CN101383680B - Transmission format selecting method for reinforced dedicated channel - Google Patents
Transmission format selecting method for reinforced dedicated channel Download PDFInfo
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Abstract
The invention provides a transformat selection method of an enhanced dedicated channel (E-DCH), which comprises the following steps: A, the linear equation of the corresponding relation of the code rate interval used by each section and the power is determined according to the power allocated by a radio resource control (RRC) layer, the reference point set of the code rate, and the maximum code rate and the minimum code rate; B, after the physical resource allocated by the network is received, the maximum transmission ratio (bits) supported by a medium access control (MAC) layer is determinedaccording to the physical resource and the linear equation; C, the maximum transformat supported by the MAC layer is selected from a transformat sheet according to the maximum transmission ratio (bits). According to the invention, the complexity of the transformat selection algorithm is effectively lowered, the determination of the maximum transmission ratio (bits) supported by the MAC layer is quickened, thereby the maximum transmission transformat supported by the MAC layer can be quickly determined, the time consumed for selecting the transformat is reduced, and enough time can be reservedfor subsequent operation of a terminal.
Description
Technical field
The present invention relates to 3-G (Generation Three mobile communication system), strengthen the transfer format selecting method of dedicated channel during particularly a kind of high speed uplink packet inserts.
Background technology
Along with 3-G (Generation Three mobile communication system) (The 3rd Generation, continuous development 3G), the application that much has more user experience has been created in the raising of downloading rate, but simultaneously, because the restriction of uploading rate, some application also is restricted, and uploads such interactive application that uploading rate is had relatively high expectations such as mobile blog, video.In order to satisfy the market demand more and more higher to uploading rate, the 3GPP of International Standards Organization of 3G (Third Generation) Moblie (3rd Generation Project Partnership) has proposed HSUPA (High Speed Uplink Packet Access, high speed uplink packet inserts) and has carried out standardization in its Release6 version; And in the standard of subsequently Release7 version, revise and perfect.
The key technology that HSUPA adopts comprises HARQ (Hybrid Automatic Repeat reQuest, mix automatic repeat requests), 16QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) high order modulation and base-station node (Node-B) fast dispatch.At MAC (MediaAccess Control, media interviews control) layer, introduced new uplink transport channel E-DCH (Enhanced DedicatedChennel, strengthen dedicated channel), HSUPA has also introduced new physical channel such as E-UCCH (E-DCHUplink Control Channel, strengthen ascending control channel), E-PUCH (E-DCH Physical UplinkChannel, strengthen uplink physical channel), E-AGCH (E-DCH Absolute Grant Channel, the E-DCH absolute grant channel), E-HICH (E-DCH Hybrid ARQ AcknowledgementIndicator Channel, E-DCH HARQ confirms indicating channel) and corresponding M AC layer entity MAC-es, MAC-e.Wherein, E-DCH is carried by E-PUCH; E-UCCH is carrying the corresponding indication to the transmitting uplink data form as the part of E-PUCH structure of time slot.
The HARQ agreement is based on synchronous descending ACK/NACK and asynchronous uplink retransmission for stopping-waiting for agreement.For scheduled transmission, the MAC-e PDU of transmission before receive NACK, user terminal (UE) only just retransmits when having suitable physical resource to use, otherwise UE must wait for and receives suitable absolute grant.
The HARQ protocol operation is: if UE receives an absolute permission (AbsoluteGrant) at subframe i, then at data block MAC-e PDU of subframe (i+T1) transmission.Because the restriction (very short usually, as to have only several time slots, about 5ms) of T1, very high requirement has been proposed for the software and hardware disposal ability of terminal.Wherein leaving the MAC layer for does the time that transformat selects and lacks very much (generally having only time slots one or two) especially, so how improving the transformat selection algorithm to reduce the time that the transformat selection is consumed, is exactly a problem that urgency is to be solved for the terminal of hope support HSUPA.
The method that provides in the agreement of 3GPP roughly flow process is: obtain physical resource (power resource, time interval resource and code channel resource); For each transformat (under the situation that the timeslot number of E-PUCH is determined in UE ability rating and 1 TTI 64 kinds of transformats being arranged), calculate of the mapping of transmission block size, promptly calculate its (QPSK and 16QAM) required power resource under the different modulating mode to power; Then transformat is selected.Wherein, for of the mapping of transmission block size, need repeatedly calculate, up to finding the maximum transport format that is no more than Power Limitation to power.Obviously, this method need consume the processing time of a large amount of CPU.
Summary of the invention
Technical problem to be solved by this invention provides the transfer format selecting method that strengthens dedicated channel in a kind of high speed uplink packet access, can effectively reduce the complexity of transformat selection algorithm, accelerate the maximum transmitted bit number that definite MAC layer can be supported, thereby determine the maximum transport format that the MAC layer can be supported rapidly, reducing the time that the transformat selection is consumed, is that time enough is reserved in the subsequent operation of terminal.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
The transfer format selecting method of a kind of enhancing dedicated channel (E-DCH) comprises the steps:
A, according to power of Radio Resource control (RRC) layer configuration, reference point set and maximum, the minimum code rate of code check, determine the interval linear equation with the power corresponding relation of every section available code check;
B, receive the physical resource of network allocation after, determine the maximum transmitted bit number that medium access control (MAC) layer is supported according to described physical resource and linear equation;
C, according to described maximum transmitted bit number, the maximum transport format of from transport format table, selecting the MAC layer to support.
Above-mentioned method, step B specifically comprises:
B1, calculate the maximum power that is used to strengthen uplink physical channel (E-PUCH) secured transmission of payload data, determine the maximum transmitted code check according to described maximum power and described linear equation according to the power resource of network allocation;
B2, determine effective 5 bit numbers that E-PUCH can carry according to the time interval resource and the code channel resource of network allocation;
B3, the significant bit number that described maximum transmitted code check and E-PUCH can be carried multiply each other, and obtain the maximum transmitted bit number that the MAC layer is supported.
Above-mentioned method among the step B1, is calculated the maximum power β of E-PUCH secured transmission of payload data according to following formula
0e: P
E-PUCH=P
E-base+ L+ β
e, β
e=β
0e+ α
e+ Δ
Harq, wherein, P
E-PUCHBe the maximum power resource of network allocation, L is a path loss, P
E-baseBe closed-loop power control performance number, Δ
HarqFor mixing automatic repeat requests (HARQ) power excursion, α
eCompensation for spreading factor.
Above-mentioned method, among the step B2, described significant bit number is meant and does not comprise the bit number that strengthens ascending control channel (E-UCCH) data.
Above-mentioned method, step C specifically comprises: determine the position of described maximum transmitted bit number in transport format table with dichotomy, select to be no more than the maximum transport format of described maximum transmitted bit number from described transformat.
Above-mentioned method, in the steps A, power when being respectively QPSK, 16QAM according to the modulation system of rrc layer configuration, reference point set and maximum, the minimum code rate of code check are determined when modulation system is QPSK, 16QAM the interval linear equation with the power corresponding relation of every section available code check respectively;
Among the step B, receive the physical resource of network allocation after, according to described physical resource and linear equation, determine the maximum transmitted bit number S1 that MAC layer when modulation system is QPSK is supported, and the modulation system maximum transmitted bit number S2 that the MAC layer is supported when being 16QAM;
Step C specifically comprises:
C1, from transport format table, select to be no more than the maximum transport format F1 of S1;
C2, from transport format table, select to be no more than the maximum transport format F2 of S2;
C3, select the greater among F1, the F2, and the modulation system of selecting described the greater correspondence is as final modulation system as final transformat.
Above-mentioned method, among the step C3, if the equal and opposite in direction of F1, F2 then further calculates the through-put power that F1, F2 need respectively, select required through-put power smaller as final transformat, and the modulation system of selecting required through-put power smaller's correspondence is as final modulation system.
Above-mentioned method, among the step C3, if calculate the through-put power equal and opposite in direction that F1, F2 need respectively, then selecting F1 is final transformat, and selects QPSK as final modulation system.
In the prior art, all will carry out the mapping of code check to power for every kind of transformat, every kind of modulation system need be calculated at most 64 times, and is consuming time very long.The present invention pre-determines the every section available code check interval and the linear equation of power corresponding relation; Physical resource and described linear equation according to network allocation are determined the maximum number bits that the MAC layer can be supported, and then the maximum transport format that can support of definite MAC layer.For every kind of modulation system, general only the needs calculated the once mapping from power to the code check, promptly receives amount of calculation required after the absolute grant of network seldom, so, greatly improved the speed that transformat is selected.
Description of drawings
Fig. 1 is the transfer format selecting method flow chart of the enhancing dedicated channel of the embodiment of the invention;
Fig. 2 concerns reference point set schematic diagram for rrc layer in the embodiment of the invention for power and the code check that the MAC layer disposes;
Fig. 3 is the interval schematic diagram with the power corresponding relation of available code check in the embodiment of the invention;
Fig. 4 is the computational process schematic diagram of maximum transmitted bit number in the embodiment of the invention;
Fig. 5 is in the embodiment of the invention, under the QPSK modulation system, determines the schematic diagram of maximum transmitted code check according to power code check relation;
Fig. 6 is a flow chart of determining the maximum transmitted code check in the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
With reference to Fig. 1, the transfer format selecting method of the enhancing dedicated channel of the embodiment of the invention mainly comprises the steps:
Step 101: control the power of (RRC) layer configuration, reference point set and maximum, the minimum code rate of code check according to Radio Resource, determine the every section available code check interval and the linear equation of power corresponding relation.
This step is the preceding data preparatory stage of physical resource of receiving network allocation.Available code check interval is meant: code check is in the minimum code rate of rrc layer configuration and the code check interval between the maximal rate.
The MAC layer is in order to reduce the complexity of transformat selection algorithm, give at rrc layer the through-put power of MAC layer configuration gather with the reference point of code check relation and the restriction of minimum and maximum code check after, receiving that network authorization (distribution physical resource) is preceding, determine the code check set of the actual employing of UE, the slope that calculates between contiguous two reference points reaches the power collection of the code check reference point that adopts corresponding to reality, and determines the linear equation in every section interval.
If UE can adopt multiple modulation system, for example can adopt QPSK and 16QAM, the power when rrc layer then needs to be respectively QPSK, 16QAM to MAC layer configuration modulation system, reference point set and maximum, the minimum code rate of code check; The MAC layer needs to determine respectively when modulation system is QPSK, 16QAM the interval linear equation with the power corresponding relation of every section available code check.
Step 102: after receiving the physical resource of network allocation, determine the maximum transmitted bit number that medium access control (MAC) layer is supported according to described physical resource and linear equation.
The physical resource of network allocation comprises power resource, time interval resource and code channel resource.After receiving network authorization, at first, calculating UE according to power resource is the maximum transmitted code check of being supported under the situation of QPSK and 16QAM in modulation system respectively, particularly, calculate the maximum power that is used to strengthen uplink physical channel (E-PUCH) secured transmission of payload data according to power resource,, determine the code check interval at place according to the intersection point of maximum power and code check-power relation curve chart, according to this interval linear equation, determine the maximum transmitted code check then;
Secondly, determine under two kinds of modulation systems the significant bit number that E-PUCH can carry (not comprising the E-UCCH data) according to time interval resource and code channel resource;
At last, determine that UE is the maximum transmitted bit number of being supported under the situation of QPSK and 16QAM in modulation system respectively, particularly, the significant bit number that described maximum transmitted code check and E-PUCH can be carried multiplies each other, and obtains the maximum transmitted bit number that the MAC layer is supported.
Step 103: according to described maximum transmitted bit number, the maximum transport format of from transport format table, selecting the MAC layer to support.
Under the restriction of maximum transmitted bit number, determine the maximum transport format that UE supports when the different modulating mode, promptly determine the position of this numerical value in transport format table (size is arranged by ascending order), select to be no more than the maximum transport format of described maximum transmitted bit number with dichotomy; And economize principle most according to power and determine it is to adopt QPSK mode or the mode of 16QAM to modulate at last.
Below respectively step 101,102,103 operation are described in detail.
With reference to Fig. 2, the power the when modulation system that has provided the RRC configuration is QPSK and the reference point set of code check: power β ' [0] collection, code check λ ' [0] collection, minimum and maximum code check: λ max, λ min.
With reference to Fig. 3, determine the n segment encode rate interval (n=5 in this example) of the actual employing of UE to calculate every section pairing set of slopes k[0 in interval according to the restriction of λ max, λ min], and determine the linear equation λ=y in every section interval
i(β), i=1,2...n (note: rated output is during to the mapping of code check, if power not in valid interval (i=1,2 ... n), if power is less than the minimum value among β [0] [0] and the β [0] [1], linear equation employing λ=y then
1(β), if power greater than the maximum among β [0] [n-1] and the β [0] [n], then linear equation adopts λ=y
n(β).
Equally, disposed the reference point set of other cover power and code check for 16QAM modulation system RRC: power β [1] collection and code check λ [1] collection, minimum and maximum code check λ max, λ min, interval and the slope collection k[1 of its code check] account form such as QPSK identical, repeat no more in this example.
By step 101, we obtain like this: actual bit rate interval number n, power collection, code check collection, slope collection and each section power are to the mapping formula λ=y of code check under two kinds of modulation systems
i(β), λ=z
i(β), i=1,2...n.
With reference to Fig. 4, the computational process of maximum transmitted bit number comprises in the step 202:
Step 401: the power resource according to network allocation calculates the maximum power that is used for the E-PUCH secured transmission of payload data.
On the E-AGCH channel, receive the physical resource of network allocation: maximum power resource P
E-PUCH, time interval resource, code channel resource (can release spreading factor SF (1,2,4,8,16)).According to the maximum power resource of network allocation, considering path loss L, closed-loop power control performance number P
E-base, HARQ power excursion Δ
HarqAnd the compensation α of different spreading factors
eSituation under, calculate the maximum power β be actually used in the E-PUCH secured transmission of payload data
0e:
P
E-PUCH＝P
e-base+L+β
e (1)
β
e＝β
0e+α
e+Δ
harq (2)
Step 402: determine the maximum transmitted code check according to described maximum power and described linear equation.
According to β
0e, power collection β [0], β [1], code check collection λ [0], λ [1], slope collection k[0], k[1], each section power is to the mapping formula λ=y of code check
i(β), λ=z
i(β), i=1,2...n determines UE maximum transmitted code check: λ max1 (QPSK), λ max2 (16QAM) under the different modulating mode in the available code check interval of reality.
Can find out β visually by Fig. 5
0ePairing maximal rate value λ max1 is in the 3rd code check interval (λ [0] [2], λ [0] [3]).The value of λ max1 can be derived out by following computing formula:
β
0e＝β[0][i-1]+k[0][i-1](λmax1-λ[0][i-1]) (3)
I=3 in this example.
Equally, for 16QAM, corresponding λ max2 can be obtained by identical mode.
The idiographic flow of step 402 can be with reference to figure 6, to being explained as follows in detail of Fig. 6:
According to β
0eWith the comparison of the pairing power of code check interval endpoint, (even i=n=5, i--), final result has three kinds of situations: (1) β from the interval one by one search of the interval beginning of maximal rate
0eGreater than any power reference point on the curve, then make λ max1=λ [0] [5]; (2) β
0eLess than any power reference point on the curve, then make λ max1=0, promptly UE can not transmit data, program suspension; (3) find β
0eWith determined power rate curve (Fig. 5) in the step 101 crossing a bit, then obtain λ max1 according to formula (3), this example promptly is this kind situation.
At first, according to k[0] trend (rise or descend) that changes with code check of this interval internal power of positive negative judgement of [i].If ascendant trend then compares β
0eWith the relation of (β [0] [i-1], β [0] [i]), possible situation has: (1) β
0e〉=β [0] [i] then makes λ max1=λ [0] [i]; (2) β
0e＜β [0] [i-1] makes i--, promptly searches for next code check interval; (3) β [0] [i-1]＜=β
0e＜β [0] [i] then obtains λ max1 according to formula (3).If β is then compared in downward trend
0eRelation with (β [0] [i], β [0] [i-1]): (1) β
0e〉=β [0] [i-1] then makes λ max1=λ [0] [i-1]; (2) β
0e＜β [0] [i] makes i--, promptly searches for next code check interval; (3) β [0] [i]＜=β
0e＜β [0] [i-1] then obtains λ max1 according to formula (3).If find suitable λ max1 (non-vanishing) in the above step, then write down the interval I of code check at its place
λ
Equally, for 16QAM, adopt similar method to obtain λ max2.
Step 403: time interval resource and code channel resource according to network allocation are determined the significant bit number that E-PUCH can carry.
In this step, determine according to time interval resource and code channel resource (spreading factor): in the physical channel mapping stage, the significant bit number (data that do not comprise E-UCCH) that the different modulation system of the last employing of E-PUCH can be carried: Re1 (QPSK), Re2 (16QAM).
Step 404: the significant bit number that described maximum transmitted code check and E-PUCH can be carried multiplies each other, and obtains the maximum transmitted bit number that the MAC layer is supported.
According to bit number Re1, the Re2 (data that do not comprise E-UCCH) that can carry on UE maximum transmitted code check code check λ max1, λ max2 and the E-PUCH, according to formula: Smax=λ max*Re, obtaining UE is maximum transmitted bit number Smax1, the Smax2 that is supported under the situation of QPSK and 16QAM in modulation system respectively.
In step 103, select final transformat and modulation system, specifically comprise:
Step S31: corresponding two kinds of different modulation systems, the maximum transport format of selecting UE under the restriction of Smax1, Smax2, to support.According to dichotomy, determine that rapidly Smax1, Smax2 are at transport block set TB[64] position in (known and arrange by ascending order): TB[i]＜=Smax1＜=TB[i+1], TB[j]＜=Smax2＜=TB[j+1].Calculate TB[i], TB[j] corresponding code rate λ
TBi, λ
TBj, judge whether it belongs to the interval I of code check in the step 402
λIf, not at the interval I of code check
λIn, then return step 402, the search in the step 402 is from I at this moment
λBeginning; If at the interval I of code check
λIn, then under two kinds of modulation systems, the transformat of the maximum of support is respectively: TB[i] (QPSK) and TB[j] (16QAM).
Step S32:(1) if i〉j, modulation system adopts the QPSK mode, final transformat is TB[i]; (2) if i＜j then adopts the 16QAM modulation system, final transformat is TB[j];
(3) if i equate with j, then according to λ
TBi, λ
TBjWith they place code check area I
λIn power rate curve relation calculate their required through-put power β i, β j respectively: if β i〉β j, modulation system adopts 16QAM; If β is i＜β j, and modulation system adopts QPSK; If β i equates with β j, then adopt the QPSK mode to modulate; Final transformat is TB[i]=TB[j].
Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. a transfer format selecting method that strengthens dedicated channel E-DCH is characterized in that, comprises the steps:
A, according to the power of radio resource control RRC layer configuration, reference point set and maximum, the minimum code rate of code check, determine the interval linear equation with the power corresponding relation of every section available code check;
B, receive the physical resource of network allocation after, determine the maximum transmitted bit number that the media access control MAC layer is supported according to described physical resource and linear equation;
C, according to described maximum transmitted bit number, the maximum transport format of from transport format table, selecting the MAC layer to support;
Wherein, step B specifically comprises:
B1, calculate the maximum power that is used to strengthen uplink physical channel E-PUCH secured transmission of payload data, determine the maximum transmitted code check according to described maximum power and described linear equation according to the power resource of network allocation;
B2, determine the significant bit number that E-PUCH can carry according to the time interval resource and the code channel resource of network allocation;
B3, the significant bit number that described maximum transmitted code check and E-PUCH can be carried multiply each other, and obtain the maximum transmitted bit number that the MAC layer is supported.
2. the method for claim 1 is characterized in that:
Among the step B1, calculate the maximum power β of E-PUCH secured transmission of payload data according to following formula
0e: P
E-PUCH=P
E-base+ L+ β
e, β
e=β
0e+ α
e+ Δ
Harq, wherein, P
E-PUCHBe the maximum power resource of network allocation, L is a path loss, P
E-baseBe closed-loop power control performance number, Δ
HarqFor mixing automatic repeat requests HARQ power excursion, α
eCompensation for spreading factor.
3. the method for claim 1 is characterized in that:
Among the step B2, described significant bit number is meant and does not comprise the bit number that strengthens ascending control channel E-UCCH data.
4. the method for claim 1 is characterized in that, step C specifically comprises:
Determine the position of described maximum transmitted bit number in transport format table with dichotomy, from described transformat, select to be no more than the maximum transport format of described maximum transmitted bit number.
5. the method for claim 1 is characterized in that:
In the steps A, power when being respectively QPSK, 16QAM according to the modulation system of rrc layer configuration, reference point set and maximum, the minimum code rate of code check are determined when modulation system is QPSK, 16QAM the interval linear equation with the power corresponding relation of every section available code check respectively;
Among the step B, receive the physical resource of network allocation after, according to described physical resource and linear equation, determine the maximum transmitted bit number S1 that MAC layer when modulation system is QPSK is supported, and the modulation system maximum transmitted bit number S2 that the MAC layer is supported when being 16QAM;
Step C specifically comprises:
C1, from transport format table, select to be no more than the maximum transport format F1 of S1;
C2, from transport format table, select to be no more than the maximum transport format F2 of S2;
C3, select the greater among F1, the F2, and the modulation system of selecting described the greater correspondence is as final modulation system as final transformat.
6. method as claimed in claim 5 is characterized in that:
Among the step C3, if the equal and opposite in direction of F1, F2, then further calculate the through-put power that F1, F2 need respectively, select required through-put power smaller, and the modulation system of selecting required through-put power smaller's correspondence is as final modulation system as final transformat.
7. method as claimed in claim 6 is characterized in that:
Among the step C3, if calculate the through-put power equal and opposite in direction that F1, F2 need respectively, then selecting F1 is final transformat, and selects QPSK as final modulation system.
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| CN101986755B (en) * | 2010-10-22 | 2013-03-13 | 意法·爱立信半导体（北京）有限公司 | Method for selecting transmission format of enhanced dedicated channel and terminal |
| US10389491B2 (en) * | 2015-02-09 | 2019-08-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Implementation of HARQ on PUSCH for multiple carriers |
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| CN1867171A (en) * | 2005-11-17 | 2006-11-22 | 华为技术有限公司 | Method for improving dedicated channel wireless resource utilization ratio |
| CN101065984A (en) * | 2004-05-04 | 2007-10-31 | Lg电子株式会社 | Method of scheduling for enhanced dedicated channel (e-dch) |
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| CN101065984A (en) * | 2004-05-04 | 2007-10-31 | Lg电子株式会社 | Method of scheduling for enhanced dedicated channel (e-dch) |
| CN1867171A (en) * | 2005-11-17 | 2006-11-22 | 华为技术有限公司 | Method for improving dedicated channel wireless resource utilization ratio |
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