CN100531442C - Method for enhancing wireless communication up-link service quality - Google Patents
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Abstract
本发明公开了一种HSUPA调度器获取业务QoS信息的方法，其特征在于：当RNC需要将与业务相关的QoS信息传送给Node B时，通过NBAP协议中的Delay_U信息来通知Node B的HSUPA调度器，获取业务的时延相关QoS参数，其中，所述Delay_U信息包含在NBAP协议的E-DCH逻辑信道信息和待修改E-DCH逻辑信道信息任一个信道信息中。本发明还提供一种提高无线通信上行业务质量的方法。利用本发明的方法，可以使HSUPA调度器获得关于业务时延的QoS信息，从而有效保证某种业务对SDU的传输时延的业务质量需求。
The invention discloses a method for an HSUPA scheduler to obtain service QoS information, which is characterized in that: when RNC needs to transmit service-related QoS information to Node B, the HSUPA scheduling of Node B is notified through Delay_U information in the NBAP protocol The device obtains the delay-related QoS parameters of the service, wherein the Delay_U information is included in any channel information of the E-DCH logical channel information of the NBAP protocol and the E-DCH logical channel information to be modified. The invention also provides a method for improving the quality of wireless communication uplink service. By using the method of the invention, the HSUPA scheduler can obtain the QoS information about the service delay, thereby effectively guaranteeing the service quality requirement of a certain service on the SDU transmission delay.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method that improves the wireless communication system up-link service quality.
Background technology
WCDMA (Wideband Code Division Multiple Access) system is based on the broadband cellular wireless communication system of CDMA, and the WCDMA system supports a greater variety of types of service and high data rate traffic transmittability more.HSUPA (High Speed Uplink Packet Access) is the enhancement techniques of WCDMA system to the uplink ability.The HSUPA technology has comprised shorter TTI (Transmission Time Interval), scheduler and HARQ (HybridAutomatic Retransmission reQuest) based on Node B, new transmission channel E-DCII (EnhancedDedicate Channel) has adopted these key technologies, the HSUPA system can be significantly improved on the transmission performance of uplink service than traditional WCDMA version, the increase of nearly 50%-70% on power system capacity, the minimizing of 20%-55% is arranged, 50% the increase of on the user grouping calling flow, having an appointment in the delay of end-to-end grouping bag.Use the WCDMA system of HSUPA technology, comprised CN (Core Network), RNC (Radio Network Controller), Node B and UE (User Equipment).Wherein comprised some sub-districts (Cells) among the Node B, the sub-district is to be the common radio resources of UE service in the same area in the system, in HSUPA, by the sub-district can measuring system the ascending load degree.Node B is that unit finishes with the sub-district to the scheduling of UE.In HSUPA, the function that customer service is controlled and dispatched has been placed among the Node B, by Node B regularly or the service dispatching request (Scheduling Information) that sends according to Event triggered according to the user, seizure condition (Buffer Occupancy Status) comprising the customer service buffering area, the priority level of Business Stream (Priority), the residue transmitted power of UE (Uplink Power Headroom), and according to the uplink interference of sub-district and the load disposal ability of base station, different UE is sent different authorization command (Grants), UE is according to the authorization command of Node B, in the E-TFC table (Enhanced Transport Format Combination Table) of the pre-configured UE of giving of RNC, select suitable transformat to merge (Enhanced Transport Format Combination), and use the pairing power excursion of this E-TFC (Power Offset), in a Transmission Time Interval (TTI), send and the data of authorizing corresponding size to NodeB.The functional structure of HSUPA system is with reference to figure 2.
In HSUPA, authorize and be divided into absolute grant AG (Absolute Grants) and relative authorization RG (Relative Grants), AG has specified the absolute size that allows the data volume pairing transmitting power ratio that UE can send, be also referred to as authorization of service (Serving Grants), and RG has specified and has allowed the relative size that UE can the transmitting power ratio, this relative size is to express with the mode of step-length, and its value can be UP (improving the scheduling amount of a step-length), DOWN (reducing the scheduling amount of a step-length) and HOLD (keeping existing scheduling amount).
The WCDMA system is a multi-user's a cdma wireless system, because in the sub-district of WCDMA system, the time of up UE emission is asynchronous, caused the nonorthogonality of up send channel between the different UEs, also just caused up the interfering with each other of transmitting of different UEs, therefore exist up UE send channel number many more in the sub-district, or the transmitting power of UE big more (SG is big more), the uplink interference of system is just big more, and this annoyance level is represented with RTWP (Received Total Wideband Power).The operation of WCDMA system must remain on up interference within the rational thresholding, otherwise system will collapse because of the power ramp of disturbing overload to cause or serious problems such as a large amount of UE call drops.
When guaranteeing that the system uplink load is no more than thresholding, also need to reach this type of professional qos requirement (Qualityof Service) with certain business that guarantees UE for each UE distributes suitable wireless transmission resources.In the standard that WCDMA normal structure 3GPP (3rd Generation PartnershipProject) formulates, professional QoS can represent by MBR (Maximum Bit Rate), GBR (Guaranteed Bit Rate), parameters such as Transfer Delay, Traffic Handling Priority, and when business is initiated, dispose to RNC by CN.
The HSUPA scheduler has been controlled data transmission rate and the transmitting power of each UE in the sub-district by AG and RG just, guarantees that the uplink interference of the sub-district that these UE loads produce can not surpass interference threshold.Simultaneously according to the actual conditions of UE, dynamically determine and data transmission rate and the transmitting power (being SG) of bringing in constant renewal in each UE guarantees that each UE goes up the QoS of bearer service the transfer of data demand.
In the standard of present 3GPP (25.413), the QoS information of business need is configured among the RNC by CN, and HSUPA guarantees that the work of QoS of survice finally need be realized by the scheduling feature that is positioned on the Node B.At present RNC is by the NBAP signaling (Node B Application Part) of Iub (the Interface between RNC and Node B): RADIO LINK RECONFIGURATIONPREPARE/RADIO LINK RECONFIGURATION REQUEST/RADIO LINK SETUPREQUEST/RADIO LINK ADDITION has passed to the HSUPA scheduler that is positioned at Node B with the QoS information (comprising processing priority, MBR, GBR) of partial service, and these information do not comprise an important information of QoS of survice: Transfer Delay.The packet SDU (Service Data Unit) that Transfer Delay has defined a business is transferred to the time delay that arrives between the purpose from request.This parameter has been reacted the requirement of certain business to the propagation delay time of SDU, and this is an important indicator that influences QoS of survice.
Therefore according to the definition of present 3GPP standard, the HSUPA scheduler can't obtain the QoS information about service delay, and this will cause the HSUPA scheduling can't effectively guarantee the quality of service requirements of certain business to the propagation delay time of SDU.
Summary of the invention
The objective of the invention is to, a kind of method that improves the wireless communication system up-link service quality is provided, can make the QoS information of HSUPA scheduler acquisition, thereby effectively guarantee the quality of service requirements of certain business the propagation delay time of SDU about service delay.
For solving the problems of the technologies described above, the invention provides the method that a kind of HSUPA scheduler obtains QoS of survice information, it is characterized in that: RNC obtains the Transfer Delay information relevant with certain professional propagation delay time, and the transmission of cable network and processing delay information D elay_B, RNC determines Delay_U information according to TransferDelay and Delay_B information; When RNC needs will the QoS information relevant with business to send Node B to, notify the HSUPA scheduler of Node B by the Delay_U information in the NBAP agreement, obtain the relevant qos parameter of professional time delay, wherein, described Delay_U information is included in the E-DCH logical channel information of NBAP agreement and waits to revise in any channel information of E-DCH logical channel information.
The present invention also provides a kind of method that improves wireless communication up-link service quality, and described method comprises:
When (1) business of UE was initiated, RNC obtained the TransferDelay information relevant with certain professional propagation delay time, and the transmission of cable network and processing delay information D elay_B;
(2) RNC determines Delay_U information according to Transfer Delay and Delay_B information;
(3) RNC passes to Node B by the business that the NBAP signaling will contain Delay_U information;
(4) the HSUPA scheduler obtains professional Delay_U, and utilizes the Delay_U calculation of parameter should distribute to the transmission rate Rate_Req of this UE when scheduling;
(5) the HSUPA scheduler sends to UE with the mandate of Rate_Req correspondence by AG or RG order.
The method according to this invention, in the described step (2), RNC utilizes following formula to determine Delay_U:
Delay_U＝Transfer Delay-Delay_B (2)
Wherein, Transfer Delay is the propagation delay time that the SDU of described business passes through in network, and Delay_B is the transmission and the processing delay of cable network.
The method according to this invention, in the described step (1), RNC is by calculating at system design stage and carrying out obtaining time delay information D elay_B after the testing authentication after realizing.
The method according to this invention, in the described step (3), RNC passes to Node B by the RADIO LINKRECONFIGURATION PREPARE/RADIO LINKRECONFIGURATION REQUEST/RADIOLINK SETUP REQUEST/RADIO LINK ADDITION message of NBAP signaling with described business.
The method according to this invention, in the described step (4), the HSUPA scheduler is to utilize following formula to calculate the transmission rate of UE:
Rate_Req＝SDBS/(Delay_U-Delay_SI) (3)
Wherein, SDBS is according to UE regularly or the size of the waiting for transmission packet of certain business in the UE buffering area that go out of the SI information calculations that reports of Event triggered; Delay_SI is that UE schedule information SI is transferred to the needed time of Node B scheduler from UE.
Relative prior art, the present invention utilizes RNC to go up the existing QoS information relevant with business, particularly relevant qos parameter with time delay, and the signaling of these parameters by Iub interface sent to the HSUPA scheduler that is positioned at Node B.Behind the complete information of HSUPA scheduler acquisition about QoS of survice, distribute the suitable scheduled transmission mandate of UE by giving, come to satisfy professional QoS needs (the particularly requirement of index such as time delay), like this, the size of data that the mandate that UE obtains just can guarantee the UE buffering area can end of transmission in Delay_U, thereby improved the assurance that scheduler requires the service delay characteristic, thereby made the service delay characteristic of UE be met.
Description of drawings
Fig. 1 is the flow chart that carries out quality of service control;
Fig. 2 is an illustrative view of functional configuration of having described the HSUPA system;
Fig. 3 has described the information flow chart between each functional module in the HSUPA system.
Embodiment
For ease of profound understanding technology contents of the present invention, the present invention is described in detail below in conjunction with drawings and the specific embodiments.
The present invention is by at the E-DCH logical channel information (E-DCH Logical Channel Infomation) of Node B applying portion (NBAP:Node B Application Part) agreement with wait to revise the new Delay_U information element (IE of introducing in the E-DCH logical channel information (E-DCH Logical Channel To Modify), Information Element), notify the HSUPA scheduler that is positioned on the Node B to obtain the relevant qos parameter of professional time delay, behind the complete information of HSUPA scheduler acquisition about QoS of survice, distribute the suitable scheduled transmission mandate of UE by giving, satisfy professional requirement, thereby improved the assurance that scheduler requires the service delay characteristic the time delay index.
Definition at the Delay_U information element that will add of NBAP agreement is as shown in table 1, and the Delay_U information element that adds in E-DCHLogical Channel Information and E-DCH Logical Channel To Modify is respectively as table 2 and table 3:
Table 1 Delay_U
| IE/Group Name | Presence | Range | IE type and reference | Semantics description |
| Delay U | ENUMERATED(20，40， 60，80，100，120，140， 160，180，200，250， 300，400，500，750， 1000，1250，1500， 1750，2000，2500， 3000，3500，4000， 4500，5000，7500，...) | Unit：ms |
Table 2 E-DCH Logical Channel Information
| IE/Group Name | Presence | Range | IE Type and Reference | Semantics Description |
| E-DCH Logical Channel Information | 1..<maxn ooflogic alchanne ls> | |||
| ＞Logical Channel ID | M | 9.2.2.18c | ||
| ＞Scheduling Priority Indicator | M | 9.2.1.53H | ||
| ＞Scheduling Information | M | 9.2.2.40A | ||
| ＞MAC-es Guaranteed Bit Rate | O | 9.2.2.20E |
| ＞Delay U | O | 9.2.x.x | ||
| ＞E-DCH DDI Value | M | 9.2.2.13Q | If more than 1 MAC-d PDU size is configured for this Logical Channel， the different sizes will use subsequent DDI values starting from this DDI value. Value“0x3F”is reserved | |
| ＞MAC-d PDU Size List | 1..＜maxn oofDDIs | |||
| ＞＞MAC-d PDU Size | M | 9.2.1.38A |
Table 3 E-DCH Logical Channel To Modify
| IE/Group Name | Presence | Range | IE Type and Reference | Semantics Description |
| E-DCH Logical Channel Information | 1..<maxn ooflogic alchanne ls> | |||
| ＞Logical Channel ID | M | 9.2.2.18c | ||
| ＞Scheduling Priority Indicator | O | 9.2.1.53H | ||
| ＞Scheduling Information | O | 9.2.2.40A | ||
| ＞MAC-es Guaranteed Bit Rate | O | 9.2.2.20E | ||
| ＞Delav U | O | 9.2.x.x | ||
| ＞E-DCH DDI Value | O | 9.2.2.13Q | If more than 1 MAC-d PDU size is configured for this Logical Channel， the different sizes will use subsequent DDI values starting from this DDI value. Value“0x3F”is reserved | |
| ＞MAC-d PDU Size List | O..＜maxn oofDDIs |
| ＞＞MAC-d PDU Size | M | 9.2.1.38A |
The present invention utilizes RNC to go up the existing Qo s information relevant with business, particularly relevant qos parameter with time delay, and the signaling of these parameters by Iub interface sent to the HSUPA scheduler that is positioned at Node B.Behind the complete information of HSUPA scheduler acquisition about QoS of survice, distribute the suitable scheduled transmission mandate of UE, satisfy the QoS needs (comprising the requirement of indexs such as MBR, GBR and time delay) of business by giving.
When the business of UE is initiated, CN disposes to relevant Transfer Delay (is unit with the millisecond) information of RNC service delay, this information specifies the propagation delay time that in network, passes through of professional SDU, this time delay has comprised the propagation delay time (Delay_U) of air interface of UE and Node B and the propagation delay time and the processing (Delay_B) of Iub interface, and these time delays satisfy following equation and concern:
Transfer Delay＝Delay_U+Delay_B (1)
Can obtain from equation (1):
Delay_U＝Transfer Delay-Delay_B (2)
Can know by equation (2), the propagation delay time Delay_U of the air interface of UE and Node B is by Transfer Delay and the common decision of Delay_B, and Delay_B is the transmission and the processing delay of cable network, and Delay_B can be by calculating at system design stage and carry out testing authentication after realizing.
Delay_U is exactly that the business of UE requires the propagation delay time requirement satisfied when wave point transmits.After RNC obtains Delay_U, just can dispose scheduler by the Iub interface signaling to NodeB.
As shown in figures 1 and 3, concrete steps of the present invention are as follows:
When the business of step 1: UE was initiated, RNC obtained the Transfer Delay information relevant with certain professional propagation delay time from CN;
Step 2: RNC obtains the transmission and the processing delay information D elay_B of cable network by calculating at system design stage and carry out testing authentication after realizing;
Step 3: calculate Delay_U according to formula (2);
Step 4: Delay_U is disposed to certain business, and RNC passes to Node B by the RADIO LINKRECONFIGURATION PREPARE/RADIO LINK RECONFIGURATION REQUEST/RADIOLINK SETUP REQUEST/RADIO LINK ADDITION message of NBAP signaling;
Step 5: the HSUPA scheduler obtains this professional Delay_U, and utilizes this calculation of parameter should distribute to the transmission rate of this UE when scheduling:
Rate_Req＝SDBS/(Delay_U-Delay_SI) (3)
Wherein SDBS (Service Data Buffer Status) is according to UE regularly or the size of the waiting for transmission packet of certain business in the UE buffering area that go out of the SI information calculations that reports of Event triggered; Delay_SI is that UE schedule information SI is transferred to the needed time of Node B scheduler from UE.
By formula (3) as can be known, if UE can obtain the authorized transmissions speed of Rate_Req, can be in Delay_U+Delay_SI be that the business data transmission of Data_Size finishes, thereby satisfy the requirement of propagation delay time Delay_U size;
The use of Delay_U includes but not limited to calculate the transmission rate that scheduler is distributed to UE, and this is a kind of using method of Delay_U.At scheduler, also can calculate the UE aspects such as urgent degree and sequencing that are scheduled with this parameter based on priority or Proportional Fair algorithm.
Step 6: scheduler sends to UE with the mandate of Rate_Req correspondence by AG or RG order.
Further specify the present invention with the embodiment that in the HSUPA system certain professional QoS is controlled below.
According to invention step 1, when UE initiated professional i, RNC at first obtained this professional propagation delay time quality requirement parameter Transfer Delay i from CN;
According to invention step 2, RNC obtains wire transmission time delay information D elay_B by calculating at system design stage and carry out testing authentication after realizing;
According to invention step 3, calculate this professional i according to formula (2) and require Delay_Ui=Transfer Delay-Delay_Bi in the propagation delay time of wave point;
According to invention step 4, RNC is by the message of NBAP signaling: RADIO LINKRECONFIGURATION PREPARE/RADIO LINK RECONFIGURATION REQUEST/RADIOLINK SETUP REQUEST/RADIO LINK ADDITION sends Delay_Ui to Node B;
According to invention step 5, utilize professional i to require in the SI information that Delay_Ui, UE report scheduling time delay D elay_SIi about this UE of size of data SDBS i of professional i to calculate and be the transmission rate of this traffic assignments: Rate_Reqi=SDBSi/ (Delay_Ui-Delay_SIi) in the propagation delay time of wave point;
According to invention step 6, the HSUPA scheduler that is positioned at Node B sends to UE with the mandate of Rate_Reqi correspondence by AG or RG order, thereby finishes transmission rate and time delay control to the UE business.
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; those of ordinary skill in the art work as 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, a kind of HSUPA scheduler obtains the method for QoS of survice information, it is characterized in that: RNC obtains the Transfer Delay information relevant with certain professional propagation delay time, and the transmission of cable network and processing delay information D elay_B, RNC determines Delay_U information according to Transfer Delay and Delay_B information; When RNC needs will the QoS information relevant with business to send Node B to, notify the HSUPA scheduler of Node B by the Delay_U information in the NBAP agreement, obtain the relevant qos parameter of professional time delay, wherein, described Delay_U information is included in the E-DCH logical channel information of NBAP agreement and waits to revise in any channel information of E-DCH logical channel information.
2, a kind of method that improves wireless communication up-link service quality, described method comprises:
When (1) business of UE was initiated, RNC obtained the TransferDelay information relevant with certain professional propagation delay time, and the transmission of cable network and processing delay information D elay_B;
(2) RNC determines Delay_U information according to Transfer Delay and Delay_B information;
(3) RNC passes to Node B by the business that the NBAP signaling will contain Delay_U information;
(4) the HSUPA scheduler obtains professional Delay_U, and utilizes the Delay_U calculation of parameter should distribute to the transmission rate Rate_Req of this UE when scheduling;
(5) the HSUPA scheduler sends to UE with the mandate of Rate_Req correspondence by AG or RG order.
3, method as claimed in claim 2 is characterized in that: in the described step (2), RNC utilizes following formula to determine Delay_U:
Delay_U＝Transfer Delay-Delay_B
Wherein, Transfer Delay is the propagation delay time that the SDU of described business passes through in network, and Delay_B is the transmission and the processing delay of cable network.
4, method as claimed in claim 2 is characterized in that: in the described step (1), RNC is by calculating at system design stage and carrying out obtaining time delay information D elay_B after the testing authentication after realizing.
5, method as claimed in claim 2, it is characterized in that: in the described step (3), RNC passes to Node B by the RADIO LINK RECONFIGURATION PREPARE/RADIO LINKRECONFIGURATION REQUEST/RADIO LINK SETUP REQUEST/RADIO LINKADDITION message of NBAP signaling with described business.
6, method as claimed in claim 2 is characterized in that: in the described step (4), the HSUPA scheduler is to utilize following formula to calculate the transmission rate of UE:
Rate_Req＝SDBS/(Delay_U-Delay_SI)
Wherein, SDBS is according to UE regularly or the size of the waiting for transmission packet of certain business in the UE buffering area that go out of the SI information calculations that reports of Event triggered; Delay_SI is that UE schedule information SI is transferred to the needed time of Node B scheduler from UE.
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