CN2788494Y - Customer device - Google Patents

Abstract

The utility model relates to a user facility for receiving data of a transmission block group, which sends a transmitting block group through self-adaptive modulation and coding. The user facility uses a mixed automatic repeat request device of a physical layer. The user facility comprises a receiver which is coupled with an antenna, and the receiver receives a transmission block group and determines whether the received transmission block group is in conformity with specific quality. The receiver receives segmented transmission block groups in the subsequent transmission. Transmitted segments use a modulation and coding group which is different from the transmission block group, and at least two segments are respectively transmitted. A mixed automatic repeat request decoder is coupled with the receiver, and whether each received transmission block group and each segment are in conformity with specific quality is determined. When the transmission block groups and the segments are not in conformity with specific quality, an automatic repeat request transmitter transmits a repeat request.

Description

Subscriber equipment

Technical field

The utility model relates generally to wireless communication system.Especially, the utility model relates to the transfer of data in such system, has wherein used adaptive modulation and coding (AMC) and mixed automatic repeat request (H-ARQ) technology.

Background technology

In wireless communication system, such as Frequency Division Duplexing (FDD) (FDD) communication system of third generation partner plan (3GPP) time division duplex (TDD) or employing code division multiple access (CDMA), perhaps orthogonal frequency-division (OFDM) system, AMC is used to optimize the utilization of air resource.

The modulation and the encoding scheme (setting) that are used to send data change based on wireless channel conditions.For example, the type (such as turbo versus convolutional encoding) of a data coding, encoding rate, be used for cdma system spreading factor, modulation type (such as quadriphase PSK M-ary phase shift keying contrast M-ary quadrature amplitude modulation modulation), and/or the many subcarriers that are used for an ofdm system can change.If the characteristic of channel improves, lower data redundancy and/or " less reliability " modulation and encoding setting are used to transmit data.As a result of, for a given wireless resource allocation, the more user data that is transmitted causes the data transfer rate of a higher effective.On the contrary, if the characteristic of channel reduces, one higher data is redundant and/or " more reliable " modulates and encoding setting is used, and transmits less user data.Use AMC, an optimization between the utilization of resources aloft and the service quality (QOS) can better be kept.

Data in such system are received transmission through air interface in Transmission Time Interval (TTI).The interior data of a TTI that are sent to special user's equipment are known as a transmission block group.For the distribution of a special air resource, less reliability modulation and code set allow bigger TBS size, and more reliability is modulated and code set only allows less TBS size.As a result of, be used for the full-size that the modulation of a given allocation of radio resources and code set are defined in the TBS that a given TTI can be supported.

In this system, a kind of mixing repeats (H-ARQ) request unit automatically and can be used to keep QOS and improve radio resource efficiency.Use the system of H-ARQ to be displayed among Fig. 1.A transmitter 20 uses special modulation and code set through TBS of air interface transmission.Receive this TBS by a receiver 26.The TBS that 30 decodings of H-ARQ decoder receive.If the quality of the data that receive is unacceptable, TBS is retransmitted in one of ARQ transmitter 28 request.A kind of method of checking the quality of the TBS that receives is CRC (CRC).An ARQ receiver 22 receives request and makes the repeating transmission of TBS by transmitter 20.For increasing the probability that success is transported, repeating transmission can be used the modulation and the code set of reliability more.90 combinations of H-ARQ decoder, the TBS version of reception.A demand that is used to make up is that the TBS size that merges is consistent.If the quality of end product is inadequate all the time, another repeating transmission is requested.If the quality of end product is that then Zu He TBS checks by CRC fully, the TBS of reception is released and is used for further processing.The H-ARQ device allows the data of unacceptable reception can the retransmitted QOS that transports and keep expecting to assure success on a more reliable MCS.

Another kind method is to use old modulation and code set to retransmit TBS.Yet other is destroyed if channel condition regulation is used a more reliable modulation and code set or initial transmission, retransmits the combination of TBS and can not pass through again, causes a bust this.

In a system that uses H-ARQ and AMC, a change in modulation and the code set can be determined transporting with the success of the TBS repeating transmission that realizes a required request.In this case, the physical data bit of the maximum in the TTI allows to change with modulation and code set.

Because only there is a TBS in each TTI, be applied to each TTI corresponding to the effective user data rate of TBS size.For realizing maximum data rate, maximum TBS size is used to the modulation and the code set of the reliability of the minimum in the TTI.When wireless channel conditions required a bigger reliability modulation and code set to be used for successfully transmitting, such TBS size can not be supported in TTI.Therefore, when realizing a bigger reliability modulation and coding demand, all the uncompleted transmission during the H-ARQ with TBS size handles are not supported by this MCS, and the transmission of successfully not confirmed is abandoned at every turn.

In current implementation, when utilizing AMC and H-ARQ device can not successfully send a TBS, handle recovery by wireless link control (RLC) agreement (on layer two).A H-ARQ who is different from failed transmission recovers, the RLC error detection, and the buffering of a TBS queuing in data recovery and the node-b causes increasing transfer channel block error rate and transmission latency, and potential causing can not be satisfied the QOS requirement.

The utility model content

Therefore, the mode that expectation has a replacement in this system is recovered to allow to support high data transfer rate when unsuccessful transmission is used AMC and H-ARQ technology with box lunch.

For achieving the above object, the utility model provides a kind of subscriber equipment, and described subscriber equipment comprises:

One receiver, this receiver is coupled to an antenna, this receiver is used for receiving the transmission block group with one first modulation and coding and is used for having in transmission reception subsequently the transmission group section of one second modulation and coding, and this first modulation and coding are different from this second modulation and encode;

A mixed automatic repeat request decoder, it is coupled to described receiver, this mixed automatic repeat request decoder has the input that is used to receive this transmission block group and transmission block group section, be used to produce one first output whether a signal meets an extra fine quality with the transmission block group of indicating each reception and section, and one second output that is used to produce the data of this transmission block group; With

An automatic repetitive requests transmitter, it is coupled to described mixed automatic repeat request decoder and described antenna, and it has an input that is used to receive described signal and is used for the output that produces a repetitive requests in response to described signal.

Description of drawings

Fig. 1 is an embodiment of a wireless H-ARQ communication system.

Fig. 2 is the example of the TBS of a segmentation.

Fig. 3 A is an example with TBS of a segmentation of a control messages of transmission outside the band.

Fig. 3 B is the example of TBS with segmentation of segment identifier.

Fig. 3 C is an example with TBS of a segmentation of the segment identifier of transmission outside the band.

Fig. 4 is the example of TBS with segmentation of transfer sequence number.

Fig. 5 is an embodiment of the TBS wireless communication system of a segmentation.

Fig. 6 is the flow chart of a TBS of segmentation.

Fig. 7 is segmented into a TBS example of three sections.

Embodiment

In various wireless communication systems, can use the transmission block set of segmentation, such as FDD/CDMA, TDD/CDMA and ofdm communication system.

For supporting High Data Rate, big TBS size is applied to each TTI.For allowing to retransmit big TBS size, with transporting of assuring success, transmission provides segment information to TBS on more reliable modulation and code set.Fig. 2 example in a TTI, have a TBS of segment information (SI).Data in the TBS of example are segmented into a plurality of sections, and section 1 is to section N.Each section by sizeization so that have a data size can supporting a more reliable modulation and code set.Segment information (SI) and TBS data multiplex.Although segment information is shown as the stem among Fig. 2, can be positioned at any position (band) of TBS transmission structure when segment information.Segment information can be used to the segmentation of TBS.

Selectively, Fig. 3 A example use the control signaling to send segment information.Transmit control signal from segment data (band outer) on the channel of a separation, section 1 is to section N, (band is interior).The mode that is used for the segmentation TBS of the original TBS of reconstruct in the segment information indication receiver.

Fig. 3 B example use a segment identifier (SID) to be used as being with interior segment information.Each section 1 has a corresponding segment identifier to section N, and SID1-SID2 is with the data multiplex (in the band) of segmentation.Fig. 3 C example use a SID as the outer segment information of band.

Fig. 4 example be used for the preferred segment identifier of the TBS of a segmentation.Medium access controller (MAC) distributes a transmission sequence number (TSN) to each potential section.If TBS is by segmentation, the data of each section are relevant to the TSN of that section.As shown in Figure 4, each section has its TSN, TSN1-TSNN.In utilizing the wireless communication system of H-ARQ, TSN is assigned to the processing of each TBS with the permission order.Use TSN as a segment identifier, reduced required modification and minimized the additional complexity of the system that holds segmentation.

Fig. 5 is used for retransmitting the transmitter 44 of a TBS and a reduced graph of a receiver 46 with segmentation.Transmitter 44 can be positioned on a kind of subscriber equipment or the base station/node-b.Receiver 46 can be positioned on a base station/node-b or a kind of subscriber equipment.In current system realizes, be typically AMC and only be used for down link.Thereby at down link, the realization of preferred transmission block segmentation is used to support AMC.For other the system that uses AMC in up link, the transmission block segmentation can be applied to up link.

A transmitter 30 is through TBS of air interface 36 emissions.A receiver 38 receives the TBS of emission.The TBS of H-ARQ decoder 42 each reception of decoding.If TBS does not meet quality test, make a request that is used to retransmit by ARQ transmitter 40.An ARQ receiver 32 receives this request and also directly TBS is retransmitted.Make up the TBS that retransmits and carry out another quality test by H-ARQ decoder 42.In case TBS is by quality test, it is released and is used for further processing.

In addition, shown an AMC controller 34 among Fig. 5.If channel condition changes, AMC can start a change and be used to transmit data in modulation and code-group.Fig. 6 is a flow chart, example H-ARQ appear at a such change among the AMC between retransmitting.The TBS of an emission does not meet quality test and a repeating transmission is requested (step 50).In order to use Fig. 7 example, the transmission that TBS is launched and receives does not meet quality test, as directed one " X ".It is determined to a change of a better reliable modulation and code set and satisfies successful transmission, (step 52).Because need a more reliable modulation and code set, the repeating transmission of the TBS of same size can be impossible.The H-ARQ processing is reset and uses TBS staging device 46 segmentation TBS, (step 54).Typically, use physical layer segmentation, handle for the suitable operation H-ARQ that do not need to reset.Each section of the section of original TBS and subclass be with a size of new modulation and code set compatibility on.Use Fig. 7 example, original TBS is segmented into three sections, section 1, section 2 and section 3.On more reliable modulation and code set, retransmit all section, (step 56).

Each section of section or subclass use new modulation and code set to be retransmitted respectively.As shown in Figure 7, section 1, section 2 and section 3 are retransmitted respectively and are received.In addition, can also depend on modulation and coding selection, any subclass can be transmitted and received (section 1﹠amp respectively; Section 3, perhaps section 2﹠amp; Section 3, or the like).If a bust this of the subclass of weak point or section, that section that 40 requests of ARQ transmitter are all section or a repeating transmission of subclass.All section the section or the transmission or the repeating transmission of subclass are combined, till all section section or subclass are by quality test.

For reducing the overhead of the increase that requires by segment information, the regulation that node-b is selected when segmentation option is utilized.Be example, if channel condition is descending or estimated decline, segmentation option can be utilized.It is this that determine can be based on channel quality measurement, at the previous transmission success/mortality of specific modulation and code set, or other criterion.A segmentation controller 48, preferably in node-b, as shown in Figure 5, whether decision supports segmentation.Segmentation controller and MAC co-operation are so that add segment information among the TBS to.Segmentation decision can be based on various factors, such as cell load, and the user of increase, the previous number of retransmissions and the channel quality of measurement.

Claims (1)

1. subscriber equipment, it is characterized in that: described subscriber equipment comprises:

One receiver, this receiver is coupled to an antenna, this receiver is used for receiving the transmission block group with first modulation and coding and is used for having in transmission reception subsequently the transmission group section of second modulation and coding, and this first modulation and coding are different from this second modulation and encode;

A mixed automatic repeat request decoder, it is coupled to described receiver, this mixed automatic repeat request decoder comprises the input that is used to receive this transmission block group and transmission block group section, be used to produce one first output whether a signal meets an extra fine quality with the transmission block group of indicating each reception and section, and one second output that is used to produce the data of this transmission block group; With

An automatic repetitive requests transmitter, it is coupled to described mixed automatic repeat request decoder and described antenna, and it has an input that is used to receive described signal and is used for the output that produces a repetitive requests in response to described signal.

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