CN2857344Y - Device of correcting channel quality marking - Google Patents

Abstract

A device for correction of channel quality identification which includes: two channel estimation and route selectors, each channel estimation and route selector outputs a set of route reaction data; mod calculation circuit receiving route response data; squarer connected with the mod calculation circuit to receive data from the mod calculation circuit; two summation circuits each of which is connected with a set of squarer to receive data from the squarer; devision device, input end of which is connected with output end of the said two summation circuits; channel quality identification database to receiving data from the devision device and output channel quality identification. Carry out correction of CQI using the processing of HS-SCCHi+1 between HS-DSCHi and HS-SICHi and channel information obtained from the downwards accompanied DPCH, which can improve system throughout decrease resulted by non-real time property of CQI without additional complexity.

Description

The device of correction channel quality indication

Technical field

The utility model relates to a kind of device of correction channel quality indication.Relate in particular in the 1.28 megahertz time division duplex high speed descending grouping access systems, in the frequency division duplex system of three generations's partnership relation and the device of correction channel quality indication in the 3.84 megahertz time division duplex high speed downlink packet welding systems.

Background technology

From the R5 version of 3GPP (three generations's partnership relation) technical standard, HSDPA (high speed downlink packet access) as a kind of enhancement techniques of 3G mobile communication system formally by standardization.(1.28Mcps megahertz) TDD (time division duplex) HSDPA mainly adopted defeated, the short TTI of AMC (Adaptive Modulation and Coding), FCS (fast cell selection), multi-antenna transmitting (Transmission Time Interval) (5ms) and HARQ (mixing automatic repeat requests) wait some novel technology to improve the throughput (Throughput) of system.

AMC belongs to a kind of link adaptation techniques, its basic principle is exactly the transmission rate according to the channel situation self-adapted adjustment system, when signal to noise ratio when higher, adopt higher order of modulation and code rate, otherwise promptly adopt lower order of modulation and code rate.

The realization of AMC will face several challenges.The combination of at first, too much modulation, encoding scheme (MCS) can increase the complexity of system.In 3GPP technical standard 25.321, stipulated clearly that 1.28Mcps HSDPA only adopts QPSK (four phase shift keyings) and two kinds of modulation systems of 16QAM (quadrature amplitude modulation), and the access capability of UE (terminal) is divided into three classes, the transmission block size of each class in a TTI is defined as 64 kinds of selections, and this has reduced the complexity of system design effectively.Secondly, AMC is very responsive to the sum of errors time-delay of channel measurement.In order to select suitable modulation and code rate, the scheduling on upper strata must have accurately quality of channel to be understood.Otherwise might be because of having adopted too high modulation, code rate and cause frame error rate too high, or have adopted lower modulation, code rate and caused the loss of power system capacity.

According to standard, the physical layer procedures of Node (node) B can be described as in the 1.28Mcps HSDPA system:

Whether step 1, NodeB emission HS-SCCH (the special-purpose shared control channel of HS-DSCH) will receive corresponding HS-DSCH (high speed descending sharing channel) with notice UE, be at least three time slots at interval between first time slot of HS-SCCH and HS-DSCH, and HS-DSCH to be in same subframe or adjacent sub-frame with the HS-SCCH of correspondence.

Step 2, NodeB adopt the indicated physical resource emission HS-DSCH of HS-SCCH.

Step 3, when the HS-SICH that receives UE emission (the special-purpose information channel of sharing of HS-DSCH), status report ACK/NACK (affirmation/non-affirmation) and CQI (channel quality indication) are reported to high level.

According to standard, the physical layer procedures of UE end can be described as in the 1.28Mcps HSDPA system:

Step 1, after high level provides indication, UE should monitor HS-SCCHs set, and decoding HS-SCCH goes up entrained information.

If the information of carrying on step 2 HS-SCCH has been passed through the verification of CRC (cyclic redundancy check (CRC)), and UE ID that HS-SCCH carries and the identity of UE are consistent, UE should handle and the corresponding HS-DSCHs of HS-SCCH (high-speed physical downlink shared channel (HS-PDSCH)), otherwise the data that just abandon HS-SCCH and comprised continue to detect the HS-SCCH of next subframe.

Step 3, handled after the HS-DSCHs, UE handles the status report (ACK/NACK) of correctness by the HS-SICH emission about HS-DSCH and reflects the information CQI of physics transmission channel quality.Wherein CQI comprise HS-DSCH transmission the modulation system and the TFRI (transformat and resource information) that should adopt.

A HSDPA cycle that three steps of UE end physical layer procedures is called UE.Fig. 1 has described a common UE end HSDPA cyclic flow schematic diagram.

In 1.28Mcps HSDPA system, definite principle of CQI should be to have maximum TB (transmission block) at the Block Error Rate (BLER) that guarantees HS-DSCH under less than 10% prerequisite, and standard has been stipulated HS-DSCH _iLast time slot and HS-SICH _iBetween the interval should be at least nine time slots, because the characteristics that become when the physical channel of mobile communication has, even the UE that is obtained by HS-DSCH is accurately to the measurement of channel, but because UE can produce the unmatched phenomenon of modulation, encoding scheme and channel that is adopted equally to the hysteresis quality that the NodeB report is produced.

The utility model content

The device of a kind of correction channel quality indication that the utility model provides utilizes and handles HS-DSCH _iAnd HS-SICH _iBetween HS-SCCH _I+1With the channel information that the descending DPCH of following (DPCH) is obtained CQI is proofreaied and correct, thereby the throughput of system that non real-time brought that improves CQI to a certain extent descends, and do not need the extra too many complexity that increases.

In order to achieve the above object, the utility model provides a kind of device of correction channel quality indication, comprising: two channel estimating and path selector, and each channel estimating and path selector are exported one group of path responses data; Mod circuit, the RX path response data; Squarer links to each other with mod circuit, receives the data from mod circuit; Two summing circuits, each summing circuit connect one group of squarer, receive the data from squarer; Devision device, its input links to each other with described two summing circuit outputs; The channel quality indication database receives the data from devision device, and the delivery channel quality indication.Described devision device comprises two dividers of series connection.

The device of a kind of correction channel quality indication that the utility model provides utilizes and handles HS-DSCH _iAnd HS-SICH _iBetween HS-SCCH _I+1With the channel information that the descending DPCH of following is obtained CQI is proofreaied and correct, thereby the throughput of system that non real-time brought that improves CQI to a certain extent descends, and do not need the extra too many complexity that increases.

Described devision device comprises two dividers of series connection.

Described mod circuit quantity is suitable with described path responses data bulk, and each mod circuit receives path responses data.

Described squarer quantity is suitable with described mod circuit quantity, and each squarer links to each other with a mod circuit.

Description of drawings

Fig. 1 is common UE end HSDPA cyclic flow schematic diagram in the background technology;

Fig. 2 is the sequential organization figure that illustrates a HSDPA cycle, the HS-SCCH here _iOn TS2, follow descending DPCH on TS4;

The HSDPA cyclic flow schematic diagram of a UE end in a kind of method of improving channel quality indication accuracy that Fig. 3 is that the utility model provides;

Fig. 4 is an example hardware block diagram proofreading and correct CQI.

Embodiment

Followingly specify preferred forms of the present utility model according to Fig. 2 to Fig. 4:

As shown in Figure 4, a kind of device of correction channel quality indication comprises: two channel estimating and path selector, each channel estimating and path selector are exported one group of path responses data.Mod circuit, the RX path response data; Mod circuit quantity is suitable with described path responses data bulk, and each mod circuit receives path responses data.Squarer, squarer quantity is suitable with described mod circuit quantity, and each squarer links to each other with a mod circuit, receives the data from mod circuit.Two summing circuits, each summing circuit connect one group of squarer, receive the data from squarer.Divider, its input links to each other with described two summing circuit outputs; Another divider, its input links to each other with above-mentioned divider input.The channel quality indication database receives the data from devision device, and the delivery channel quality indication.

The aligning step of the device of corresponding correction CQI of the present utility model is as shown in Figures 2 and 3:

Step 1, processing HS-SCCH _iTo obtain HS-SCCH _iEntrained information bit;

Step 2, according to HS-SCCH _iThe UE ID that carries conforms to as the ID of this UE ID with the UE end, then carry out step 3, as not conforming to, then makes i=i+1, returns and carry out step 1;

Step 3, processing HS-DSCH _i, and definite CQI:

Step 3.1, establish HS-DSCH _iCorresponding emission symbolic representation is S (QPSK or a 16QAM symbol), can obtain the estimation of S by joint-detection at the UE end

$\tilde{S}=S+n$

N is an additive white Gaussian noise;

The energy of step 3.2, estimation n is made as σ ²

Step 3.3, establish emission symbol S _k(k=1,2 ..., L) (concerning QPSK, L=4, and concerning 16QAM, L=16) satisfy $\frac{1}{L}\underset{k=1}{\overset{L}{\mathrm{\Σ}}}{\left|S_k\right|}^2=1,$ Then can obtain i HSDPA cycle joint-detection HS-DSCH _iSignal interference ratio SIR afterwards _i=1/ σ ²

Step 3.4, in conjunction with SIR _iAnd HS-DSCH _iCode rate, modulation system, can table look-up by the form of prior formulation and obtain CQI;

Step 4, correction CQI:

Step 4.1, is as shown in Figure 2 established n subframe HS-SCCH _iCarry out with the TS2 that follows descending DPCH correspondence and TS4 that the final path responses of selecting is h after channel estimating and the Path selection _{M, 2} ¹, h _{M, 2} ²..., h _{M, 2} ^kAnd h _{M, 4} ¹, h _{M, 4} ²..., h _{M, 4} ^j, wherein the n in the subscript represents the n subframe, and 2 and 4 represent TS2 and TS4 respectively, and subscript k and j represent the number in selected path among TS2 and the TS4 respectively.

Step 4.2, correction SIR _i:

${\stackrel{\‾}{\mathrm{SIR}}}_{i,\mathrm{new}}={\stackrel{\‾}{\mathrm{SIR}}}_i*\frac{{\left|h_{n+\mathrm{1,2}}^1\right|}^2+{\left|h_{n+\mathrm{1,2}}^2\right|}^2+\·\·\·+{\left|h_{n+\mathrm{1,2}}^k\right|}^2+{\left|h_{n+1,4}^1\right|}^2+{\left|h_{n+\mathrm{1,4}}^2\right|}^2+\·\·\·{+\left|h_{n+\mathrm{1,4}}^j\right|}^2}{{\left|h_{n,2}^1\right|}^2+{\left|h_{n,2}^2\right|}^2+\·\·\·+{\left|h_{n,2}^k\right|}^2+{\left|h_{n,4}^1\right|}^2+{\left|h_{n,4}^2\right|}^2+\·\·\·+{\left|h_{n,4}^j\right|}^2}$

Step 4.3, according to SIR _{I, new}Again table look-up and determine CQI, finish correction CQI;

Step 5, CQI and ACK/NACK information after will proofreading and correct are passed through HS-SICH _iFeed back to NodeB;

The device of a kind of correction channel quality indication that the utility model provides utilizes and handles HS-DSCH _iAnd HS-SICH _iBetween HS-SCCH _I+1With the channel information that the descending DPCH of following is obtained CQI is proofreaied and correct, thereby the throughput of system that non real-time brought that improves CQI to a certain extent descends, and do not need the extra too many complexity that increases.

Claims (4)

1, a kind of device of correction channel quality indication is characterized in that, comprising:

Two channel estimating and path selector, each channel estimating and path selector are exported one group of path responses data;

Mod circuit, the RX path response data;

Squarer links to each other with mod circuit, receives the data from mod circuit;

Two summing circuits, each summing circuit connect one group of squarer, receive the data from squarer;

Devision device, its input links to each other with described two summing circuit outputs;

The channel quality indication database receives the data from devision device, and the delivery channel quality indication.

2, the device of correction channel quality indication as claimed in claim 1 is characterized in that, described devision device comprises two dividers of series connection.

3, the device of correction channel quality indication as claimed in claim 2 is characterized in that, described mod circuit quantity is suitable with described path responses data bulk, and each mod circuit receives path responses data.

As the device of claim 1 or 2 or 3 described correction channel quality indications, it is characterized in that 4, described squarer quantity is suitable with described mod circuit quantity, each squarer links to each other with a mod circuit.

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