CN101964691B - 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, AdaptiveModulation and Coding) method of adjustment and device.
Background technology
In order to satisfy the 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 DownlinkPackages 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 SharedChannel), be used for bearing downlink HSDPA data, be mapped on high speed down sharing physical channel (HS-PDSCH, High Speed Physical Downlink Shared Channel).A plurality of subscriber equipment (UE, User Equipment) share 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 forHS-DSCH).
Physical channel: high speed down sharing physical channel (HS-PDSCH, High Speed PhysicalDownlink Shared Channel), downlink high-speed shared control channel (HS-SCCH, Shared ControlChannel for HS-DSCH), high-speed shared indication channel (HS-SICH, Shared InformationChannel).
Wherein, the HS-SCCH channel is HSDPA descending scheduling control channel, take the code channel of two descending spreading factors (SF)=16, adopt fixedly quaternary phase shift keying (QPSK, Quadrature Phase ShiftKeying) modulation system is for the scheduling control information of carrying 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 better base station scheduling.In addition, HS-SICH also the transmitting power of carries downlink control (TPC, Transmission Power Control) command word.
In advanced person's high-speed packet accesses (HSPA+) system, in order to take full advantage of resource, improve the number of users of access, removed dedicated channel DPCH, transmit speech business (VoIP based on the IP agreement by shared channel, 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 the HS-SCCH notification terminal, and then the base station no longer sends HS-SCCH, 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 feeds back CQI and ACK/NACK by HS-SICH.
When realizing the VoIP business under the semi-continuous scheduling pattern, give the packet of the resource of each user assignment and transmission substantially fixing, the code check that is HS-PDSCH is substantially fixing, in this case if meet the requirements of QoS, just need to utilize the variation of the power of HS-PDSCH being controlled to follow the tracks of channel circumstance, yet so just be equivalent to not have AMC mechanism, thereby it is reasonable not to cause the utilization of system resource, does not carry out based on the HS-PDSCH transmitted power technical scheme that AMC adjusts but also provide in prior art in the HSPA+ system.
Summary of the invention
The embodiment of the present invention provides a kind of AMC method of adjustment and device, in order to realizing carrying out the adjustment of AMC based on the HS-PDSCH transmitted power in the HSPA+ system, thereby more reasonably utilizes system resource.
A kind of AMC method of adjustment that the embodiment of the present invention provides comprises:
Determine the high speed down sharing physical channel HS-PDSCH transmitted power threshold value that current modulation mode is corresponding;
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 present invention provides comprises:
The threshold value determining unit is used for determining high speed down sharing physical channel HS-PDSCH transmitted power threshold value corresponding to current modulation mode;
Relatively adjustment unit, be 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 present invention is determined the HS-PDSCH transmitted power threshold value that current modulation mode is corresponding; 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 carrying out the adjustment of AMC based on the HS-PDSCH transmitted power in the HSPA+ system, on the basis of not revising agreement, guarantee the qos requirement of HS-PDSCH when transmission VoIP business, 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 present invention;
The structural representation of a kind of AMC adjusting device that Fig. 2 provides for the embodiment of the present invention.
Embodiment
The embodiment of the present invention provides a kind of AMC method of adjustment and device, in order to realizing carrying out the adjustment of AMC based on the HS-PDSCH transmitted power in the HSPA+ system, 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, there is no 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, and feeds back CQI and ACK/NACK by HS-SICH.
In the transmission of VoIP business, base station (NodeB) immobilizes substantially for the packet of the resource of each user assignment and transmission, that is to say that code check immobilizes substantially, 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 be equivalent to not have AMC mechanism, therefore in order to take full advantage of the characteristics of AMC mechanism, improve system resource utilization efficient, the embodiment of the present 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 technical scheme of VoIP business transmission, the base station is allocated semi-continuous scheduling (SPS in advance by the mode of semi-continuous scheduling, semi-persistentscheduling) 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.
Characteristics due to the VoIP business in the CPC characteristic, code check changes little, therefore come the variation of 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 scheduling, prior art can adopt the CQI of UE feedback as the adjustment foundation of modulation system, and the embodiment of the present 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 present invention is 16 transmitted power for normalizing to spreading factor (SF), is perhaps time slot gross power etc.
Below in conjunction with accompanying drawing, the technical scheme that the embodiment of the present invention provides is described.
Referring to Fig. 1, a kind of AMC method of adjustment that the embodiment of the present invention provides comprises:
S101, determine the HS-PDSCH transmitted power threshold value that current modulation mode is corresponding.
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 present invention provides, describe to be adjusted into example between QPSK and these two kinds of modulation systems of 16QAM, certainly for the adjustment of the modulation system of other kinds, can be suitable for equally.
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 HS-PDSCH transmitted power threshold value corresponding to QPSK, 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, during more than or equal to HS-PDSCH transmitted power threshold value corresponding to 16QAM, current modulation mode is adjusted into quaternary phase shift keying QPSK when the HS-PDSCH transmitted power.
AMC adjusts the adjustment that comprises modulation system, if current modulation system has been adjusted, current code check also must correspondingly be adjusted.
Preferably, the AMC method of adjustment that provides of the embodiment of the present invention also comprises:
According to the modulation system after adjusting, 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, modulation system that can be pre-stored and the corresponding relation of code check.When modulation system changes, can be according to the modulation system after adjusting, and the situations such as current data amount, code channel resource, determine current concrete code check size the corresponding a plurality of code checks of modulation system after adjusting.
The below as the transmitted power that normalizes to SF=16 as example, provides two concrete embodiment take the HS-PDSCH transmitted power.
Embodiment one:
If current SPS modulation system is QPSK, suppose that code check corresponding to QPSK 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, modulation system is adjusted into 16QAM.
Wherein, the threshold value that QPSK is adjusted into 16QAM is:
P
QPSK-16QAM＝P
max+ΔSNR
QPSK-Δ
delta_QPSK
Wherein, P
maxNormalize to the maximum transmit power of SF=16 for the HS-PDSCH transmitted power.
Δ
Delta_QPSKBe adjusted into the power headroom of 16QAM for QPSK, maximum transmit power P
maxDeduct this power headroom Δ
Delta_QPSKThe value that obtains is adjusted thresholding for benchmark, and namely 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 to limit the condition that QPSK transfers 16QAM to, Δ by adjusting this
Delta_QPSKValue larger, to transfer the power requirement of 16QAM to higher for QPSK.
QPSK is adjusted into the threshold value P of 16QAM
QPSK-16QAM, can pre-set, can be also 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 that 16QAM is corresponding 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, 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_16QAMBe adjusted into the power headroom of QPSK for 16QAM, maximum transmit power P
maxDeduct this power headroom Δ
Delta_16QAMThe value that obtains is adjusted thresholding for benchmark, and namely λ 0
16QAMCorresponding power threshold, Δ
Delta_16QAMValue be to be λ 0 at code check
16QAMSituation under set in advance by assessment, can be worth to limit the condition that 16QAM transfers QPSK to, Δ by adjusting this
Delta_16QAMValue less, to transfer the power requirement of QPSK to higher for 16QAM.
16QAM is adjusted into the threshold value P of QPSK
16QAM-QPSK, can pre-set, can be also according to DSNR
16QAMThe variation of value carry out real-time update.
In the embodiment of the present invention, above-mentioned parameter t
QPSK, t
16QAM, Δ
Delta_QPSK, Δ
Delta_16QAMCan set in advance by Simulation Evaluation, test or other modes.
From the angle of saving control channel expense, the conversion frequently of SPS resource, 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
16QAMArrange to control the frequency that modulation system changes, it is larger that the value of these parameters arranges, the meeting that changes of modulation system is slow, otherwise it is smaller that the value of these parameters arranges, 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 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.
The below exemplifies in the embodiment of the present 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 the 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 corresponding HS-PDSCH of CQI of the last feedback of UE to add the above power adjustment, calculate the transmitting power of current HS-PDSCH.
It is the reflection of channel circumstance quality due to CQI, therefore utilize the code check that CQI converts out to carry out power control, can follow the tracks of the variation of channel circumstance, therefore make the VoIP business in the situation that substantially fix to the resource of each user assignment and the packet of transmission, realized the power of HS-PDSCH is controlled, 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 present invention provides comprises:
Threshold value determining unit 11 is used for determining HS-PDSCH transmitted power threshold value corresponding to current modulation mode.
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 HS-PDSCH transmitted power threshold value corresponding to QPSK, 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, during more than or equal to HS-PDSCH transmitted power threshold value corresponding to 16QAM, current modulation mode is adjusted into quaternary phase shift keying QPSK when the HS-PDSCH transmitted power.
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, is perhaps the time slot gross power.
Preferably, described device also comprises:
Rate adjust unit 13 is used for adjusting current code check according to the modulation system after adjusting.
Preferably, a kind of AMC adjusting device that the embodiment of the present invention provides can be the base station.
In sum, the embodiment of the present invention is determined the high speed down sharing physical channel HS-PDSCH transmitted power threshold value that current modulation mode is corresponding; 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 carrying out the adjustment of AMC based on the HS-PDSCH transmitted power in the HSPA+ system, on the basis of not revising agreement, guarantee the qos requirement of HS-PDSCH when transmission VoIP business, and can more reasonably utilize system resource.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. an Adaptive Modulation and Coding AMC method of adjustment, is characterized in that, the method comprises:
Determine the high speed down sharing physical channel HS-PDSCH transmitted power threshold value that current modulation mode is corresponding;
HS-PDSCH transmitted power and described threshold value are compared, adjust current modulation mode according to comparative result;
Wherein, the transmitting power of described HS-PDSCH adopts following steps to determine:
The channel quality information CQI of the last feedback of user's equipment UE converts out code check;
The difference of the target bit rate that calculating sets in advance and the code check of converting out;
Utilize described difference, the rated output adjustment amount;
Use the transmitting power of the corresponding HS-PDSCH of CQI of the last feedback of UE to add the above power adjustment, determine the transmitting power of current HS-PDSCH.
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 HS-PDSCH transmitted power threshold value corresponding to QPSK, current modulation mode is adjusted into 16 ary quadrature amplitude 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 amplitude 16QAM, the HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with 16QAM compares, during more than or equal to HS-PDSCH transmitted power threshold value corresponding to 16QAM, current modulation mode is adjusted into quaternary phase shift keying QPSK when the HS-PDSCH transmitted power.
4. according to claim 1,2 or 3 described methods, is characterized in that, described HS-PDSCH transmitted power is 16 transmitted power for normalizing to spreading factor SF, is perhaps the time slot gross power.
5. according to claim 1,2 or 3 described methods, is characterized in that, the method also comprises:
According to the modulation system after adjusting, adjust current code check.
6. an Adaptive Modulation and Coding AMC adjusting device, is characterized in that, described device comprises:
The threshold value determining unit is used for determining high speed down sharing physical channel HS-PDSCH transmitted power threshold value corresponding to current modulation mode;
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;
Wherein, the transmitting power of described HS-PDSCH adopts following steps to determine:
The channel quality information CQI of the last feedback of user's equipment UE converts out code check;
The difference of the target bit rate that calculating sets in advance and the code check of converting out;
Utilize described difference, the rated output adjustment amount;
Use the transmitting power of the corresponding HS-PDSCH of CQI of the last feedback of UE to add the above power adjustment, determine the transmitting power of current HS-PDSCH.
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 HS-PDSCH transmitted power threshold value corresponding to QPSK, current modulation mode is adjusted into 16 ary quadrature amplitude 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 amplitude 16QAM, the HS-PDSCH transmitted power threshold value that the HS-PDSCH transmitted power is corresponding with 16QAM compares, during more than or equal to HS-PDSCH transmitted power threshold value corresponding to 16QAM, current modulation mode is adjusted into quaternary phase shift keying QPSK when the HS-PDSCH transmitted power.
9. according to claim 6,7 or 8 described devices, 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, is perhaps the time slot gross power.
10. according to claim 6,7 or 8 described devices, is characterized in that, described device also comprises: the rate adjust unit is used for adjusting current code check according to the modulation system after adjusting.
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Effective date of registration: 20210528 Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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