the shared control channel data of decoding; Whether the shared control channel data of judgement decoding are different from the shared control channel data that receive before this, when the shared control channel data of decoding are different from the shared control channel data that receive before this, abandon at least one in the shared control channel data of decoding and the shared channel data of storage.
Comprise in another embodiment of the present invention communication equipment in, it comprise one operationally with the receiver of processing coupling.Receiver receives data by control channel, produces and receives data.Processor is determined the energy metric that receives data; Definite energy metric and threshold value are compared, when energy metric is less than threshold value, ignore the data that receive.
Referring to Fig. 1-12, can obtain more complete understanding to the present invention.In Fig. 1, illustrated according to the communication system 100 of the embodiment of the present invention.Although the present invention can be used in the communication system of any transmission packet, for example be used in time division multiple access (TDMA) communication system or OFDM (OFDM) communication system, communication system 100 is preferably code division multiple address communication system, for example CDMA 2000 or wideband CDMA (WCDMA).Communication system 100 comprises transceiver base station (BTS) 102 and a plurality of mobile units 104 (drawing), for example cell phone, mobile radiotelephone or other any can be used in the digital communication equipment that carries out block data communication.For example, mobile unit 104 can be the StarTAC that Motorola Inc. produces tMdigital cellular telephone, modifies to it for adapting to the present invention.Mobile unit 104 comprises reflector 110 and receiver 112, the two is all coupled with processor 114, processor 114 is further coupled to memory 116, the program that in memory, storage is carried out by processor, to carry out the function of mobile unit 104, in memory, also comprise a plurality of buffers, can storing mobile unit in buffer from base station 102 data that receive, for example control data or business datum.In another embodiment of the present invention, one or more buffers in processor 114, have been settled.
Communication system 100 further comprises 102 forward links 106 to a plurality of mobile units from base station, contains a plurality of shared channels (SHCH) 109 (shown in figure one), a plurality of shared control channel (SHCCH) 108 (drawing) and a plurality of dedicated pointer control channel (JDPTRCH) 107 (drawing) in forward link.In communication system 100, also comprise reverse link (not shown), for replying (ACK or NACK), from mobile unit, be sent to base station.In native system, it is stable only having DPTRCH 107, only allows those mobile units in active state to require further to control by SHCCH 108 and SHCH 109, to have more available walsh codes.With DPTRCH 107, point to a plurality of shared control channels 108 of the payload of supplementing DPTRCH 107, to transmit and to distribute on SHCH 109.
Fig. 2 has illustrated a kind of DPTRCH frame 200 typically with distribution form (when transmitting the information of relevant SHCCH 108 with frame).In frame 200, there are a plurality of information fields, be used to transmit user is remained on to the important information in the zonule of base station 102, and no matter whether user is in inactive or slave mode.First field refers to shows device or pointer field 202, is used for transmitting the information that whether has information to pass on shared control channel SHCCH, and the specific shared control channel SHCCH that is also used for pointing to this field transmits the assignment information of walsh code.The length of pointer field 202 can be any necessary length, is used for being transmitted as shared channel and sends the different sharing channel walsh code distributing.In one embodiment of the invention, the length of pointer field 202 is set as 3 and is, this shows that it has the nearly ability of the state of 8 SHCCH that transmits.
The link control field 204 of next field in DPTRCH frame 200 for retaining, it is for example illustrated in the information of the message column length shown in the field 212 in the link control field 104 that is contained in reservation for transmission information.In the link control field 204 retaining, preferably also comprise mixed automatic repeat request (HARQ) field (representing by the field 214 in the link control field 204 retaining) and reverse link scheduling information (not shown) in diagram.The information that also may comprise in the link control field 204 retaining has initial walsh code, Modulation and Coding Scheme (MCS) and automatic repeat request (ARQ) information.
In DPTRCH frame 200, also comprise the field 206 that is used for error detection, for example CRC (CRC) information.In addition, in frame 200, can comprise power control bits information 208, effect is the power of reverse link regulating in cdma system, in frame 200, can also comprise postamble 210, if use it, can be used for finishing convolution code.In typical case, the length of DPTRCH frame 200 is 5 milliseconds.Yet the time span of DPTRCH frame is not limited to this numerical value, so long as the frame length using in particular communications system, its value can correspondingly be adjusted.Similarly, in the situation that not deviating from the spirit and scope of the present invention, in DPTRCH frame, field and (with bit representation) width also can be adjusted, for example, the one or more length in field 204,206,208 and 210 is set to zero (0) position.As another example, DPTRCH frame can be reduced to and only comprise pointer field, is equivalent to only transmit an independent modulated symbol.
Fig. 3 illustrated, according to the DPTRCH frame 300 of " sky " form of the embodiment of the present invention, to that is to say, on corresponding SCHCCH without transmission information.Be similar to and distribute form 200, in empty frame 300, comprise pointer field 302, crc field 306, power control bits field 308 and postamble 310.Form 200 is different from distributing, and in cdma system, empty frame format 300 is only for reverse link transmits the reserved field 304 that comprises reverse link scheduling information.
Fig. 4 has illustrated SHCCH frame 400 according to an embodiment of the invention.SHCCH frame 400 comprises allocation field 402, wherein comprises and has different cycles or intermittent information, for example, in the information of SHCH being separated to timing needs, and transmits the HARQ feedback signal in the 3rd layer of signaling information.As shown, allocation field 402 in SHCCH frame 400 comprises field 408,410 and 412, it can comprise field 408, initial walsh code 410 and gain information 412, and wherein the effect of field 408 is specific modulation and encoding schemes (MCS) of using in explanation SHCH.Be similar to DPTRCH frame, also can comprise the postamble information in crc field 404 and field 406 in SHCCH frame 400, wherein each can be variable-length, and for example length is zero (0) position.In another embodiment of the present invention, in fact, allocation field 402 comprises gain information, HARQ information and the 3rd layer of information of posting a letter, and in DPTRCH frame, carries the information, MCS of initial walsh code and the HARQ information further of closing.Also the field distribution of DPTRCH frame 200 and SCHCCH frame 400 may be combined according to alternate manner.In addition, can also easily predict the further enhancing to this scheme, for example additional SHCCH level and to mobile unit receive and use code between carry out combined coding (can be error correction or error detection).
Within system of the present invention, in order to ensure there being the walsh code of enough numbers to use in forward shared channel, specifying DPTRCH 107 and SHCCH 108 is the part in walsh code tree, and does not overlap with the code in forward direction SHCH 109.For example, the walsh code that is 16 for length, specifying DPTRCH 107 and SHCCH 108 be the part in walsh code tree, and is not or not a yard 2-15 in 16 overlaps with length.In the mobile unit in active state, preferably only keep a unique DPTRCH who has distributed the walsh code that length is 512.
Fig. 5 has illustrated that a kind of device being included in base station 102, the effect of this device are to generate DPTRCH frame 200,300 and SHCCH frame 400.DPTRCH generator 502 comprises channel encoder 504, and effect is the control data " B " that for example receive, from reflector (base station), and using it as input.Should use the forced coding device with reasonable complexity.For example, in the situation that not deviating from spirit of the present invention and scope, when data are encoded, can use (tailed) convolution code and the tailbiting convolution code of BCH, magnetic tape trailer.16 or 64 conditional codes are carried out to the performance that tailbiting decoding can improve short code word.Tailbiting can be used for to the head of EDGE EGPRS.Use tailbiting can also make the available code bit in error detection field or other field more.Channel decoder 504 with specific bit rate for example, to data encode (, R=1/2 rate set).Then, coded data is sent in interleaver 506, according to an arbitrarily individual known interleaving scheme, data are interweaved.After data are interleaved, by M-modulator 508, for example, according to an arbitrarily individual known modulation scheme (, quadriphase PSK (QPSK), 16-quadrature amplitude modulation (16-QAM) or 64-quadrature amplitude modulation (64-QAM)) data are modulated.Then, the data after modulation are sent to multiplexer 510, it utilizes power control bits information that the data after modulation are carried out multiplexing.Power control bits information due to each mobile unit that need to be in the unit of base station 102, power control bits is comprised in DPTRCH frame, and with mobile unit in active state or single user state irrelevant (state when active state refers to that the data of transmission are moved unit and receive, single user state refers to the state while not having data to mail to mobile unit).Then, use multiplier 512 by the multichannel data B of output from multiplexer 510 dPTRwith walsh code w nmultiply each other, and with specific spreading rate Rc, result is sent.According to IS 95 standards, spreading rate preferably equals 1.2288 million chips (Mcps) per second, or according to the regulation of WCDMA, spreading rate preferably equals 3.84Mcps.
SHCCH frame generator 520 comprises the parts that are similar to DPTRCH frame generator 502, comprises convolution coder 522, interleaver 524 and M-modulator 526.Yet, due to only, by DPTRCH frame transmission power control position information, in SHCCH generator 520, do not need Port Multiplier.Therefore, with multiplier 528 by the control data B the modulation of sending from modulator 526 sCHwith walsh code w nmultiply each other, deliver to forward link 106 and transmit.Certainly, if the mobile unit of controlling data transmission is in single user state, can not pass through SHCCH frame generator 520 communications of control data B sCH.
Referring now to Fig. 6,7 and 8, figure in illustrated the possible problem that for example, exists in the performance of example communications system of use DPTRCH/SHCCH forward link (forward link 106).In the logic flow diagram of Fig. 6,7 and 8 explanations, adopted colored (coloring), this greatly reduces the possibility to the DPTRCH of another mobile unit or SHCCH misinterpret.Fig. 6 is the logic flow diagram 600 of example, the process that expression for example, for example, is decoded to the DPTRCH frame receiving (DPTRCH frame 200 and 300) and the SHCCH frame (SHCCH frame 400) that receives, decoding is undertaken by the mobile unit in single user state no longer, for example the mobile unit from single user state to inactive state transition.For example, for example, for being previously exclusively used in the upper DPTRCH frame transmitting of the DPTRCH of mobile unit (DPTRCH 107) by base station, first mobile unit may be in single user state.Base station be sure of that first mobile unit is static, and DPTRCH is exclusively used in to second mobile unit.Yet first mobile unit does not also complete and transfers to inactive state, so still monitor DPTRCH.Base station does not recognize that first mobile unit still monitors DPTRCH, by DPTRCH, to second mobile unit, transmits DPTRCH frame.
Logic flow 600 receives DPTRCH frame from first mobile unit by DPTRCH and frame is decoded (602).Because DPTRCH frame is not originally to provide to first mobile unit, therefore by decoded in error.First mobile unit is carried out an error detection verification (for example CRC check) to the DPTRCH frame of decoded in error, and whether judgment frame is correctly received and decodes.When the error detection verification that the DPTRCH frame of decoding is carried out detects mistake (604), first mobile unit is ignored DPTRCH frame (606), and this is a good result.Suppose " P m1" representative is when frame is during by decoded in error; if the error detection verification that the DPTRCH frame of decoding is carried out fails to detect the probability of the mistake (being also " failure of DPTRCH error detection ") existing in frame, first mobile unit correctly detects (604) to go out the probability that has mistake in frame and ignore (606) this frame is " 1-P m1".It should be noted that if do not have mistake in using to detect, P m1=1.
When error detection verification fails to detect the mistake (604) existing in the DPTRCH frame of decoding, (probability is P m1), and the DPTRCH frame of decoding is while being empty frame (608), first mobile unit keeps single user state (610), and obtains certain suitable result.When the verification of DPTRCH error detection fails to detect the mistake (604) existing in the DPTRCH frame of decoding, and the DPTRCH frame of decoding during non-NULL frame (608), first mobile unit for example, for example, is decoded irrelevantly to the SHCCH frame (SHCCH frame 400) in the SHCCH by DPTRCH frame identification (SHCCH108), and (probability is approximately P m1).Then, first mobile unit is carried out error detection verification (614), for example CRC check to the SHCCH frame of decoding.When SHCCH error detection verification detects the mistake (614) in SHCCH frame, first mobile unit 104 is ignored (616) SHCCH frame, and this is a good result to a certain extent.Suppose " P m2" representative is when SHCCH frame is during by decoded in error; if the error detection verification that the SHCCH frame of decoding is carried out fails to detect the probability of the mistake (being also " failure of SHCCH error detection ") existing in frame, first mobile unit correctly detects the probability that (614) go out the correct SHCCH frame that receives and/or decode and ignore (616) this SHCCH frame and is approximately " P m1(1-P m2) ".
When first mobile unit is decoded (612) to this non-SHCCH frame that offers this mobile unit, and the verification of SHCCH error detection is failed to detect and in SHCCH frame, is had when wrong (614) (probability is approximately " P m1p m2"), first mobile unit according to the information in SHCCH frame to SHCH decoding data, and storage through decoding SHCH data.Then, the data of first mobile unit utilization storage are to the decoding data receiving before this (618).This may be the worst result showing in Fig. 6.First mobile unit has been no longer special-purpose, this unit misinterpret DPTRCH frame, and to being not yet assigned to SHCCH frame in its SHCCH channel, decode (' SHCCH ' of decoding error).Consequently, first mobile unit has carried out decoding and storing to the data that not offer it.In HARQ system, first mobile unit by the data of incorrect decoding therewith the SHCH data of pre-treatment combine, and the data after combination are decoded (' combination decoding error data ') jointly, may destroy the data that first mobile unit receives before this, it is a part for the grouping processed, but can not remain valid.By the form of probability, represent,
P{ ignores DPTRCH}=1-P m1
The SHCCH}=P of P{ decoding error m1, and
P{ ignores the SHCCH}=1 of DPTRCH}+P{ decoding error.
The SHCCH} of expansion P{ decoding error,
The SHCCH of P{ decoding error, ignores SHCCH}=P m1(1-P m2),
The SHCCH of P{ decoding error, merges and decoding error data }=P m1p m2.
Fig. 7 is the logic flow diagram 700 of example, the process that expression for example, for example, is decoded to the DPTRCH frame receiving (DPTRCH frame 200 and 300) and the SHCCH frame (SHCCH frame 400) that receives, decoding is undertaken by the mobile unit in single user state.Logic flow 700 for example, receives DPTRCH frame by DPTRCH (DPTRCH 107) from mobile unit and frame is decoded (702).In the process representing in Fig. 7, hypothesis for example, is not distributed to mobile unit by SHCCH (SHCCH 108), and DPTRCH frame is not that mobile unit is pointed to SHCCH, neither make mobile unit transfer to active state.When mobile unit is correctly decoded DPTRCH frame, when (704), mobile unit keeps single user state (706), and continues to monitor the DPTRCH that is exclusively used in mobile unit, and this is a good result.Suppose " P 1" represent that DPTRCH frame is not correctly received and/or not by correctly or the probability of being decoded irrelevantly, correctly DPTRCH to be decoded (704) and correctly keeps the shape probability of state of single user state (706) be " 1-P to mobile unit 1".
When mobile unit receives DPTRCH frame and/or decode (704) (probability is P mistakenly 1), or irrelevantly the DPTRCH frame being exclusively used in the DPTRCH of another different mobile unit is decoded, the error detection verification in DPTRCH frame detects and is not correctly received and/or (probability is not P by the mistake (708) in the DPTRCH frame of correct or decoded in error 1(1-P m1)), mobile unit is ignored (710) DPTRCH frame, and this is a good result to a certain extent.When the DPTRCH frame of incorrect reception and/or incorrect or incorrect decoding is carried out to the verification of DDPTRCH error detection, if fail to detect the mistake (708) in the DPTRCH frame of decoding, mobile unit for example, for example, is decoded irrelevantly to the SHCCH frame (HSCCH frame 400) in SHCCH (SHCCH 108), and mobile unit be sure of that this is that (probability is P to DPTRCH frame SHCCH pointed 1p m1), yet this SHCCH is also not yet assigned to mobile unit.Then, the SHCCH frame error detection verification (714) of mobile unit to decoding, for example CRC check.
When the verification of SHCCH error detection detects the mistake (714) in SHCCH frame, mobile unit 104 is ignored (616) SHCCH frame, and (probability is ' P 1p m1(1-P m2) ').Due to this non-mobile unit that offers of the data that comprise in SHCCH frame, can not be moved unit yet and decode rightly, this is a good result to a certain extent.Yet, when mobile unit is not to provide (712) while decoding to the SHCCH frame of mobile unit to this, and if the verification of SHCCH error detection fail to detect the mistake existing in SHCCH data (probability be P 1p m1p m2), mobile unit according to the information in SHCCH frame to not being the SHCH decoding data of wanting for mobile unit, and storage through decoding SHCH data.Then, mobile unit combines the SHCH data of storage and the SHCH data that receive before this, and to the data after combination jointly decode (718).Because the SHCH data of decoded in error can destroy the decoding of the data to receiving before this, this is very bad result.
In the flow process of Fig. 7 explanation, the result of hope is following square: ' without DPTRCH decoding error ' (704) and ' keeping special-purpose ' (706).Result ' is ignored DPTRCH ' (710) and ' SHCCH ' of decoding error (712) is undesirable result.Undesirable result ' ignore DPTRCH ' (710) if effect with before mobile unit transfers static state to, need it to observe ' without the DPTRCH decoding error ' of at least two DPTRCH frames identical.Yet if cause ' combination decoding error data ' (718), result ' mistake SHCCH decoding ' (712) may destroy the buffer of receiver.By the form of probability, represent,
P{ is without DPTRCH decoding error }=P{ keeps special-purpose }=1-P 1
P{ ignores DPTRCH}=P 1(1-P m1)
P{ mistake SHCCH decoding }=P 1p m1, and
P{ is without DPTRCH decoding error }+P{ ignores the SHCCH}=1 of DPTRCH}+P{ decoding error.
The SHCCH} of expansion P{ decoding error,
The SHCCH of P{ decoding error, ignores SHCCH}=P 1p m1(1-P m2)
The SHCCH of P{ decoding error, merges and decoding error data }=P 1p m1p m2.
Fig. 8 is the logic flow diagram 800 of example, represents process that DPTRCH frame (for example DPTRCH frame 200 and 300) and SHCCH frame (for example SHCCH frame 400) are decoded, decodes and is undertaken by the mobile unit in single user state.In logical flow chart 800, the data in SHCCH frame are expressed as colored.Logic flow 800 for example, receives DPTRCH frame by DPTRCH (DPTRCH 107) from mobile unit and frame is decoded (802).In the process representing in Fig. 8, suppose that DPTRCH wants mobile unit to point to the SHCCH (for example SHCCH 108) that is assigned to mobile unit.When mobile unit is appropriately decoded to DPTRCH frame, (probability is 1-P when (804) 1), mobile unit is correctly decoded (806) to the SHCCH frame in SHCCH, and this SHCCH is identified by DPTRCH, and is assigned to mobile unit.
When mobile unit is correctly decoded to SHCCH frame, (808) (probability is (1-P 1) (1-P 2)), mobile unit according to the information in SHCCH frame to SHCH decoding data, and storage through decoding SHCH data.Then, mobile unit combines the SHCH data of storage and the SHCH data that receive before this, and the data after combination are decoded (810) jointly, obtains a good result.When mobile unit carries out decoded in error to SHCCH frame, (808) (probability is (1-P 1) P 2), and the error detection verification of SHCCH data of decoding detect in the SHCCH data of decoding, exist wrong (812) (probability for ' (1-P 1) (P 2) (1-P m2)), ignore SHCCH frame (814), so just obtained to a certain extent good result.When mobile unit carries out decoded in error to SHCCH frame (808), and the error detection verification of SHCCH data of decoding is failed to detect and in the SHCCH data of decoding, is had wrong (812) (probability is (1-P 1) (P 2) (P m2)), mobile radio station carries out wrong decoding according to the SHCCH data of decoded in error to SHCH data.For example, the modulation scheme that mobile radio station may mistake in using or wrong bit rate be to SHCH decoding data, or may be to decoding data in wrong SCHC channel.Mobile radio station storage is by the SHCH data of decoded in error, and the SHCH data of storage and the data that receive are before this combined, and to the data after combination jointly decode (816).Because the SHCH data of decoded in error can destroy the decoding of the data to receiving before this, this is very bad result.
When mobile unit receives DPTRCH frame and/or decode (804) (probability is P mistakenly 1), and the error detection verification in DPTRCH frame detects mistake (818) in the DPTRCH frame that is not correctly received and/or decodes, and (probability is P 1(1-P m1)), mobile unit is ignored (820) DPTRCH frame, and this is a good result to a certain extent.When mobile unit receives DPTRCH frame and/or decode (804) (probability is P mistakenly 1), and the error detection verification in DPTRCH frame fails to detect mistake (818) in the DPTRCH frame that is not correctly received and/or decodes, and (probability is P 1p m1), but be not correctly received and/or the DPTRCH frame of decoding is empty frame (822), mobile unit is to single user state transition (824), and continues to monitor the DPTRCH that is exclusively used in mobile unit.Owing to not storing any decoded in error data that can destroy the information receiving before this in mobile unit, and mobile unit monitors DPTRCH always, and this is a good result to a certain extent.
When mobile unit receives DPTRCH frame and/or decode (804) (probability is P mistakenly 1), and the error detection verification in DPTRCH frame fails to detect mistake (818) in the DPTRCH frame that is not correctly received and/or decodes, and (probability is P 1p m1), and the DPTRCH frame the non-NULL frame (822) that are not correctly received and/or decode, mobile unit is decoded (826) to SHCCH frame mistakenly, and this frame is to be received and/or the DPTRCH frame of demodulation identifies by mistake that (probability is P by mistake 1p m1).When the error detection verification of SHCCH data of decoding detects, in the SHCCH data of decoding, there are wrong (828) (probability is P 1p m1(1-P m2)), ignore SHCCH frame (830), so just obtained to a certain extent good result.When the mobile unit SHCCH frame (826) of decoding mistakenly, and the error detection verification of the SHCCH data of decoding is failed to detect and in the SHCCH data of decoding, is had wrong (828) (probability is P 1p m1pM 2), mobile radio station carries out wrong decoding according to the SHCCH data of decoded in error to SHCH data, and this process is as mentioned above.Mobile radio station storage is by the SHCH data of decoded in error, and the SHCH data of storage and the data that receive are before this combined, and to the data after combination jointly decode (832).Because the SHCH data of decoded in error can destroy the decoding of the data to receiving before this, this is very bad result.
The result of the hope of flow chart 800 illustrated in fig. 8 comprises successful DPTRCH decoding and successfully SHCCH decoding.For DPTRCH decoding, the result of hope is that logic flow comprises that piece " does not have DPTRCH decoding error " (804), and corrects the decoding (806,808,810) of the SHCCH frame of wanting.Undesirable result is to comprise that piece " ignores DPTRCH " (820), and " SHCCH of decoding error " (826).It is important when in single user state during in state of activation at mobile unit " to ignore DPTRCH ", because lost frame throughput.If result " decoding error SHCCH " (826) causes " combination and decoding error data " (832) result, may destroy receiver buffer.
For SHCCH decoding, the result of hope is " combination and decoded data " (810).The result of this hope only can occur afterwards obtaining " SHCCH that decoding is wanted " (806) from DPTRCH (802,804).Undesirable result of corresponding blocks " SHCCH that decoding is wanted " (806) is " ignoring SHCCH " (814) (lost frames throughput) and " combination and decoding error data " (816) (may destroy receiver buffer).According to probability,
P{ does not have DPTRCH decoding error } SHCCH}=1-P that wants of=P{ decoding 1
P{ ignores DPTRCH}=(1-P m1)
The SHCCH}=P of P{ decoding error 1p m1, and
P{ does not have DPTRCH decoding error }+P{ ignores the SHCCH}=1 of DPTRCH}+P{ decoding error.
The SHCCH} that expansion P{ decoding is wanted,
The SHCCH that P{ decoding is wanted, combination and decoded data }=(1-P 1) (1-P 2),
The SHCCH that P{ decoding is wanted, ignores SHCCH}=(1-P 1) (P 2) (1-P m2),
The SHCCH that P{ decoding is wanted, combination and decoding error data }=(1-P 1) (P 2) (P m2).
Expansion P{ decoding error SHCCH},
P{ decoding error SHCCH, ignores SHCCH}=P 1p m1(1-P m2),
P{ decoding error SHCCH, combination and decoding error data }=P 1p m1p m2.
As Fig. 6, shown in 7 and 8, the mobile unit of the data that receive when decoding obtains undesirable result " combination and decoding error data " (618,718,816,832), time, mobile unit can finish the SHCH data of combination and decoding error, namely want the SHCH data for different mobile units, or can decode improperly and want the SHCH data for mobile unit.By HARQ error control, undertaken in the communication system of EDC error detection and correction, to wanting, for the decoding of the SHCH data of different mobile units or to wanting, for the incorrect decoding of the SHCH data of mobile unit, can bring throughput problem.
In the art, ARQ and HARQ error control are known.In ARQ communication system, by received communication device request, retransmit the incorrect data block receiving and guarantee correctly to transmit data.Repeat requests can be based on ACK or NACK.By using HARQ system, can obtain larger throughput or error performance.The similarity of HARQ system and ARQ system is that received communication device request retransmits all data blocks that received mistakenly.Yet HARQ is by preserving at received communication equipment place and improving coding gain by the data block that data block of makeing mistakes receives mistakenly and improve standard A RQ method.The data block of makeing mistakes is combined with the current data block receiving and together with decode, to improve performance.
In utilizing the communication system of HARQ error correction, as the decode rate of received communication equipment mistake in using or the modulation scheme SHCH that decodes improperly, or when wanting the SHCH decoding data for another communication equipment, received communication equipment is determined the data that received mistakenly, and these data of request retransmission.Received communication equipment is also stored in the data of decoding in harq buffer device.When received communication equipment receives the data of re-transmission, communication equipment combines the data of the data of re-transmission and buffering, and separates together the data of code combination.
When received communication equipment communicates among session with transmitting communication equipment, and inadvertently by from different communication session, while wanting to have carried out storage for the data of different communication equipments, or during improperly as mentioned above to decoding data, the data of storage can destroy all data of previously having received and with its combination and together with the data of decoding.To retransmitting to be correctly decoded, become very difficult, may cause launching communication equipment data retransmission repeatedly, until reach predetermined maximum retransmit number (" MAX_RETRIES ").When the chance that data are correctly decoded is very little, data retransmission is repeatedly wasted throughput exactly.In order to improve the data throughout of the system of using ARQ or HARQ error correction, communication system 100 comprises for preventing that the data block of appropriate decoding from destroying the method and apparatus of the data block of first pre-treatment.
Referring now to having illustrated in Fig. 9 and 10, figure, be a flow process of " refresh testing " embodiment according to one embodiment of present invention, make communication system 100, preferably the processor 114 of mobile unit 104 increases the throughput of the data of re-emissioning." refresh testing " provides by the processor 114 of mobile unit 104 and gives up the current control data that receive such as one in DPTRCH frame or SHCCH frame or the SHCH data of having stored, make the SHCH data of current reception not destroy the SHCH data of having stored or the SHCH data corruption of not stored, the SHCH data of described current reception are that the control data based on current reception are carried out demodulation code.
In an embodiment of refresh testing, when the control data in current reception there are differences between such as the DPTRCH frame previously having received or SHCCH frame as DPTRCH frame or SHCCH frame and the control data that previously received and stored, mobile unit, preferably the control data of the current reception of processor 114 hypothesis are wrong, and before Retransmission control data and SHCH data, ignore the current control data that receive.Preferably, at the current control frame receiving, be different from when being stored in storage 116 or being included in a plurality of control frame previously having received in the memory in processing 114, the current control data that receive of mobile unit 104 hypothesis are wrong.By ignoring the current control data that receive, the current SHCH data block receiving that mobile unit 104 prevents from being decoded irrelevantly according to the current control data that receive is destroyed SHCH data block in the harq buffer device that is stored in memory 116, that previously received and appropriate decoding.
In another embodiment of the present invention, when store discrepancy between the current control data that receive and the control data that previously received, mobile unit 104, be preferably processor 114 and suppose that the SHCH data of having stored are by demodulation or decoding irrelevantly, and before retransmitting the predetermined maximum times of SHCH data, remove the SHCH data in the harq buffer device in memory 116.Preferably, when the current control frame receiving is only different from the control frame previously having received being stored in the memory that memory 116 or processor 114 comprise, the SHCH data that mobile unit 104 hypothesis has been stored are by demodulation or decoding irrelevantly the corresponding control frame of mistake (that is, due to).In this embodiment, due to hypothesis when there are differences, will remove harq buffer device, can by the current control frame receiving only with the control frame comparison previously having received.By removing harq buffer device, the current SHCH data block receiving of appropriate decoding is destroyed SHCH data block that can previously do not received and not appropriate decoding.
In order to prevent the SHCH data block of the appropriate decoding of SHCH data block destruction of not appropriate decoding, before combination and decoding SHCH data, by mobile unit 104, preferably by processor 114 execution refresh testings.Namely, at logic flow square frame 600,700, and in 800, four possible results have been described: mobile unit 104 remains on single user state (610,706,824), mobile unit 104 is ignored SHCCH (616,716,814,830), mobile unit 104 is ignored DPTRCH (606,710,820), and mobile unit 104 according to the SHCCH data SHCH data (618,718 that combine and decode of decoding, 810,816,832).In refresh testing embodiment of the present invention, mobile unit 104 actuating logic flow processs 600,700, with 800 revision, wherein, mobile unit 104 is according to the SHCCH (618 of decoding, 706,718,810,816,832) combine and the SHCH data of decoding before, carry out refresh testing (902,904,1004,1008)." refresh testing " provides by the processor 114 of mobile unit 104 and ignored the current control data that receive (such as the current DPTRCH frame receiving or SHCCH frame), or before the predetermined maximum times of data retransmission, remove the SHCH data in the harq buffer device in the memory 116 that is stored in mobile unit by processor 114.By ignoring the control data of current reception or removing the SHCH data of the previous reception in buffer, prevented that the data block of incorrect decoding from destroying appropriate data block of decoding.
Fig. 9 is logical flow chart 900 according to an embodiment of the invention, and it has to be carried out to decode by the mobile unit 104 in state of activation wants for the SHCCH of mobile unit and the step of decoding SHCH data.Logic flow 900 is revisions of logic flow 800, provides in combination and decoding SHCH data (810,816) and has carried out before " refresh testing " (902,904).As shown in Figure 9, when in state of activation, mobile unit 104 is received and is wanted the DPTRCH frame 200,300 for mobile unit by DPTRCH 107, and this frame (802) of decoding.This flow process hypothesis DPTRCH frame wishes mobile unit 104 to point to SHCCH such as the SHCCH 108 that is assigned to mobile unit.When mobile unit is correctly decoded DPTRCH frame (804), the mobile unit 102 SHCCH frame of decoding rightly, such as the SHCCH frame 400 being identified by DPTRCH in SHCCH and be assigned to this mobile unit.
When mobile unit 104 is correctly decoded SHCCH frame (808), mobile unit is carried out refresh testing (902).By carrying out refresh testing, mobile unit 102 has avoided being destroyed respectively by the SHCH data of the SHCH data that receive or storage the SHCH data of storing SHCH data or receiving of appropriate decoding, namely avoided modulation scheme or the wrong code check of mistake in using irrelevantly to decode, or the data in the SHCH frame of decoding error.Refresh testing comprises: determine whether the data in the SHCCH frame of decoding are different from the SHCCH data that previously received, and the SHCCH data that wherein previously received are stored in the memory 116 of mobile unit 104.In an embodiment of refresh testing, when the data in the SHCCH frame in decoding are different from the SHCCH data that previously received, mobile unit 104 (preferably processor 114) supposes that the SHCH data with storage that previously received are destroyed, and removes the harq buffer device of memory 116.In another embodiment of refresh testing, when the data in the SHCCH frame in decoding are different from each in a plurality of SHCCH data that previously received, mobile unit 104 (preferably processor 114) supposes that current that receive and the SHCCH frame of storage are wrong, and ignores the current SHCCH frame receiving.Data in the SHCCH frame of decoding are not while being different from the SHCCH data that previously received, and mobile unit 104 is according to the information in SHCCH frame decode SHCH data and the SHCH data of storage decoding.Then, mobile unit combines with the SHCH data that previously received by the SHCH data of having stored, and decode together (810).
When error detection that mobile unit 104 is decoded mistakenly SHCCH frame (808) and checked the SHCCH data of decoding does not detect the mistake (812) in the SHCCH data of decoding, mobile unit is carried out refresh testing (904).Similar with step (902), in an embodiment of refresh testing, mobile unit 104 determines whether the data in the SHCCH frame of decoding are different from the SHCCH data that previously received.Equally, in one embodiment of the invention, when the data in the SHCCH frame in decoding are different from the SHCCH data that previously received, mobile unit 104 (preferably processor 114) is removed the harq buffer device in memory 116.Equally, in bright another embodiment of refresh testing, when the data in the SHCCH frame in decoding are different from each in a plurality of SHCCH data that previously received, mobile unit 104 (preferably processor 114) supposes that current that receive and the SHCCH frame of decoding are wrong, and ignores the current SHCCH frame receiving.By give up (dispense with) current SHCCH frame receiving and previously received, be stored in the data in harq buffer device, mobile unit 104 has been avoided carry out step 816, and avoids destroying by the SHCH data that receive incorrect decoding or incorrect the SHCH data of appropriate decoding.
Figure 10 is flow chart 1000 according to an embodiment of the invention, and it has to be carried out to decode by mobile unit 104 wants for the SHCCH of mobile unit rather than the step of mobile unit and decoding SHCH data.Logical flow chart 1000 is logic flow 600,700, each the revision of 800 kind, and wherein, mobile unit is carried out " refresh testing " (1004,1008) before in combination and decoded data (1006,618,718,832).As shown in figure 10, the SHCCH for mobile unit rather than mobile unit 104 is wanted in mobile unit 104 decodings.For example, mobile unit 104 may be being wanted DPTRCH for mobile unit rather than the mobile unit 104 DPTRCH frame of having decoded, and wherein, DPTRCH frame points to mobile unit 104 to want the SHCCH for other mobile unit.Utilize another example, the mobile unit 104 DPTCH frame of may having decoded improperly, causes the SHCCH of mobile unit 104 decoding errors.
When SHCCH frame that mobile unit 104 has correctly been decoded wrong (1002), mobile unit is carried out refresh testing (1004).As above describe in detail, mobile unit 104 determines whether the data in the SHCCH frame of decoding are different from and had previously received one or more SHCCH data, and the wherein said SHCCH data that previously received are stored in the memory 116 of mobile unit 104.In one embodiment of the invention, by the SHCCH frame of decoding and the SHCCH frame comparison previously having received, and when described frame is different, mobile unit 104 (preferably processor 114) supposes that the SHCH data with storage that previously received are destroyed, and removes the harq buffer device of memory 116.In another embodiment of the present invention, data in the SHCCH frame in decoding are by each in a plurality of SHCCH data with previously having received relatively and when not identical, mobile unit 104 (preferably processor 114) supposes that current that receive and the SHCCH frame of decoding are wrong, and ignores the current SHCCH frame receiving.When the data in the SHCCH frame of decoding are different from the SHCCH data that previously received, mobile unit 104 (preferably processor 114) is removed the harq buffer device in memory 116, thereby avoid carry out step 1006, and avoid destroying by the incorrect or incorrect current data receiving the data that previously received.
When error detection that mobile unit 104 is decoded mistakenly SHCCH frame (1002) and checked the SHCCH data of decoding does not detect the mistake (614,714,828) in the SHCCH data of decoding, mobile unit is carried out refresh testing (1008).Similar with step (1004), in an embodiment of refresh testing, by the SHCCH frame of decoding and the SHCCH frame comparison previously having received, when these frames are different, mobile unit 104 (preferably processor 114) supposes that the SHCH data that previously received He stored are destroyed, and removes the harq buffer device in memory 116.In bright another embodiment of refresh testing, when the data in the SHCCH frame of decoding being compared from each in a plurality of SHCCH data that previously received and when different, mobile unit 104 (preferably processor 114) supposes that current that receive and the SHCCH frame of decoding are wrong, and ignores the current SHCCH frame receiving.By abandon the current SHCCH frame receiving and previously received, be stored in the data in harq buffer device, mobile unit 104 has been avoided carry out step 618,718, and 832, and avoid destroying by the incorrect or incorrect current data receiving the data that previously received.
In an embodiment of refresh testing, if the SHCCH information of decoding is different from the previous SHCCH in the inconsistent method of the agreement with causing protocol error, the harq buffer device that processor 114 is removed in memory.Each protocol error represents one " refresh testing ".The purge mechanism (not being test itself) that is used for removing buffer is identical when receiving the new sequence number that is used for new grouping after successfully transmitting or abandoning (maximum retry) previous grouping.This will make the loss of throughput of hopeless retry minimum, and each in described hopeless retry is by the buffer in combination with a destruction.With respect to the example of the protocol error of field, at 1XTREMEMAC Outline, in the F-SHCCH in 9C version, define, as follows:
1) change for No. SN, but ABI does not change.
2) MCSL changes from attempt for the first time, for example, and MCSL=1 in attempting for the first time, MCSL=4 in attempting for the second time; MCSL 1≠ MCSL 2.
3) there is change in the sum of walsh code.Especially, the difference between field LC and BC, (LC 1-BC 1) ≠ (LC 2-BC 2).
4) change for No. SR_ID
5) change for No. SEQ_UN.
6) AI receiving represents the figure that unallowed ARQ example repeats.For example, 1XTREME does not allow two successive frames that are transmitted into identical mobile radio station to carry identical ARQ example.
As mentioned above, just in time at " combination and decoded data " and " combination and decoding error data " piece (receiver can not be informed that combination of execution and decoding) of Fig. 9 and Figure 10 explanation, before, carry out " refresh testing ".When there is " combination and decoded data ", " refresh testing " tool effect likely; But unfortunately,, when there is " combination and decoding error data ", may abandon acceptable data.
Although the refresh testing of introducing is above included between present frame and the frame of previously activation and compares, in other embodiment of refresh testing, can be by the frame comparison of present frame and a plurality of previous activation, as long as all these frames seem to have same packets.Thereby customizable a kind of voting method, makes receiver move to respond refresh testing according to the current frames that cushioned how many activation.For example, while only having an Active Frame in the harq buffer device at memory 116, processor 114 must determine whether that frame that new frame has been or buffering is good.In this case, " refresh testing " no matter when detected, processor 114 all abandons harq buffer device data as mentioned above.When in the situation that have the frame of two or more activation in harq buffer device and protocol error do not occur, the frame of described two or more activation can represent that harq buffer device comprises active data, and current discontinuous SHCCH frame represents wrong control information.Therefore, receiver should be ignored present frame, and data are remained in harq buffer device.
Referring now to having introduced in Figure 11 and 12, figure, be the flow process of " energy detector test " according to another embodiment of the invention, wherein communication system (being preferably the processor 114 of mobile unit 104) has increased the throughput in ARQ and HARQ system.Energy detector test is that hypothesis is carried out by the colour of long code scramble mask.Due to Long Code Mask for given user namely given mobile unit 104 be unique, if DPTRCH frame or SHCCH frame are decoded according to a walsh code that is different from the walsh code for the information in frame is encoded, the energy receiving will be low.Under the conditions without departing from the spirit and scope of the present invention, at this, can use other the colour mechanism that identical energy attribute (producing similar energy value) is provided.
Figure 11 is logical flow chart 1100 according to an embodiment of the invention, and it has the step of being carried out in carrying out energy detector test by mobile unit 104.After logic flow starts, the processor 114 of mobile unit 104 calculates the energy metric of the control frame for receiving, such as the energy of the data field for DPTRCH frame or DPTRCH frame or for the energy of the data field of SHCCH frame or SHCCH frame, preferably, this calculating is to be undertaken by calculating the energy of the data field of corresponding frame.Then, processor 114 compares to produce comparative result (1104) by energy metric and energy threshold.Energy threshold is designed to a designator, and whether it points out irrelevantly or reception improperly, demodulation or decoding control frame.According to comparative result, processor 104 determines whether to ignore the frame (1106) receiving, preferably according to the control frame that receives another frame (1108) of decoding, as the SHCCH frame of decoding according to DPTRCH frame, maybe when the energy metric clearing out is greater than energy threshold according to the SHCCH frame SHCH frame of decoding, and when the energy metric calculating is less than energy threshold, ignore the control frame (1110) receiving.
In one embodiment of the invention, processor 114 for example, by by the position in corresponding frame or data, field (, pointer bit field on DPTRCH) chip despreading becomes code element, and by the summed square of the homophase of code element and quadrature phase component, thereby calculated data field energy.Processor 114 can be by the frame energy calculating (for example, the energy " Eptr " of the pointer bit field on corresponding DPTRCH) compare to determine channel reliability with threshold value, wherein, energy level can represent noisy, insecure channel lower than threshold value, and should ignore described frame.Equally, can will compare and help determine which frame the most reliably and should decode for a frame energy (N), that calculate and the energy about the frame (N+1) that receives subsequently calculating by processor 114.Like this, the energy calculating of each frame threshold value of another frame that is used as determining whether decoding.In comparing frame (N+1) and frame (N), processor 114 is preferably ignored the frame with less energy, and it may be offset border.
In another embodiment of the present invention, processor 114 can calculate relevant measuring, because utilize DPTRCH, power control bits/pre-determined bit (reserve bit) field is always sent out, and pointer position may always not be sent out (that is, may be sent intermittently (DTX ' d)).Processor can calculate for the energy of power control bits/pre-determined bit field " Epcb " with for the energy " Eptr " of pointer field.Then, processor 114 is determined relevant energy metric " Eptr/Epcb ", and relevant energy metric and the threshold value being stored in memory 116 are compared, to determine channel (DPTRCH) reliability of relative pointer position.For example, when Eptr/Epcb is greater than threshold value, tolerance surpasses threshold value, shows that channel is reliable, and when Eptr/Epcb is more much smaller than threshold value, tolerance does not reach threshold value, shows that channel is unreliable.In another embodiment of the present invention, processor 114 can calculate " Eshcch/Epcb " (wherein, Eshcch is the energy calculated value of corresponding SHCCH frame), and/or the calculation of correlation between two or more frame periods relatively, wherein, a tolerance adds that some borders can be used as for determining the threshold value of the reliability of another frame.Namely, while being greater than scheduled volume when relative another tolerance variation of tolerance, can determine that in two frames is insecure.
For example, in another embodiment of energy detector test, processor 114 (for example, threshold_1) compares the despreading energy of DPTRCH frame and the first energy threshold being stored in memory 116.When DPTRCH expansion energy does not reach threshold_1, while being less than threshold_1, processor " is ignored DPTRCH " (or equivalent processes).In another energy detector test, processor 114 (for example, threshold_2) compares the despreading energy of SHCCH frame and the second energy threshold being stored in memory 116.When SHCCH expansion energy does not reach threshold_2, while being less than threshold_2, mobile unit " remains special-purpose " (or equivalent processes).In the embodiment of another energy detector test, processor 114 compares the despreading energy of the despreading energy of DPTRCH frame and SHCCH frame.Difference between DPTRCH and SHCCH expansion energy does not reach the 3rd energy threshold, (for example surpass the 3rd energy threshold be stored in memory 116, in the time of threshold_3) (, when the absolute value of described difference is greater than threshold_3), processor can " be ignored DPTRCH " or " remaining special-purpose " (or equivalent processes).
Referring now to Fig. 6,, 7,8,11, with 12, the decoding DPTRCH (602,702 that can just in time introduce in the above in other embodiments of the invention,, 802) i.e. decoding is wanted to want the SHCCH (612 for the mobile unit except mobile unit 104 for SHCCH (806) and the decoding of mobile unit 104,712,826) before any one or more steps in, while carrying out energy detector side (1202).For example, Figure 12 be according to another embodiment of the invention, comprise logical flow chart 600,700, logic flow Figure 12 of the part combination of each in 800, wherein, logical flow chart 600,700, each logical flow chart in 800 is modified to be provided for to carry out energy detectors by mobile unit 104 and tests.As shown in figure 12, before each that can be in decoding DPTRCH frame (602,702,802) and decoding SHCCH frame (612,712,806,826), use energy detector to test.When mobile unit 104 (can help the little or non-existing CRC of compensation to DPTRCH) while being no longer special-purpose, when wanting decoding to want the SHCCH for the mobile unit except mobile unit 104 when mobile unit (612,712,826), energy detector test is particularly useful.Therefore, energy detector test is supplementing " refresh testing ", because energy detector test allows mobile unit to ignore DPTRCH (606,710,820,1204), and avoided decoding to want the SHCCH for the mobile unit except mobile unit 104, rather than refresh buffer unnecessarily.
In another embodiment of the present invention, communication system 100 (being preferably the processor 114 of mobile unit 104) can be carried out the combination of energy detector test and refresh testing, i.e. hybrid test.Hybrid test is as the refresh testing, find for the consistency between a plurality of control frames of given grouping (or transmitter unit), but use energy metric to help determine whether ignore present frame or refresh previous frame when generation is inconsistent, and keep new frame.In another embodiment of the present invention, hybrid test also can combine with single refresh testing and/or energy test.
For example, suppose that two SHCCH frame N and N+1 are decoded by processor 114, do not detect mistake.And, suppose the energy of " Eshcch (N) " representative in SHCCH frame N, also the energy of hypothesis " Eshcch (N+1) " representative in SHCCH frame N+1, preferably carries out energy by processor 114 and determines.So, if not identical/consistent with the SHCCH field of SHCCH frame N+1 from SHCCH frame N, but SHCCH frame N and SHCCH frame N+1 seem still corresponding identical packet, processor 114 is carried out SHCCH energy test.
SHCCH energy test is as follows: if Eshcch (N) > (Eshcch (N+1)+border, (a) ignore current SHCCH or, (b) from frame N, select SHCCH information, otherwise (that is, when Eshcch (N)≤Eshcch (N+1)+border) selects SHCCH information from frame N+1.If select N+1, refresh soft decision buffer, and carry out initialization by the soft decision information of SHCH.
The same with refresh testing, hybrid test can be expanded to corresponding same packets more than on two control frames.For example, suppose that processor 114 determines that the information being included in SHCCH frame N+2 is inconsistent with SHCCH frame/information of selecting according to above-mentioned SHCCH energy test, but with for not having the SHCCH information of selecteed frame consistent.So, processor 114 refreshes current soft decision buffer, and reinitializes by the soft decision information of N+2 SHCH.Processor 114 also supposes that N+1 SHCCH information is the correct information of re-emissioning subsequently for all, and uses N+1 SHCCH information as for testing the reference with the SHCCH frame of reprocessing.Then, processor 114 does not use the SHCCH frame in future that correspondence utilizes inconsistent information (with respect to reference) to re-emission.
In another embodiment of the present invention, hybrid test can comprise correlation ratio.For example, for example, for example, when the field (, pointer field, or pntr) that DPTRCH frame comprises the field (power control bits, or pcb) being always sent out and is only being sent out when mobile unit 104 is receiving SHCCH, correlation energy is relatively possible.That is, processor 114 is determined the energy (Eptr) of pointer field and the energy (Epcb) of power control bits.Processor 114 (for example) comes comparison Eptr and Epcb by definite Eptr/Epcb ratio, and array field energy comparison value and the compare threshold being stored in memory 116 are compared to (for example, comparing Eptr/Epcb and threshold_4).Then, the comparative result that processor 114 is placed in compare threshold according to data field energy comparison determines whether to ignore frame or decoded frame.
For example, suppose that Eptr/Epcb is less than threshold_4.So, processor 114 can determine to ignore DPTRCH, the SHCCH that do not decode, and the data channel (SHCH) of the current shared of not decoding.Processor 114 can also be carried out this energy inspection of relative SHCCH, wherein, by the energy of SHCH frame (Eshch), to the ratio of Epcb, is that Eshch/Epcb is that threshold_5 compares with another compare threshold being stored in memory 116.When Eshch/Epcb is less than threshold_5, processor 114 does not use SHCCH information, and the data channel (SHCH) of the current shared of not decoding.Processor 114 also may by the fixed ratio Eptr/Epcb (N) for frame period N with for the fixed Eptr/Epcb (N+1) of frame period N+1, compare, and determine which SHCCH channel is correct while there is inconsistent bit field between supposition N and N+1 frame.For example, if Eprt/Epcb (N) < Eptr/Epcb (N+1), processor 114 can determine to keep the SHCCH information from frame period N+1, otherwise keeps the SHCCH information from frame period N.
Except the embodiments of the invention of introducing above, other embodiments of the invention can comprise one or more in following situation:
1. should be with asking mobile unit 104 to check at least two DPTRCH frames before entering sleep.
2. as to long code scramble/painted replacement, can carry out with the UID of corresponding mobile unit 104 CRC of painted SHCCH frame.This will greatly reduce the probability of the SHCCH of another mobile unit of misinterpret.[P 1p m1(1-P 2) → P 1p m1(1-P 2) P m2], the broadcast UID that also may have to have of all mobile units in communication system 100.
3. do not use paintedly, suppose P 1≈ P 2, and P m1≈ P m2, combination and the probability of decoding error data are by following domination (a) SHCCH of decoding error correctly, and the SHCCH that (b) decoding is wanted improperly.Because two quite symmetrical, the SHCCH of usining makes (effect) that DPTRCH obtains more by force seldom as cost, and vice versa.For the error detection on DPTRCH and SHCCH, be also identical.
Although illustrate and introduced the present invention with reference to specific embodiment, it should be understood by one skilled in the art that in the situation that not deviating from the spirit and scope of the present invention, can carry out various changes and replace the wherein equivalent variations of parts.In addition,, in the situation that not deviating from the spirit and scope of the present invention, can carry out a lot of materials that adapt to specific situation or instruction of the present invention of revising.Therefore, wish that the present invention is limited by specific embodiment disclosed herein, the present invention is by all embodiment that comprise in the scope that drops on claims.

Claims (14)

1. for receive a method for data at wireless communication system, the method comprising the steps of:
The energy calculating of the frame of the shared control channel data that are identified for receiving;
The energy calculating and the threshold value of determined described frame are compared;
The energy calculating of the energy calculating of determined described frame and frame is subsequently compared; And
When described in frame subsequently described in the determined energy calculating for described frame is greater than, calculate energy time, frame subsequently described in ignoring; And
When described in frame subsequently described in the determined energy calculating for described frame is less than, calculate energy time, ignore described frame.
2. the method for claim 1, wherein determines that the step of the energy calculating comprises the following steps: calculate the energy corresponding with the data field of described frame.
3. method as claimed in claim 2, further comprise: by shared control channel, receive shared control channel data, wherein said shared control channel is dedicated pointer control channel, and wherein said data field comprises the pointer bit field of the frame receiving by described dedicated pointer control channel.
4. the method for claim 1, further comprise: by shared control channel, receive shared control channel data, wherein said shared control channel is dedicated pointer control channel, the described frame wherein receiving by described dedicated pointer control channel has a plurality of data fields, and wherein determines that the step of the energy calculating comprises the following steps:
Determine the second energy level of the second data field in the first energy level of the first data field in described a plurality of data field and described a plurality of data field; And
More described the first energy level and described the second energy level, measure with produce power.
5. method as claimed in claim 4, wherein, described the first data field is power control bits field, and described the second data field is pointer bit field.
6. the method for claim 1, further comprises:
By shared control channel, receive described shared control channel data;
By dedicated pointer control channel, receive dedicated pointer control channel data; And
Wherein, the step that is identified for the energy calculating of the data that receive comprises the following steps:
Determine with described in corresponding the first energy level of the shared control channel data that receive;
Determine with described in corresponding the second energy level of the dedicated pointer control channel data that receive;
More described the first energy level and described the second energy level, measure with produce power; And
Wherein, described in ignoring, frame subsequently and the step of ignoring described frame comprise the following steps: when described energy metric does not reach described threshold value, ignore described dedicated pointer control channel data.
7. method as claimed in claim 6, further comprises: when described energy metric does not reach described threshold value, stop by least one decoding data receiving in described shared control channel and described shared channel.
8. the method for claim 1, wherein said method is further comprising the steps: by shared control channel, receive described shared control channel data, and the step of the tolerance of the energy that the shared control channel data that wherein, are identified for receiving calculate comprises the following steps:
Determine with described in corresponding the first energy level of the shared control channel data that receive;
Determine with described in corresponding the second energy level of the shared channel data that receive;
More described the first energy level and described the second energy level, measure with produce power; And
Wherein, the step of ignoring described in comprises the following steps: when described energy metric does not reach described threshold value, ignore described shared control channel data.
9. method as claimed in claim 8, further comprising the steps: when described energy metric does not reach described threshold value, to stop the decoding data to receiving by described shared control channel.
10. for receive a communication equipment for data at wireless communication system, described communication equipment comprises:
Device for the energy calculating of the frame of the shared control channel data that are identified for receiving;
For the device that the energy calculating and the threshold value of determined described frame are compared;
For the device that the energy calculating of the energy calculating of determined described frame and frame is subsequently compared;
During for energy when calculating described in frame subsequently described in the energy calculating of determined described frame is greater than, the device of frame subsequently described in ignoring; And
During for energy when calculating described in frame subsequently described in the energy calculating of determined described frame is less than, ignore the device of described frame.
11. communication equipments as claimed in claim 10, the device of the wherein said energy calculating for the shared control channel data that are identified for receiving comprises: for determine with described in the device of corresponding the first energy level of the shared control channel data that receive, and further comprise for determine with described in the device of corresponding the second energy level of the dedicated pointer control channel data that receive, be used for more described the first energy level and described the second energy level with the device of produce power tolerance, and for ignore the device of described dedicated pointer control channel data when described energy metric does not reach described threshold value.
12. communication equipments as claimed in claim 11, wherein further comprise: for stop the device to the decoding data of at least one reception by described shared control channel and described shared channel when described energy metric does not reach described threshold value.
13. communication equipments as claimed in claim 10, wherein said for determining that the device of the energy calculate comprises: for determine with described in the device of corresponding the first energy level of the shared control channel data that receive; For determine with described in the device of corresponding the second energy level of the shared channel data that receive; Be used for more described the first energy level and described the second energy level with the device of produce power tolerance; And described communication equipment further comprises for ignore the device of described shared control channel data when described energy metric does not reach described threshold value.
14. communication equipments as claimed in claim 13, further comprise: for stop the device of the decoding data to receiving by described shared control channel when described energy metric does not reach described threshold value.
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