CN101964691A - AMC adjustment method and device - Google Patents
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Abstract
The invention discloses an adaptive modulation and coding (AMC) adjustment method and an AMC adjustment device, which are used for realizing AMC adjustment based on the transmission power of a high-speed physical downlink shared channel (HS-PDSCH) in an HSPA+ system so as to use system resources more reasonably. The AMC adjustment method comprises the following steps of: determining a threshold of the HS-PDSCH transmission power corresponding to the current modulation mode; and comparing the HS-PDSCH transmission power with the threshold of the HS-PDSCH transmission power corresponding to the current modulation mode and adjusting the current modulation mode according to the comparison result.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of Adaptive Modulation and Coding (AMC, Adaptive Modulation and Coding) method of adjustment and device.
Background technology
In order to satisfy growing demand to the HRPD (high rate packet data) access service, third generation partner plan (3GPP) version 5 (Rel5) has been introduced high speed downlink packet access (HSDPA, High Speed Downlink Packages Access) technology, downlink data can obtain higher user's peak rate and cell data throughput by the HSDPA channel bearing, and reduces data transmission delay.
Based on the introducing of HSDPA technology, the channel of corresponding introducing is as follows:
Transmission channel: high speed descending sharing channel (HS-DSCH, High Speed Downlink Shared Channel), be used for bearing downlink HSDPA data, be mapped on the high speed down sharing physical channel (HS-PDSCH, High Speed Physical Downlink Shared Channel).A plurality of subscriber equipment (UE, User Equipment) shares this channel by time division multiplexing and code division multiplexing, adopt link adaptation techniques, always be attended by a DPCH (DPCH, Dedicated Physical Channel) and one or more downlink high-speed shared control channel (HS-SCCH, Shared Control Channel for HS-DSCH).
Physical channel: high speed down sharing physical channel (HS-PDSCH, High Speed Physical Downlink Shared Channel), downlink high-speed shared control channel (HS-SCCH, Shared Control Channel for HS-DSCH), high-speed shared indication channel (HS-SICH, Shared Information Channel).
Wherein, the HS-SCCH channel is a HSDPA descending scheduling control channel, takies the code channel of two descending spreading factors (SF)=16, adopts fixedly quaternary phase shift keying (QPSK, Quadrature Phase Shift Keying) modulation system is used to carry the scheduling control information of HS-DSCH.HS-SICH is the ascending control channel of HSDPA, take the code channel of a up SF=16, adopt fixedly QPSK modulation system, be used for the data block on the HS-DSCH channel that receives is replied (ACK/NACK), and the channel quality information of feeding back downlink link (CQI), thereby help base station scheduling better.In addition, HS-SICH transmitting power control (TPC, Transmission Power Control) command word of carries downlink also.
High-speed packet the advanced person inserts in (HSPA+) system, in order to make full use of resource, improve the number of users that inserts, removed dedicated channel DPCH, by the speech business (VoIP of shared channel transmission based on the IP agreement, Voice over IP), downlink transfer realizes by the HS-PDSCH channel, can adopt the semi-continuous scheduling pattern.The base station begins the semi-continuous scheduling pattern by HS-SCCH notice terminal, and the base station no longer sends HS-SCCH then, unless the semi-continuous scheduling pattern finishes.The base station sends data according to pre-configured resource by HS-PDSCH, and during semi-continuous scheduling, and the data block size (TBS) of the data that send to UE remains unchanged, and UE is by HS-SICH feedback CQI and ACK/NACK.
When realizing that under the semi-continuous scheduling pattern VoIP is professional, the resource and the data packets for transmission basic fixed of distributing for each user, it is the code check basic fixed of HS-PDSCH, in this case if meet the requirements of QoS, just need to utilize the power of HS-PDSCH is controlled the variation of following the tracks of channel circumstance, yet so just being equivalent to has not had AMC mechanism, thereby it is reasonable inadequately to cause the utilization of system resource, does not carry out the technical scheme that AMC adjusts but also provide in the prior art in the HSPA+ system based on the HS-PDSCH transmitted power.
Summary of the invention
The embodiment of the invention provides a kind of AMC method of adjustment and device, in order to being implemented in the adjustment of carrying out AMC in the HSPA+ system based on the HS-PDSCH transmitted power, thereby more reasonably utilizes system resource.
A kind of AMC method of adjustment that the embodiment of the invention provides comprises:
Determine the high speed down sharing physical channel HS-PDSCH transmitted power threshold value of current modulation mode correspondence;
HS-PDSCH transmitted power and described threshold value are compared, adjust current modulation mode according to comparative result.
A kind of AMC adjusting device that the embodiment of the invention provides comprises:
The threshold value determining unit is used for determining the high speed down sharing physical channel HS-PDSCH transmitted power threshold value of current modulation mode correspondence;
Relatively adjustment unit is used for HS-PDSCH transmitted power and described threshold value are compared, and adjusts current modulation mode according to comparative result.
The embodiment of the invention is determined the HS-PDSCH transmitted power threshold value of current modulation mode correspondence; The HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with current modulation mode compares, adjust current modulation mode according to comparative result, realized in the HSPA+ system, carrying out the adjustment of AMC based on the HS-PDSCH transmitted power, on the basis of not revising agreement, guarantee the qos requirement of HS-PDSCH when transmission VoIP is professional, and can more reasonably utilize system resource.
Description of drawings
The schematic flow sheet of a kind of AMC method of adjustment that Fig. 1 provides for the embodiment of the invention;
The structural representation of a kind of AMC adjusting device that Fig. 2 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of AMC method of adjustment and device, in order to being implemented in the adjustment of carrying out AMC in the HSPA+ system based on the HS-PDSCH transmitted power, thereby more reasonably utilizes system resource.
Lasting bag connection mode (CPC in the HSPA+ system, Continuous Packet Connection) in, HS-PDSCH is used for carrying out the downlink transfer of VoIP business, can adopt the semi-continuous scheduling pattern, do not have HS-SCCH this moment, HS-PDSCH sends data according to pre-configured resource, and during semi-continuous scheduling, the TBS of the data that UE sends remains unchanged, by HS-SICH feedback CQI and ACK/NACK.
In the professional transmission of VoIP, all basic fixed is constant for resource that base station (NodeB) is distributed for each user and data packets for transmission, that is to say that the code check basic fixed is constant, like this in order to reach the QoS that needs, follow the tracks of the variation of channel circumstance with regard to the power that requires to adjust HS-PDSCH as far as possible, so just being equivalent to has not had AMC mechanism, therefore in order to make full use of the characteristics of AMC mechanism, improve system resource utilization efficient, the embodiment of the invention has provided a kind of AMC based on the CPC characteristics and has adjusted scheme.
Because the voice packet size of VoIP business is more constant, in the professional technical scheme of transmission of VoIP, the base station is allocated semi-continuous scheduling (SPS in advance by the mode of semi-continuous scheduling, semi-persistent scheduling) resource, the code check of TBS changes little, whether whether therefore, can adopt AMC mechanism just to be presented as allows UE to select between QPSK and 16QAM modulation system.
Because the VoIP business features in the CPC characteristic, code check changes little, therefore the variation that comes adaptive channel by the transmitted power of adjusting HS-PDSCH, because the transmitted power of HS-PDSCH changes, therefore can have influence on the adjustment of the modulation system in the scheduling, prior art can adopt the adjustment foundation of the CQI of UE feedback as modulation system, and the embodiment of the invention is with the size of the HS-PDSCH transmitted power adjustment foundation as modulation system.
The described HS-PDSCH transmitted power of the embodiment of the invention is 16 transmitted power for normalizing to spreading factor (SF), perhaps is time slot gross power etc.
Below in conjunction with accompanying drawing the technical scheme that the embodiment of the invention provides is described.
Referring to Fig. 1, a kind of AMC method of adjustment that the embodiment of the invention provides comprises:
S101, determine the HS-PDSCH transmitted power threshold value of current modulation mode correspondence.
S102, the HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with current modulation mode compare, and adjust current modulation mode according to comparative result.
In the technical scheme that the embodiment of the invention provides, describe, certainly, can be suitable for equally for the adjustment of the modulation system of other kinds between QPSK and these two kinds of modulation systems of 16QAM, to be adjusted into example.
Preferably, step S102 comprises:
When current modulation mode is quaternary phase shift keying QPSK, the HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with QPSK compares, when the HS-PDSCH transmitted power is less than or equal to the HS-PDSCH transmitted power threshold value of QPSK correspondence, current modulation mode is adjusted into 16 ary quadrature amplitudes adjusts 16QAM.
Perhaps, step S102 comprises:
When current modulation mode is 16 ary quadrature amplitudes adjustment 16QAM, the HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with 16QAM compares, when HS-PDSCH transmitted power during, current modulation mode is adjusted into quaternary phase shift keying QPSK more than or equal to the HS-PDSCH transmitted power threshold value of 16QAM correspondence.
AMC adjusts the adjustment that comprises modulation system, if current modulation system has been adjusted, then current code check also must correspondingly be adjusted.
Preferably, the AMC method of adjustment that provides of the embodiment of the invention also comprises:
According to adjusted modulation system, adjust current code check.
The code check that different modulation systems is corresponding different, every kind of modulation system can corresponding a plurality of code checks, the modulation system that can store in advance and the corresponding relation of code check.When modulation system changes, can be according to adjusted modulation system, and situations such as current data amount, code channel resource, from the pairing a plurality of code checks of adjusted modulation system, determine current concrete code check size.
Be that the transmitted power that normalizes to SF=16 is an example with the HS-PDSCH transmitted power below, provide two concrete embodiment.
Embodiment one:
If current SPS modulation system is QPSK, suppose that the QPSK corresponding code rate is λ
QPSK, λ
QPSKValue can pre-set, also can adjust in real time.The transmitted power that HS-PDSCH normalizes to SF=16 is P
QPSK, with P
QPSKAt default a period of time t
QPSKIn average, obtain P '
QPSK, then with P '
QPSKThe HS-PDSCH transmitted power threshold value P corresponding with QPSK
QPSK-16QAM(being about to the threshold value that QPSK is adjusted into 16QAM) compares, if satisfy P '
QPSK≤ P
QPSK-16QAM, then modulation system is adjusted into 16QAM.
Wherein, the threshold value that QPSK is adjusted into 16QAM is:
P
QPSK-16QAM＝P
max+ΔSNR
QPSK-Δd
elta_QPSK
Wherein, P
MaxNormalize to the maximum transmit power of SF=16 for the HS-PDSCH transmitted power.
Δ
Delta_QPSKFor QPSK is adjusted into the power headroom of 16QAM, maximum transmit power P
MaxDeduct this power headroom Δ
Delta_QPSKThe value that obtains is adjusted thresholding for benchmark, and promptly λ 0
QPSKCorresponding power threshold, Δ
Delta_QPSKValue be to be λ 0 at code check
QPSKSituation under set in advance by assessment, can be worth and limit the condition that QPSK transfers 16QAM to, Δ by adjusting this
Delta_QPSKValue big more, then to transfer the power requirement of 16QAM to high more for QPSK.
QPSK is adjusted into the threshold value P of 16QAM
QPSK-16QAM, can pre-set, also can be according to DSNR
QPSKThe variation of value carry out real-time update.
Embodiment two:
If current SPS modulation system is 16QAM, the current code check of 16QAM correspondence is λ
16QAM, λ
16QAMValue can pre-set, also can adjust in real time.The transmitted power that HS-PDSCH normalizes to SF=16 is P
16QAM, with P
16QAMAt default a period of time t
QPSKIn average, obtain P '
16QAM, then with P '
16QAMThe HS-PDSCH transmitted power threshold value P corresponding with QPSK
16QAM-QPSK(being about to the threshold value that 16QAM is adjusted into QPSK) compares, if P
16QAM〉=P
16QAM-QPSK, then modulation system is adjusted into QPSK.
Wherein, the threshold value that 16QAM is adjusted into QPSK is:
P
16QAM-QPSK＝P
max+ΔSNR
16QAM-Δ
delta_16QAM
Wherein, P
MaxThe HS-PDSCH transmitted power normalizes to the maximum transmit power of SF=16.
Δ
Delta_16QAMFor 16QAM is adjusted into the power headroom of QPSK, maximum transmit power P
MaxDeduct this power headroom Δ
Delta_16QAMThe value that obtains is adjusted thresholding for benchmark, and promptly λ 0
16QAMCorresponding power threshold, Δ
Detla_16QAMValue be to be λ 0 at code check
16QAMSituation under set in advance by assessment, can be worth and limit the condition that 16QAM transfers QPSK to, Δ by adjusting this
Delta_16QAMValue more little, then to transfer the power requirement of QPSK to high more for 16QAM.
16QAM is adjusted into the threshold value P of QPSK
16QAM-QPSK, can pre-set, also can be according to DSNR
16QAMThe variation of value carry out real-time update.
In the embodiment of the invention, above-mentioned parameter t
QPSK, t
16QAM, Δ
Delta_QPSK, Δ
Delta_16QAMCan assess, test by emulation or other modes set in advance.
From the angle of saving control channel expense, the conversion that the SPS resource can not be frequent, so the change in resources frequency of modulation system conversion can not be too fast, should be the process of adjusting at a slow speed, therefore can pass through the parameter Δ
Delta_QPSK, Δ
Delta_16QAMAnd t
QPSK, t
16QAMBe provided with and control the frequency that modulation system changes, it is bigger that the value of these parameters is provided with, then the meeting that changes of modulation system is slow, otherwise it is smaller that the value of these parameters is provided with, then the meeting that changes of modulation system is than comparatively fast.
In addition, need to prove, if the HS-PDSCH transmitted power is the time slot gross power, the P in the then above-mentioned formula
MaxDo not adopt the HS-PDSCH transmitted power to normalize to the maximum transmit power of SF=16, but be made as the time slot maximum transmit power.
Exemplify below in the embodiment of the invention and how the HS-PDSCH transmitted power is adjusted.
Set in advance initial transmission power and the target bit rate of HS-PDSCH, in the specific implementation process, comprising:
Step 1: use the CQI of the last feedback of UE to convert out code check.
Step 2: the difference of calculating target bit rate that sets in advance and the code check of converting out.
Step 3: the difference of utilizing step 2 to calculate, rated output adjustment amount.
Step 4: use the transmitting power of the pairing HS-PDSCH of CQI of the last feedback of UE to add the above power adjustment, calculate the transmitting power of current HS-PDSCH.
Because CQI is the reflection of channel circumstance quality, therefore the code check that utilizes CQI to convert out carries out power control, can follow the tracks of the variation of channel circumstance, therefore make the VoIP business under the situation of resource of distributing for each user and data packets for transmission basic fixed, realized power control to HS-PDSCH, thereby meet the requirements of QoS, guaranteed the transmission quality of VoIP.
Referring to Fig. 2, a kind of AMC adjusting device that the embodiment of the invention provides comprises:
Threshold value determining unit 11 is used for determining the HS-PDSCH transmitted power threshold value of current modulation mode correspondence.
Modulation system adjustment unit 12 is used for comparing by the HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with current modulation mode, adjusts current modulation mode.
Preferably, described modulation system adjustment unit 12, when current modulation mode is quaternary phase shift keying QPSK, the HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with QPSK compares, when the HS-PDSCH transmitted power is less than or equal to the HS-PDSCH transmitted power threshold value of QPSK correspondence, current modulation mode is adjusted into 16 ary quadrature amplitudes adjusts 16QAM.
Preferably, described modulation system adjustment unit 12, when current modulation mode is 16 ary quadrature amplitudes adjustment 16QAM, the HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with 16QAM compares, when HS-PDSCH transmitted power during, current modulation mode is adjusted into quaternary phase shift keying QPSK more than or equal to the HS-PDSCH transmitted power threshold value of 16QAM correspondence.
Preferably, the value of the HS-PDSCH transmitted power that described modulation system adjustment unit 12 adopts is the mean value of the HS-PDSCH transmitted power in the Preset Time section.
Preferably, the HS-PDSCH transmitted power that described modulation system adjustment unit 12 adopts is 16 transmitted power for normalizing to spreading factor SF, perhaps is the time slot gross power.
Preferably, described device also comprises:
Code check adjustment unit 13 is used for adjusting current code check according to adjusted modulation system.
Preferably, a kind of AMC adjusting device that the embodiment of the invention provides can be the base station.
In sum, the embodiment of the invention is determined the high speed down sharing physical channel HS-PDSCH transmitted power threshold value of current modulation mode correspondence; Compare by the high speed down sharing physical channel HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with current modulation mode, adjust current modulation mode, realized in the HSPA+ system, carrying out the adjustment of AMC based on the HS-PDSCH transmitted power, on the basis of not revising agreement, guarantee the qos requirement of HS-PDSCH when transmission VoIP is professional, and can more reasonably utilize system resource.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. Adaptive Modulation and Coding AMC method of adjustment is characterized in that this method comprises:
Determine the high speed down sharing physical channel HS-PDSCH transmitted power threshold value of current modulation mode correspondence;
HS-PDSCH transmitted power and described threshold value are compared, adjust current modulation mode according to comparative result.
2. method according to claim 1 is characterized in that, HS-PDSCH transmitted power and described threshold value are compared, and the step of adjusting current modulation mode according to comparative result comprises:
When current modulation mode is quaternary phase shift keying QPSK, the HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with QPSK compares, when the HS-PDSCH transmitted power is less than or equal to the HS-PDSCH transmitted power threshold value of QPSK correspondence, current modulation mode is adjusted into 16 ary quadrature amplitudes adjusts 16QAM.
3. method according to claim 1 is characterized in that, HS-PDSCH transmitted power and described threshold value are compared, and the step of adjusting current modulation mode according to comparative result comprises:
When current modulation mode is 16 ary quadrature amplitudes adjustment 16QAM, the HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with 16QAM compares, when HS-PDSCH transmitted power during, current modulation mode is adjusted into quaternary phase shift keying QPSK more than or equal to the HS-PDSCH transmitted power threshold value of 16QAM correspondence.
4. according to claim 1,2 or 3 described methods, it is characterized in that described HS-PDSCH transmitted power is 16 transmitted power for normalizing to spreading factor SF, perhaps is the time slot gross power.
5. according to claim 1,2 or 3 described methods, it is characterized in that this method also comprises:
According to adjusted modulation system, adjust current code check.
6. Adaptive Modulation and Coding AMC adjusting device is characterized in that described device comprises:
The threshold value determining unit is used for determining the high speed down sharing physical channel HS-PDSCH transmitted power threshold value of current modulation mode correspondence;
The modulation system adjustment unit is used for HS-PDSCH transmitted power and described threshold value are compared, and adjusts current modulation mode according to comparative result.
7. device according to claim 6, it is characterized in that, described modulation system adjustment unit, when current modulation mode is quaternary phase shift keying QPSK, the HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with QPSK compares, when the HS-PDSCH transmitted power is less than or equal to the HS-PDSCH transmitted power threshold value of QPSK correspondence, current modulation mode is adjusted into 16 ary quadrature amplitudes adjusts 16QAM.
8. device according to claim 6, it is characterized in that, described modulation system adjustment unit, when current modulation mode is 16 ary quadrature amplitudes adjustment 16QAM, the HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with 16QAM compares, when HS-PDSCH transmitted power during, current modulation mode is adjusted into quaternary phase shift keying QPSK more than or equal to the HS-PDSCH transmitted power threshold value of 16QAM correspondence.
9. according to claim 6,7 or 8 described devices, it is characterized in that the HS-PDSCH transmitted power that described modulation system adjustment unit adopts is 16 transmitted power for normalizing to spreading factor SF, perhaps is the time slot gross power.
10. according to claim 6,7 or 8 described devices, it is characterized in that described device also comprises:
The code check adjustment unit is used for adjusting current code check according to adjusted modulation system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475442A (en) * | 2012-06-06 | 2013-12-25 | 中兴通讯股份有限公司 | Adaptive modulation and coding AMC method and device |
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|---|---|---|---|---|
| WO2007036031A1 (en) * | 2005-09-30 | 2007-04-05 | Nortel Networks Limited | Adaptive power control data transmission systems and methods |
| CN101132212A (en) * | 2006-08-22 | 2008-02-27 | 中兴通讯股份有限公司 | Link self-adapting method |
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2009
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007036031A1 (en) * | 2005-09-30 | 2007-04-05 | Nortel Networks Limited | Adaptive power control data transmission systems and methods |
| CN101132212A (en) * | 2006-08-22 | 2008-02-27 | 中兴通讯股份有限公司 | Link self-adapting method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475442A (en) * | 2012-06-06 | 2013-12-25 | 中兴通讯股份有限公司 | Adaptive modulation and coding AMC method and device |
| CN103475442B (en) * | 2012-06-06 | 2016-08-24 | 中兴通讯股份有限公司 | The method and apparatus of Adaptive Modulation and Coding AMC |
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