CN1983844A - Control for improving up-link resource utilization rate in radio telecommunication system - Google Patents

Abstract

The invention is concerned with the controlling method that can improve the bounding resource utilization efficiency in the radio communication system, it is: Node B monitoring station controller configures the shell power migration of the user's equipment, estimates the resource utilization efficiency whether or not fit for the current user's equipment, makes the decision to adjust the bounding transmission format of the user's equipment if it is not fit.

Description

Improve the control method of ascending resource utilization ratio in the wireless communication system

Technical field

The present invention relates to improve in a kind of mobile communication system the control method of ascending resource utilance, particularly be directed to the Node B scheduler of up reinforced channel (E-DCH) in the WCDMA system.

Background technology

In the HSUPA of WCDMA standard R6 (High Speed Uplink Packet Access, the high speed uplink packet inserts),, adopted Node B control scheduling strategy for scheduling of resource and dispatching algorithm faster more flexibly are provided.The scheduling that realizes in Node B belongs to distributed scheduling, and UE (UserEquipment) just can't consider the influence of other adjacent cells, and WCDMA is the self-interference system, the limited gross power situation that receives with Node B place receiver of ascending resource capacity.When cell load is elevated to a certain degree, the relation of the growth of area interference and throughput is an exponent function relation, also with regard to the time say under high load condition, increase identical system throughput, need bigger UE transmitting power under low system load state, this is very uneconomic to uplink transmission power limited users equipment UE.Therefore need very rationally to arrange local resource, maximum resource utilization ratio.

HSUPA proposes in R6, and it has used some key technologies: the dispatching technique of Node B control; HARQ (hybrid automatic repeat request mixes automatic repeat requests) technology in conjunction with soft merging; Shorter TTI (Transmission Time Interval, Transmission Time Interval) (2ms TTI).HSUPA comprises the uplink and downlink physical channel, up E-DPDCH (E-DCH Dedicatedphysical data channel) and the E-DPCCH (E-DCH Dedicated Physical ControlChannel) of comprising, the E-DPDCH transmitting grouped data, E-DPCCH transmission E-TFC control informations such as (E-DCH TransportFormat Combination); Descending E-AGCH (E-DCH Access GrantChannel), E-RGCH (E-DCH Relative Grant Channel) and the E-HICH control channels such as (E-DCH HybridARQ Indicator Channel) of comprising, E-AGCH, E-RGCH finish the data dispatch function, and E-HICH transferring ACK/NACK (affirmation/non-affirmation) signaling is finished functions of retransmission.The transmit power resource that HSUPA can make full use of UE is carried out the maximization transmission of Packet Service since up be interference-limited, if when uplink interference surpasses a thresholding, the performance of up channel will descend greatly.Surpass threshold value for fear of uplink interference, Node B need measure uplink interference, and reports RNC (Radio NetworkController, base station controller) to carry out RRM (Radio Resource Manager, radio resource manager) control.Measured value can be RTWP (Received total wideband power receives the broadband gross power) or RoT (Rise over Thermal, noise rise) in HSUPA.E-DCH (theENHANCED UPLINK Dedicated Channel) makes the scheduling ruling according to dispatch request and the current area load RoT situation of UE, and the E-TFC that influences UE by dispatch AG/RG selects, and finishes inner-loop power control.

Qos control basic thought: the DPCCH that has mentioned E-DCH in the R6 agreement assists E-DCH to carry out power control, and the control of DPCCH power is identical with R99.The main employing under the condition that has DCH to exist according to the SIRtarget of the outer shroud control DPCCH of the BLER of DCH, and guarantees the Qos of E-DCH by the power excursion of RRC reprovision E-DPDCH; Under the situation that does not need DCH (just SRB (Signalling Radio Bearer, Signaling Radio Bearer) is mapped to E-DCH), size 0 TrBlck assists to carry out the Qos control of E-DCH possibly.

The E-DCH data transmission information that RNC provides according to Node B is kept its up-to-date power offset, and may determine to transmit the power offset attribute that upgrades to UE.UE receives the power offset of RNC, with the reference power offset addition that calculates for different E-TFC before.UE just selects E-TFC then, considers the power offset of acquisition during selection, power back-off, the dump power of UE and the data total amount that will launch.UE can use the power offset values of E-TFC and selection in next TTI.

When UE used certain transformat, as long as UE power is not limited, in order to guarantee to transmit Block Error Rate (BLER), RNC will be that UE replenishes transmit power offset by external circule power control.Because the cell uplink resource is limited, the UE that can not leave constantly increases transmitting power and guarantees that certain transformat sends the BLER of data, therefore external circule power control supplemental capacity need be controlled at a certain acceptable degree, guarantees the utilization ratio of ascending resource.

Summary of the invention

The purpose that the present invention will reach is: provide a kind of being easy to realize, to the Node B scheduling mechanism of local resource high efficiency utilization.

For achieving the above object, the present invention proposes the control method that improves the ascending resource utilization ratio in a kind of wireless communication system, wherein, Node B monitoring base station controller is the exterior ring power skew of user device configuration, whether the level of resources utilization of judging current user equipment is suitable, as the improper decision that just adjusts the uplink form of subscriber equipment.

Improve the control method of ascending resource utilization ratio in the above-mentioned wireless communication system, wherein, described method comprises:

Step 1 is provided with very first time window and external circule power control interference threshold value;

Step 2, described Node B measurement and calculating described base station controller in very first time window are that the exterior ring power of user device configuration is offset the caused interference average of pairing uplink transmission power;

Step 2, judge that whether described interference average is greater than described external circule power control interference threshold value, if, then described Node B sends dispatching command and reduces the transformat grade that described support equipment uses, if not, then described Node B sends the dispatching command transformat grade that described support equipment uses that raises.

Improve the control method of ascending resource utilization ratio in the above-mentioned wireless communication system, wherein, described step 1 also comprises:

The step of RoT predetermined threshold value, RoT measurement filtering factor and second time window is set;

Improve the control method of ascending resource utilization ratio in the above-mentioned wireless communication system, wherein, also comprise before the described step 2:

Steps A, described Node B monitoring cell uplink disturbs RoT value, and is taken in described second time window interference RoT value and carries out High frequency filter;

Whether step B judges described filtered RoT value greater than described RoT predetermined threshold value, if, enter described step 2, if not, return described steps A.

Improve the control method of ascending resource utilization ratio in the above-mentioned wireless communication system, wherein, after described Node B sent dispatch, described dispatch sent subscriber equipment by down order and finishes scheduling controlling.

Improve the control method of ascending resource utilization ratio in the above-mentioned wireless communication system, wherein, described first and second time window, RoT predetermined threshold value, external circule power control interference threshold value and RoT measurement filtering factor are provided with by emulation, actual measurement and optimize.

The method that the present invention proposes is when cell load rises to a certain degree, and RNC is the power excursion of UE reprovision by monitoring, adjusts the uplink form grade of UE, has reached the purpose of adjusting the ascending resource utilance, meticulousr distribution system resource.

Description of drawings

Fig. 1 is the overview flow chart of HSUPA power control of the present invention;

Fig. 2 is a Node B scheduling controlling utilization ratio method flow diagram of the present invention.

Wherein, Reference numeral:

110 user equipment (UE)s

120 Node?B

130 base station controller RNC

Embodiment

Below in conjunction with accompanying drawing and HSUPA Node B scheduling controlling embodiment the present invention is described in further detail.

Accompanying drawing 1 has illustrated that HSUPA carries out the overview flow chart of uplink power control.In this example, E-DCH is to Node B120 in the UE110 transmission, Node B120 reports E-DCH transmission information such as PDU the number of transmissions, block error rate BLER to give RNC130, RNC130 adjusts the power offset among the HARQ Profile of UE110 then, and orders power excursion to UE110 reprovision E-DCH by sending RRC.

Node B120 monitors cell uplink RoT simultaneously, and when reaching predetermined threshold, promptly cell load has risen to a certain degree, needs meticulousr distributing system resource, enters the Node B120 scheduling adjusting stage.Node B120 is the interference that power offset that UE110 joined causes at Node B120 place according to the external circule power control of RNC130, judge whether current UE 110 level of resources utilizations are suitable, if the improper decision that just adjusts the uplink form of UE110 use, and send dispatching command at down channel, the E-TFC that influences UE110 selects, and finishes Node B120 scheduling and adjusts.

Accompanying drawing 2 has illustrated HSUPA inner loop power control method flow chart, and this figure has specifically described Node B processing procedure among Fig. 1:

Step 200 is provided with the default thresholding K1 of RoT, external circule power control interference threshold K2, RoT measurement filtering factor β and a window T.RoT presets the startup opportunity that can influence this level of resources utilization control module that is provided with of thresholding K1; Being provided with of external circule power control interference threshold K2 will influence whole system level of resources utilization control degree; RoT measures filtering factor β and period of time T 1 influences the susceptibility of system to interference variations together.Above parameter can be provided with and optimizes according to emulation and actual measurement.

Step 201, Node B120 monitoring cell uplink disturbs RoT, and the interference value of getting in the period of time T 1 carries out High frequency filter.

The computational methods of the filter value of the interference RoT in the period of time T 1 are as follows:

RoT(n)＝β×rot(n)+(1-β)×RoT(n-1)

Wherein, RoT (n) is the area interference filter value of moment n

Rot (n) is the area interference measured value of moment n

β is a filtering factor, generally gets 0.9, can be optimized by emulation.

Step 202, judge filtering after the RoT value whether greater than default thresholding K1, be then to enter 203; Otherwise return 201.

Step 203, Node B120 measures also and calculates in the period of time T 2, and RNC130 is the interference P_OLPC that power excursion part that UE110 joined causes at Node B120 receiver place.

The P_OLPC computational methods are as follows:

Method one:

$P\_\mathrm{OLRC}\left(t\right)=\frac{\underset{i=t-T}{\overset{t}{\mathrm{\Σ}}}P\_\mathrm{OLPC}\left(i\right)}{T}$

Wherein: t is the current TTI moment

T is time cycle length (a TTI number)

P_OLPC is that external circule power control is that UE joins the interference that the transmitting power of power excursion correspondence causes at Node B120 receiver place, and computational methods are as follows:

P_OLPC＝P_EDPDCH-P_ETFC

Wherein P_EDPDCH is the E-DPDCH channel received power at Node B120 receiver place, can be measured by Node B;

P_ETFC is that UE sends the reception value of current transformat power demand at Node B120 place, and its computational methods are as follows:

$P\_\mathrm{ETFC}=P\_\mathrm{DPCCH}\×{(20\×{\log }_{10}\frac{\mathrm{PO}}{10})}^2$

Wherein, PO is UE110 required power excursion when using current transformat, can calculate with the reference E-TFCs combination of current MAC-ePDU transmission block size and RNC130 dispensing Node B120.Its computational methods are seen 3GPP standard agreement＜3GPP TS 25.214 V6.6.0 (2005-06) 〉

Method two:

$P\_\mathrm{OLPC}\left(t\right)=\frac{\underset{i=t-T}{\overset{t}{\mathrm{\Σ}}}P\_\mathrm{OLPC}\left(i\right)}{T}$

Wherein: t is the current TTI moment

T is time cycle length (a TTI number)

P_OLPC (i) is constantly during i, and RNC is the reception size of the UE power power of joining at Node B receiver place, and its computational methods are as follows:

P_OLPC(i)＝PO(i)-PL(i)

Wherein, when PO (i) was moment i, RNC130 was the power offset that UE110 joins, and RNC130 has also notified Node B120 simultaneously at notice UE110;

The path loss of UE when PL (i) is moment i, its computational methods are as follows:

PL＝P_max-P_remain-P_detected

Wherein, P_max is an agreement regulation UE110 maximum transmission power

P_remain is the UE110 dump power, and UE110 reports Node B simultaneously in the transmission dispatch request

P_detected is the interference that the Node B120 receiver UE110 of place uplink transmission power causes, and is recorded by Node B120.

In addition, the computational methods of P_OLPC are not limited to above two kinds.

Step 204, Node B120 scheduler are to compare with presetting thresholding K2 with P_OLPC, judge whether greater than default thresholding K2, if greater than would enter step 205; Otherwise enter 206.

Step 205 is calculated and is reduced the transformat grade step1 that UE110 uses, and sends dispatching command to UE110.The Step1 computational methods are as follows:

step1＝s1×ΔP

In the formula: s1 can be obtained by emulation for the downward modulation coefficient;

ΔP＝P_OLPC-K2

Step 206 is calculated the transformat grade step2 that rising UE110 uses, and sends dispatching command to UE110.The Step2 computational methods are as follows:

step2＝s2×ΔP

In the formula: s2 can be obtained by emulation for raising coefficient;

Δp＝K2-P_OLPC

Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; being familiar with those of ordinary skill in the art ought can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (6)

1. improve the control method of ascending resource utilization ratio in the wireless communication system, it is characterized in that, Node B monitoring base station controller is the exterior ring power skew of user device configuration, whether the level of resources utilization of judging current user equipment is suitable, as the improper decision that just adjusts the uplink form of subscriber equipment.

2. improve the control method of ascending resource utilization ratio in the wireless communication system according to claim 1, it is characterized in that described method comprises:

Step 1 is provided with very first time window and external circule power control interference threshold value;

Step 2, described Node B measurement and calculating described base station controller in very first time window are that the exterior ring power of user device configuration is offset the caused interference average of pairing uplink transmission power;

Step 2, judge that whether described interference average is greater than described external circule power control interference threshold value, if, then described Node B sends dispatching command and reduces the transformat grade that described support equipment uses, if not, then described Node B sends the dispatching command transformat grade that described support equipment uses that raises.

3. improve the control method of ascending resource utilization ratio in the wireless communication system according to claim 2, it is characterized in that described step 1 also comprises:

The step of noise rise predetermined threshold value, noise rise measurement filtering factor and second time window is set;

4. improve the control method of ascending resource utilization ratio in the wireless communication system according to claim 3, it is characterized in that, also comprise before the described step 2:

Steps A, described Node B monitoring cell uplink interference noise lifting value, and be taken in described second time window interference noise lifting value and carry out High frequency filter;

Whether step B judges described filtered noise rise value greater than described noise rise predetermined threshold value, if, enter described step 2, if not, return described steps A.

5. improve the control method of ascending resource utilization ratio in the wireless communication system according to claim 2, it is characterized in that, after described Node B sent dispatch, described dispatch sent subscriber equipment by down order and finishes scheduling controlling.

6. improve the control method of ascending resource utilization ratio in the wireless communication system according to claim 3, it is characterized in that described first and second time window, noise rise predetermined threshold value, external circule power control interference threshold value and noise rise measurement filtering factor are provided with by emulation, actual measurement and optimize.