CN101835210A - Method and device for improving performance of high-speed uplink packet access network - Google Patents
Method and device for improving performance of high-speed uplink packet access network Download PDFInfo
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- CN101835210A CN101835210A CN201010126071A CN201010126071A CN101835210A CN 101835210 A CN101835210 A CN 101835210A CN 201010126071 A CN201010126071 A CN 201010126071A CN 201010126071 A CN201010126071 A CN 201010126071A CN 101835210 A CN101835210 A CN 101835210A
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Abstract
The invention discloses a method for improving performance of a high-speed uplink packet access (HSUPA) network. The method comprises the following steps of: setting a cell required load mark; and determining that the demodulation bit error rate of a mobile terminal reaches a preset threshold value through HSUPA, and reducing the authorization of the mobile terminal when the cell required load mark is set. The invention also discloses a device for improving the performance of the HSUPA network at the same time. The method and the device can ensure the rate when the mobile terminal is switched under the condition of keeping the throughput of a cell, improve the performance of the HSUPA network and enhance the user experience.
Description
Technical field
The present invention relates to Wideband Code Division Multiple Access (WCDMA) (WCDMA) communications field, be meant that especially a kind of raising High Speed Uplink Packet inserts the method and the device of (HSUPA) network performance.
Background technology
HSUPA is in the WCDMA communication system, and uplink direction is at the optimization and the evolution of Packet Service, and here, described uplink direction is meant from portable terminal to the Radio Access Network direction.HSUPA has mainly adopted following technology:
One, realized fast packet scheduling technology based on NodeB.Control the transmitted data rates and the transmission time of portable terminal by the base station, the current available maximum transmission rate of portable terminal is decided according to the loading condition of sub-district, the channel quality of portable terminal and the data status of required transmission in the base station.When portable terminal wished to use higher rate sending data, portable terminal sent request signal to the base station, and whether the base station agrees mobile terminal request according to the loading condition and the scheduling strategy decision of sub-district; If the request of portable terminal is agreed in the base station, the base station will send the highest available transmission rate that signaling improves portable terminal.When portable terminal does not have data to send in a period of time, the base station will reduce the highest available transmission rate of portable terminal automatically.Because these dispatchs are directly transmission between base station and portable terminal, thus based on the fast dispatch mechanism of Node B, can make the base station control the transmission rate of each portable terminal in the sub-district flexibly apace, thus reach the effect of increase cell throughout.
Two, the short frame transmission of 2ms Transmission Time Interval (TTI) further reduces transmission delay.
Three, physical layer is mixed (L1 HARQ) technology of re-transmission, and packet retransmits and directly carries out between portable terminal and base station.After the packet of portable terminal transmission is received in the base station, can send the ACK/NACK signaling to portable terminal, if the packet that receives correctly then send ack signal, if the packet error that receives just sends the NACK signal, portable terminal can resend the packet of error of transmission rapidly by the indication of ACK/NACK.
Physical layer at HSUPA is mixed in the retransmission mechanism, has also used soft merging (soft combing) and incremental redundancy technology (Incremental Redundancy) technology, has improved the transmission accuracy of retransmission data packet may.
Four, soft hand-off.When portable terminal was in the switch area, portable terminal can be selected to be connected with two or more sub-districts simultaneously according to the thresholding of prior setting and the pilot frequency intensity of different districts etc., sets up Radio Link.Like this, handoff procedure is also changed into travelling carriage and at first is connected simultaneously with the sub-district that promptly will switch to original sub-district, in continuing the process that moves, after the level of original sub-district is lower than certain thresholding, discharges again and being connected of former Serving cell, and only be connected with the sub-district that is about to enter, this process is called soft switch, soft switch reduces the transmitting power of subscriber equipment (UE), has guaranteed the continuity of message transmission in the exchange process simultaneously, has reduced probability of call.
But, in wireless environment, following problem often occurs: portable terminal is in soft changing state, when all keeping being connected with the multi wireless links that belongs to different N odeB, as shown in Figure 1, for portable terminal provides the Serving cell link condition of service relatively poor, even might can not resolve upward signal fully, and non-service cell link quality of uplink signal is fine, this moment, the HSUPA scheduler of Serving cell can't determine that portable terminal sends the speed that data need, and described HSUPA scheduler is used to control the upstream rate of portable terminal; If keep the current speed of portable terminal, then can reduce the throughput of sub-district greatly, if do not keep current speed, speed reduces in the time of then can causing portable terminal to switch, and influences user's impression, reduces the network performance of HSUPA.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and device of the HSUPA of raising network performance, can guarantee the speed when portable terminal switches under the situation that does not reduce cell throughout, improves the performance of HSUPA network, strengthens user's impression.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of method of the HSUPA of raising network performance, comprise that the sub-district is set needs the load sign, also comprises:
HSUPA determines that the demodulation bit error rate of portable terminal reaches predetermined threshold value, and the sub-district reduces the mandate of described portable terminal when needing the load sign to be set.
In the such scheme, the demodulation bit error rate of described definite portable terminal reaches threshold value and comprises: the result of each demodulation upward signal in record a period of time, the number of times of demodulation failure and total demodulation number of times are compared, and obtain demodulation bit error rate; Afterwards with the demodulation bit error rate that obtains and threshold value relatively, demodulation bit error rate is defined as demodulation bit error rate and reaches threshold value during more than or equal to threshold value.
In the such scheme, described need the load sign be set into: when the higher mandate of portable terminal needs and interface-free resources were limited, the HSUPA scheduler among the HSUPA needed the load flag set for true with this sub-district, portable terminal place.
In the such scheme, described threshold value is determined by system performance, and obtains by actual measurement.
In the such scheme, also comprise: HSUPA determine sub-district, portable terminal place need the load sign not to be set the time, the current mandate that keeps this portable terminal.
The present invention also provides a kind of device of the HSUPA of raising network performance, comprising:
The HSUPA scheduler is used for reaching predetermined threshold value in the demodulation bit error rate of determining portable terminal, and the sub-district reduces the mandate of described portable terminal when needing the load sign to be set.
In the such scheme, described HSUPA scheduler further comprises: write down comparison module, memory module and module is set; Wherein, the record comparison module is used to write down the demodulation result to the portable terminal upward signal, and the number of times of demodulation failure is compared with total demodulation number of times, draws demodulation bit error rate; Read the threshold value in the memory module, and demodulation bit error rate and the threshold value that draws compared, determine whether to reach threshold value, comparative result is sent to module is set; Memory module is used to store predetermined threshold value; Module is set, is used for having the portable terminal requirement improve to authorize and interface-free resources when limited, with this sub-district, portable terminal place need the load flag set, otherwise remove this sub-district, portable terminal place need the load flag set.
In the such scheme, the described load flag set that will need is: will need the load flag set for true.
In the such scheme, the described module that is provided with is further used for the comparative result that the receiving record comparison module sends, and when the demodulation bit error rate of portable terminal reaches threshold value, reduce a mandate N step-length of portable terminal, wherein, N gets optimal value according to actual measured results.
This shows, adopt the present invention to improve the method and the device of HSUPA network performance, HSUPA scheduler load sign as required determines that reduction still keeps the mandate of portable terminal, like this, under the situation that does not reduce cell throughout, can guarantee the speed when portable terminal switches, thereby improve the performance of HSUPA network, strengthen user's impression.
Description of drawings
Fig. 1 is the view during soft handover in the prior art;
Fig. 2 realizes improving the method flow schematic diagram of HSUPA network performance for the present invention;
Fig. 3 forms schematic diagram for the present invention realizes the device that improves the HSUPA network performance;
Fig. 4 a, 4b are for using the present invention front and back effect comparison schematic diagram.
Embodiment
Basic thought of the present invention is: after HSUPA determines that the portable terminal uplink demodulation error rate reaches the threshold value that presets, if the load sign that needs of sub-district is set, then reduce the mandate of described portable terminal.
Here, described threshold value represents that with M% the value condition is determined by system performance, obtains by actual measurement, and general span is 50%～100%;
Describedly need load to be masked as flag bit, be arranged in the HSUPA scheduler, be used to represent the state that portable terminal that current area is served need be authorized, there is a needs load sign each sub-district.Generally, need authorize and interface-free resources when limited, need the load sign can be set to very as portable terminal.Concrete, need higher mandate as portable terminal, and interface-free resources is limited, this moment, the HSUPA scheduler was changed to the load sign that needs of sub-district very, and wherein, described interface-free resources is limited to be meant entrained interference-limited of portable terminal upward signal.
Wherein, described threshold value and the described load sign that needs are the parameter that sets in advance.
Below by a specific embodiment method of the present invention is elaborated, as shown in Figure 1, the method that the present invention improves the HSUPA network performance may further comprise the steps:
The HSUPA scheduler can be to connecting with the sub-district and providing the portable terminal of service to carry out round-robin scheduling by HSUPA scheduler affiliated subdistrict every certain dispatching cycle; That is to say that the HSUPA scheduler can detect the current uplink demodulation error rate of portable terminal in each dispatching cycle.Wherein, the time of described dispatching cycle can set up on their own according to the disposal ability of CPU.
Failed probability when the described uplink demodulation error rate upward signal that to be the HSUPA scheduler send portable terminal is decoded, when portable terminal need change current upstream rate, send request signal to the HSUPA scheduler, the HSUPA scheduler is decoded to it, because the link condition between portable terminal and the sub-district is relatively poor, then can cause the HSUPA scheduler to request signal decoding failure, the HSUPA scheduler can write down in a period of time each time the demodulation result to the portable terminal upward signal, the number of times of demodulation failure and total demodulation number of times will be compared, can draw demodulation bit error rate, with demodulation bit error rate relatively with threshold value, demodulation bit error rate is more than or equal to threshold value and reaches threshold value, illustrate that the link signal between portable terminal and the sub-district is very poor, the HSUPA scheduler can't be known the speed that the user needs.Wherein, described a period of time is set according to the real network situation, and general value is 3s.
Among the present invention, need higher mandate as portable terminal, and interface-free resources is when limited, generally needs the load flag set for true the current area by the HSUPA scheduler, wherein, described interface-free resources is limited is meant entrained interference-limited of portable terminal upward signal.
Suppose, the present mandate (SG) of certain portable terminal is SG1, when this portable terminal needs higher mandate, just send request signal to the HSUPA scheduler, the HSUPA scheduler is predicted to this portable terminal and is distributed SG2, but the entrained interference signal of portable terminal upward signal can surpass limit value when using SG2, thinks that then interface-free resources is limited, can not distribute SG2 to portable terminal.In this case, need this sub-district, portable terminal place to need the load sign to be set to really illustrate except that the uplink demodulation error rate reaches the portable terminal of threshold value, have other portable terminal need improve mandate.
The mandate of portable terminal is reduced N step-length, promptly deduct N on original authorization, suppose that original mandate is SG1, the mandate after then reducing is SG1-N.Wherein, described N is an empirical value, and the value of N can should be used for determining that specifically get optimal value according to the actual tests measurement result, the value of General N can be 3 according to real network.
For realizing said method, the present invention also provides a kind of device of the HSUPA of raising network performance, and as shown in Figure 3, this device comprises: HSUPA scheduler 31;
HSUPA scheduler 31 is used for determining that the demodulation bit error rate of portable terminal reaches certain threshold value, and the sub-district reduces the mandate of described portable terminal when needing the load sign to be set;
Here, the probability of error code appears in the described demodulation bit error rate upward signal that to be the HSUPA scheduler send portable terminal when decoding, described demodulation bit error rate reaches certain threshold value, illustrate that the link signal between portable terminal and the sub-district is very poor, the HSUPA scheduler can't be known the speed that the user needs; The described load sign that needs is used to the state that shows that current mobile terminal need be authorized, and generally is set to very, represents to have except that described portable terminal other portable terminal to need to authorize, and described mandate is a upstream rate.
Described HSUPA scheduler 31 further comprises: write down comparison module 311, memory module 312 and module 313 is set; Wherein,
Here, described interface-free resources is limited is meant entrained interference-limited of portable terminal upward signal.
Adopt the present invention before with afterwards, the result is surveyed shown in Fig. 4 a and Fig. 4 b in outdoor field, and wherein, Fig. 4 a is for before employing the present invention, and the speed when detecting the portable terminal soft handover can find that speed descends frequently; Fig. 4 b is for after employing the present invention, and the speed when detecting the portable terminal soft handover can find that speed is steady, basic not decline.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. one kind is improved the method that High Speed Uplink Packet inserts the HSUPA network performance, it is characterized in that the sub-district is set needs the load sign, and described method also comprises:
HSUPA determines that the demodulation bit error rate of portable terminal reaches predetermined threshold value, and the sub-district reduces the mandate of described portable terminal when needing the load sign to be set.
2. method according to claim 1 is characterized in that, the demodulation bit error rate of described definite portable terminal reaches threshold value and comprises:
The result of each demodulation upward signal in record a period of time compares the number of times of demodulation failure and total demodulation number of times, obtains demodulation bit error rate; Afterwards with the demodulation bit error rate that obtains and threshold value relatively, demodulation bit error rate is defined as demodulation bit error rate and reaches threshold value during more than or equal to threshold value.
3. method according to claim 1, it is characterized in that, described need the load sign be set into: when the higher mandate of portable terminal needs and interface-free resources were limited, the HSUPA scheduler among the HSUPA needed the load flag set for true with this sub-district, portable terminal place.
4. according to claim 1,2 or 3 described methods, it is characterized in that described threshold value is determined by system performance, and obtains by actual measurement.
5. method according to claim 1 is characterized in that, this method also comprises: HSUPA determine sub-district, portable terminal place need the load sign not to be set the time, the current mandate that keeps this portable terminal.
6. a device that improves the HSUPA network performance is characterized in that, this device comprises:
The HSUPA scheduler is used for reaching predetermined threshold value in the demodulation bit error rate of determining portable terminal, and the sub-district reduces the mandate of described portable terminal when needing the load sign to be set.
7. device according to claim 6 is characterized in that, described HSUPA scheduler further comprises: write down comparison module, memory module and module is set; Wherein,
The record comparison module is used to write down the demodulation result to the portable terminal upward signal, and the number of times of demodulation failure is compared with total demodulation number of times, draws demodulation bit error rate; Read the threshold value in the memory module, and demodulation bit error rate and the threshold value that draws compared, determine whether to reach threshold value, comparative result is sent to module is set;
Memory module is used to store predetermined threshold value;
Module is set, is used for having the portable terminal requirement improve to authorize and interface-free resources when limited, with this sub-district, portable terminal place need the load flag set, otherwise remove this sub-district, portable terminal place need the load flag set.
8. according to claim 6 or 7 described devices, it is characterized in that the described load flag set that will need is: will need the load flag set for true.
9. device according to claim 8, it is characterized in that, the described module that is provided with, be further used for the comparative result that the receiving record comparison module sends, and when the demodulation bit error rate of portable terminal reaches threshold value, reduce a mandate N step-length of portable terminal, wherein, N gets optimal value according to actual measured results.
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Citations (3)
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| WO2009028877A2 (en) * | 2007-08-28 | 2009-03-05 | Samsung Electronics Co., Ltd. | Scheduling method and apparatus for high speed video stream service in communication system |
| CN101483869A (en) * | 2009-01-23 | 2009-07-15 | 深圳华为通信技术有限公司 | Resource scheduling processing method and apparatus |
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|---|---|---|---|---|
| WO2009028877A2 (en) * | 2007-08-28 | 2009-03-05 | Samsung Electronics Co., Ltd. | Scheduling method and apparatus for high speed video stream service in communication system |
| CN101299887A (en) * | 2008-06-19 | 2008-11-05 | 中兴通讯股份有限公司 | Method for scheduling customer equipment load |
| CN101483869A (en) * | 2009-01-23 | 2009-07-15 | 深圳华为通信技术有限公司 | Resource scheduling processing method and apparatus |
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Application publication date: 20100915 |