CN102238647A - Spreading factor allocation method - Google Patents
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- CN102238647A CN102238647A CN2010101561306A CN201010156130A CN102238647A CN 102238647 A CN102238647 A CN 102238647A CN 2010101561306 A CN2010101561306 A CN 2010101561306A CN 201010156130 A CN201010156130 A CN 201010156130A CN 102238647 A CN102238647 A CN 102238647A
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Abstract
The invention discloses a spreading factor allocation method, which comprises the following steps of: determining the power grant of user equipment (UE) according to the UE power headroom (UPH) of the UE and an inter-cell interference threshold value; for a preset value of each spreading factor (SF), determining the media access layer (MAC) layer maximum rate which can be born by an enhanced dedicated channel (E-DCH) in the preset value of the SF according to the power grant of the UE; computing the data source rate of the UE according to the total E-DCH buffer state (TEBS) of the UE and the data volume of the UE; and judging whether the data source rate is greater than a maximum value of the MAC layer maximum rate, selecting a maximum SF corresponding to the maximum value of the MAC layer maximum rate and configuring the selected maximum SF to the UE if the data source rate is greater than the maximum rate of the MAC layer maximum rate, otherwise selecting a minimum SF corresponding to the MAC layer maximum rate and configuring the selected minimum SF to the UE. By the method, the transmission rate of a user can be ensured, and the utilization rate of system resources can be increased.
Description
Technical field
The present invention relates to the resource distribution technology in the mobile communication system, particularly relate to the distribution method that a kind of high speed uplink packet inserts the spreading factor of (HSUPA).
Background technology
In the existing HSUPA dispatching method, after the mandate of subscriber equipment (UE) distribution power, need be that this UE distributes the spreading factor that is complementary with its power mandate, give this UE the resource distribution of the pairing sign indicating number of this spreading factor in the HSUPA resource pool.
At present, the method definite and spreading factor that the power mandate is mated has multiple, the simplest method is to calculate the bit number that the pairing sign indicating number of different spreading factors resource can be carried respectively under the equal-wattage mandate, and the spreading factor of the sign indicating number resource correspondence that the carrying bit number is the highest is as the allocation result of optimum.Said method can guarantee that theoretically UE obtains maximum transmission rate under identical transmitting power.But this method can not guarantee that UE makes full use of the sign indicating number resource into its distribution, causes the waste of yard resource easily, and then influences the throughput of system.
At present, do not propose a kind of distribution method of spreading factor as yet, this method can guarantee that user's transmission rate can improve resource utilization ratio again.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of distribution method of spreading factor, and this method can be guaranteed user's transmission rate, can improve resource utilization ratio again.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
A kind of distribution method of spreading factor is characterized in that, this method may further comprise the steps:
According to dump power (UPH) and the presence of intercell interference thresholding of subscriber equipment (UE), determine the power mandate of described UE;
For the default value of each spreading factor (SF),, determine under the default value of this SF, to strengthen the MAC layer maximum rate that dedicated channel (E-DCH) can be carried according to the power mandate of described UE;
According to the whole E-DCH buffer status (TEBS) of described UE and the data volume of described UE, calculate the data source speed of described UE;
Judge that whether described data source speed is greater than the maximum in the described MAC layer maximum rate, if, then select the pairing maximum SF of maximum in the described MAC layer maximum rate to dispose to described UE, otherwise, in described MAC layer maximum rate, select the SF of minimum described MAC layer maximum rate correspondence to dispose to described UE greater than described data source speed.
In sum, in the distribution method of the spreading factor that the present invention proposes, select to distribute to this UE with the pairing SF of the immediate MAC layer of data source speed maximum rate of UE.Like this, can guarantee to make it obtain the sign indicating number resource of big transmission rate for this UE distributes, can guarantee again to maximize the use, divide utilization, improve cell throughout thereby can carry out sign indicating number for other users the sign indicating number resource allocation of being saved for the sign indicating number resource of its distribution.
Description of drawings
Fig. 1 is the flow chart of the embodiment of the invention one;
Fig. 2 is the flow chart of step 102 among Fig. 1.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Core concept of the present invention is: take all factors into consideration the data source speed of UE and the MAC layer maximum rate of different SF and carry out the distribution of SF, that is, select to distribute to this UE with the pairing SF of the immediate MAC layer of data source speed maximum rate of UE.Like this, can guarantee to make it obtain the sign indicating number resource of big transmission rate for this UE distributes, can guarantee again to maximize the use, divide utilization, improve cell throughout thereby can carry out sign indicating number for other users the sign indicating number resource allocation of being saved for the sign indicating number resource of its distribution.
Fig. 1 is the flow chart of the embodiment one of spreading factor distribution method of the present invention, and as shown in Figure 1, this embodiment may further comprise the steps:
Here, can be according to Betae=min{UPH,
Calculate power mandate Betae, wherein, I
InterBe the presence of intercell interference thresholding,
Be P
E-baseRecursive average, SNPL is the SNPL recurrence value that UE reports, n is current subframe numbers; Above-mentioned concrete grammar is grasped by those skilled in the art, does not repeat them here.
The MAC layer maximum rate that E-DCH can carry when this step was used for determining to use different yards resources so that in subsequent step, selected to satisfy the sign indicating number resource of UE needs according to this MAC layer maximum rate.
Here, the default value of described SF can comprise 1,2,4,8 and 16.The sign indicating number resource that the different values of SF are different with correspondence.
Preferably, the described MAC layer maximum rate of determining that E-DCH can carry under the default value of this SF, can adopt following step to realize:
Here, determine that the concrete grammar of power resource relevant information is grasped by those skilled in the art, do not repeat them here.
Here, the transmission channel bit number that utilizes described SF to carry, i.e. the transmission channel bit number that can carry on the sign indicating number resource of SF correspondence described in the HSUPA resource pool.
This step be used to estimate UE be scheduled after with the transmission block size that adopts, promptly obtain maximum transmitted piece less than described transmission channel bit number.Here, by the transmission block size that estimation UE adopts, can more reasonably distribute spreading factor, make resource utilization higher, here in order to follow existing protocol, the transmission block size of selecting the maximum transmitted piece less than described transmission channel bit number to be adopted as the scheduling back.
Here, highest priority logical channel promptly has the highest priority logical channel of data to be transferred.If have a plurality of logic channels to have limit priority according to the existing protocol regulation, then will report the highest logic channel of buffer memory occupancy volume as highest priority logical channel.
Here, the data source speed of calculating described UE can adopt existing techniques in realizing, that is, according to the TEBS of described UE the data volume of described UE is revised, and obtains revised amount of user data Q, according to R
Data=Q/TTI can obtain the data source speed R of UE
Data
Here need to prove because in the practical application, MAC layer speed can reactive applications the speed of layer, therefore, MAC layer maximum rate among the present invention during with different SF value and the data source speed of UE compare, to judge whether to satisfy the transmission needs of UE.
MAC layer maximum rate when this step is used for according to the data source speed of UE with different SF value is UE configuration SF.Here, the district is carried out the distribution of SF in two kinds of situation.
A kind of situation is that the data source speed of UE is greater than all MAC layer maximum rates (being the situation of data source abundance), because under this situation, UE needs data quantity transmitted bigger, therefore, here will be thought of as its configuration and can make it reach peak transfer rate and the less SF of sign indicating number resource overhead, and can save a yard resource again with the needs that can satisfy the user.Because in the practical application, SF is big more, and the sign indicating number resource that takies is more little, therefore select the pairing maximum SF of maximum in the described MAC layer maximum rate to dispose here to described UE.Particularly, when the pairing SF of maximum in the described MAC layer maximum rate was unique, then maximum SF was this unique SF, and this SF is disposed to described UE, when if the pairing SF of maximum in the described MAC layer maximum rate is a plurality of, then maximum SF is wherein disposed to described UE.
The data source speed that another kind of situation is UE is not more than all MAC layer maximum rates (being the insufficient situation of data source), under this situation, the present invention will select the data source speed with UE the most approaching and dispose to UE greater than the MAC layer maximum rate of this data source speed MAC layer maximum rate as optimum, that is, that this is the optimum pairing SF of MAC layer maximum rate disposes to UE.Like this, configuration will be not limited to the highest this constraints of carrying bit number for the SF of UE among the present invention, but select the SF that exactly satisfies data source speed to be configured, and this SF is littler than the resource overhead that carries the highest SF of bit number usually, therefore can save more sign indicating number resource and carry out code division multiplexing for other UE in the sub-district, realize raising cell throughout.This shows that this step can guarantee that the speed of described UE reaches the peak transfer rate that its data volume need reach, also can guarantee to be simultaneously the highest sign indicating number resource of described UE configuration using rate.
Below by the example case study under UE data source abundance and the inadequate two kinds of situations, further technique effect of the present invention is analyzed.
1) example of data source abundance
There are 2 HSUPA users in cell edge, and user class is 6, disposes 1 HSUPA time slot.By tabling look-up as can be known:
It is 432 bits that first HSUPA user calculates the transmission block that the E-DCH of SF=1 can carry, and the transmission block that the E-DCH of SF=2 can carry is 375 bits, and the transmission block that the E-DCH of SF=4 can carry is 326 bits.
Use Traditional calculating methods, think that the speed (432/5ms) of carrying under the SF=1 situation is higher than the speed (375/5ms) of SF=2 situation and the speed (326/5ms) of SF=4 situation, so optimum SF is 1, because this time-code resource is residue not, this TTI can't dispatch second HSUPA user again.
The present invention uses MAC layer speed when comparing the speed of SF=1, SF=2 and SF=4, the maximum PDU SIZE of the MAC-d of HSUPA logic channel is configured to 336 bits usually;
During SF=1, N
MAC-d-PDU=INT ((432-12)/336)=1
During SF=2, N
MAC-d-PDU=INT ((375-12)/336)=1
During SF=4, N
MAC-d-PDU=INT ((326-12)/336)=0
MAC speed minimum during SF=4, the MAC layer speed of SF=1 and SF=2 is identical, therefore can select bigger spreading factor SF=2.
The speed of the constant explanation application layer of MAC layer speed is constant, can not influence user's business experience, because after having determined first user's sign indicating number resource, the sign indicating number resource that also has SF=2, therefore, can dispatch second user simultaneously, therefore can improve cell throughout at this TTI.
2) example of data source deficiency
There are 2 HSUPA users in the sub-district, and user class is 6, disposes 1 HSUPA time slot.At this moment, by tabling look-up as can be known:
It is 1550 bits that first HSUPA user calculates the transmission block that the E-DCH of SF=1 can carry, and the transmission block that the E-DCH of SF=2 can carry is 778 bits, and the transmission block that the E-DCH of SF=4 can carry is 482 bits.
Use Traditional calculating methods, think that the speed (1550/5ms) of carrying under the SF=1 situation is higher than the speed (778/5ms) of SF=2 situation and the speed (482/5ms) of SF=4 situation, so optimum SF is 1, because the sign indicating number resource does not remain, this TTI can't dispatch second HSUPA user.
The present invention uses MAC layer speed when comparing the speed of SF=1, SF=2 and SF=4, the maximum PDU SIZE of the MAC-d of HSUPA logic channel is configured to 336 bits usually.
During SF=1, N
MAC-d-PDU=INT ((1550-12)/336)=4, speed is 4 * 336/5ms=268k;
During SF=2, N
MAC-d-PDU=INT ((778-12)/336)=2, speed is 2 * 336/5ms=134k;
During SF=4, N
MAC-d-PDU=INT ((482-12)/336)=1, speed is 1 * 336/5ms=67k;
As seen, secondly the MAC layer speed minimum during SF=4 is SF=2, the SF=1 maximum.
If the data source speed of first user this moment is 100k, need select spreading factor according to the present invention greater than the minimum-rate correspondence of data source speed, therefore select SF=2, the code channel of remaining SF=2 can dispatch second HSUPA user.
By foregoing as can be seen, the embodiment of the invention one is carried out the branch timing of spreading factor, is optimized by group bag characteristics and UE data source speed characteristics at Mac-d PDU, can realize higher resource utilization, improves cell throughout.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the distribution method of a spreading factor is characterized in that, this method may further comprise the steps:
According to dump power (UPH) and the presence of intercell interference thresholding of subscriber equipment (UE), determine the power mandate of described UE;
For the default value of each spreading factor (SF),, determine under the default value of this SF, to strengthen the MAC layer maximum rate that dedicated channel (E-DCH) can be carried according to the power mandate of described UE;
According to the whole E-DCH buffer status (TEBS) of described UE and the data volume of described UE, calculate the data source speed of described UE;
Judge that whether described data source speed is greater than the maximum in the described MAC layer maximum rate, if, then select the pairing maximum SF of maximum in the described MAC layer maximum rate to dispose to described UE, otherwise, in described MAC layer maximum rate, select the SF of minimum described MAC layer maximum rate correspondence to dispose to described UE greater than described data source speed.
2. method according to claim 1 is characterized in that, the described MAC layer maximum rate of determining that E-DCH can carry under the default value of this SF is:
According to the power mandate of described SF and described UE, determine power resource relevant information (PRRI);
Search table according to described PRRI, obtain code rate with reference to Beta;
According to described SF, described code rate and enhancing ascending control channel (UCCH) number, obtain the transmission channel bit number that utilizes described SF to carry;
According to the ability rating of described UE and the timeslot number of HSUPA resource pool, search E-DCH transmission block table, obtain maximum transmitted piece less than described transmission channel bit number;
According to N
MAC-d-PDU=INT ((TBS-12)/SIZE
MAC-d-PDU), calculate the number N of the protocol Data Unit (PDU) of full-size MAC-d entity in the highest priority logical channel that described maximum transmitted piece can carry
MAC-d-PDU, wherein, INT () is a bracket function, SIZE
MAC-d-PDUBe that E-DCH goes up the size of the PDU of maximum MAC-d entity in the highest logic channel of carrying, TBS is the size of described maximum transmitted piece less than described transmission channel bit number;
According to R
Mac(SF)=N
MAC-d-PDU* SIZE
MAC-d-PDU/ TTI calculates the MAC layer maximum rate R that E-DCH can carry
Mac(SF), wherein, TTI is default transmission intercal.
3. method according to claim 1 is characterized in that, the default value of described SF comprises 1,2,4,8 and 16.
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| CN 201010156130 CN102238647B (en) | 2010-04-21 | 2010-04-21 | Spreading factor allocation method |
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| CN 201010156130 CN102238647B (en) | 2010-04-21 | 2010-04-21 | Spreading factor allocation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298089A (en) * | 2012-02-28 | 2013-09-11 | 鼎桥通信技术有限公司 | Method and device for optimizing HSUPA scheduling authorization |
| CN103428841A (en) * | 2013-08-08 | 2013-12-04 | 大唐移动通信设备有限公司 | Method and device for determining power authorization |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1780458A (en) * | 2004-11-24 | 2006-05-31 | 北京三星通信技术研究有限公司 | Wireless channel resource allocation based on time frequency |
| EP1947884A2 (en) * | 2007-01-22 | 2008-07-23 | Broadcom Corporation | Method and system for medium access control (MAC) rate selection |
| US7499424B2 (en) * | 2004-05-06 | 2009-03-03 | Samsung Electronics Co., Ltd. | Method and apparatus for transmitting/receiving transmission status information and buffer state information in a mobile communication system that supports uplink packet service |
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2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7499424B2 (en) * | 2004-05-06 | 2009-03-03 | Samsung Electronics Co., Ltd. | Method and apparatus for transmitting/receiving transmission status information and buffer state information in a mobile communication system that supports uplink packet service |
| CN1780458A (en) * | 2004-11-24 | 2006-05-31 | 北京三星通信技术研究有限公司 | Wireless channel resource allocation based on time frequency |
| EP1947884A2 (en) * | 2007-01-22 | 2008-07-23 | Broadcom Corporation | Method and system for medium access control (MAC) rate selection |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298089A (en) * | 2012-02-28 | 2013-09-11 | 鼎桥通信技术有限公司 | Method and device for optimizing HSUPA scheduling authorization |
| CN103298089B (en) * | 2012-02-28 | 2015-09-09 | 鼎桥通信技术有限公司 | A kind of method that HSUPA scheduling authorization is optimized and device |
| CN103428841A (en) * | 2013-08-08 | 2013-12-04 | 大唐移动通信设备有限公司 | Method and device for determining power authorization |
| CN103428841B (en) * | 2013-08-08 | 2017-02-15 | 大唐移动通信设备有限公司 | Method and device for determining power authorization |
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| CN102238647B (en) | 2013-11-06 |
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