CN103312465A - Method and radio network controller (RNC) for determining cycle of terminal feedback channel quality indication (CQI) - Google Patents
Method and radio network controller (RNC) for determining cycle of terminal feedback channel quality indication (CQI) Download PDFInfo
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Abstract
The invention provides a method for determining the cycle of terminal feedback channel quality indication (CQI) and a radio network controller (RNC), wherein the method comprises the following steps that the RNC determines the cycle of the terminal feedback CQI according to an uplink load; the cycle increases as the uplink load increases; and the RNC informs a terminal of the determined CQI feedback cycle. According to the method and the RNC for determining the cycle of terminal feedback (CQI), the channel quality indication feedback cycle is determined more accurately.
Description
Technical field
The present invention relates to the channel quality indication feedback field, relate in particular to method and the RNC in a kind of definite terminal feedback channel quality indication cycle.
Background technology
High speed downlink packet access (HSDPA, High Speed Downlink Packages Access) technology is to realize improving Wideband Code Division Multiple Access (WCDMA) (Wide Code Division Multiple Access, WCDMA) the of paramount importance technology of network high-speed downlink message transmission rate, that 3GPP puts forward in order to satisfy the asymmetric demand of up-downgoing data service in the R5 agreement, it can be on the basis that does not change the WCDMA system network architecture of having built, greatly improve user's downstream data traffic speed, this technology is to improve a kind of important technology of downlink capacity and data service rate in the WCDMA networking.
In HSDPA, in order to realize larger handling capacity on the interface aloft, the function of base transceiver station (NodeB) is strengthened, introduced the concept of physical layer retransmission and fast resource schedule in the NodeB aspect.By introducing these functions of originally only having wireless network control center (RNC) just to have at the Node of more close air interface B, the efficient of having accelerated re-transmission and air resource being dispatched.Simultaneously, combining with adaptive modulation encoding (Adaptive Modulation and Coding, AMC), the new technology such as mixed automatic retransfer HARQ (Hybrid Automatic Repeat Request), adopted shorter Transmission Time Interval (Transmit Time Interval, TTI) length (2ms), the fixedly many code channels transmission of spreading factor, thus realized packet data transmission ability far above the high speed of R99 at down direction.
In order to realize the functional characteristic of HSDPA, three kinds of new physical channels in physical layer specification, have been introduced, as shown in Figure 1.
(1) high-speed downlink shared channel HS-DSCH: on down link, the business datum of transmission user.Adopt fixing spreading factor SF=16, owing to need to reserve available channel code to common signal channel, downlink high-speed shared control channel HS-SCCH and relevant dedicated channel DCH, so the maximum available channel number is 15.Transmission Time Interval is defined as 2ms, 10ms, the 20ms equal length stipulated in the R99, thereby the round-trip delay between terminal and the NodeB when greatly having shortened data re-transmission.
(2) downlink high-speed shared control channel HS-SCCH: on down link, transmit the dedicated signaling of HSDPA, such as transformat and system resource indication etc.; Adopt fixing spreading factor SF=128, each terminal can be monitored 4 HS-SCCH at most simultaneously.
(3) High-Speed Dedicated Physical Control Channel HS-DPCCH: on up link, the transmission feedback channel information (as, channel quality indicator (CQI)) and transmission block transmission confirmation (as, the ACK/NACK information that carrying HARQ process needs).User terminal obtains CQI information by measuring Primary Common Pilot Channel CPICH, and the report cycle of CQI and mapping can be defined by network.
In the TS25.331 of 3GPP, stipulated the cycle of user terminal (UE) feedback CQI.According to TS25.331 agreement regulation, wireless network side specified 0,2,4,8,10,20,40,80,160 in (unit be millisecond) to UE before beginning HSDPA communication any is as the CQI feedback cycle of UE.
Hot issue of CQI feedback cycle that how to confirm is suitable.For specifying less CQI feedback cycle, UE is conducive to improve the descending throughput of HSDPA, because the NodeB scheduler can obtain the current residing wireless environment of UE more accurately, and according to this CQI value selection data block size, code channel number, modulation system and code channel power.But less CQI feedback factor is to increase ascending load as the cost acquisition, because UE needs to feed back current channel quality to the NodeB scheduler frequently, particularly when number of users is many, if a plurality of users feed back CQI simultaneously, ascending load is may lifting very high like this, all is to disturb to other users like this.Meanwhile, NodeB also needs frequently demodulation CQI, has taken so too much NodeB demodulation resource, and UE need to measure current channel quality frequently, and this has caused the UE power consumption high, has shortened the stand-by time of UE.And be that UE specifies larger CQI feedback cycle, although be conducive to control ascending load, the current residing wireless environment of the UE that the NodeB scheduler can not obtain accurately can cause descending error code and residual error code high, affects the descending throughput of HSDPA.
In addition, existing technical scheme is in case determined the CQI feedback cycle, UE can use this CQI feedback cycle always, when ascending load is overweight, can't increase the CQI feedback cycle of UE, when ascending load is idle, can't reduce the CQI feedback cycle of UE, be unfavorable for the reasonable utilization of resource.Even if need to change the CQI feedback cycle of UE, usual thinking according to this area, the technical scheme that generally can adopt is to carry out in the process of service interaction at UE and NodeB, issue wireless link reconfigured preparation (Radio Link Reconfiguration Ready) message to NodeB respectively by RNC, issue radio bearer reprovision (Radio Bear Reconfiguration) message to UE, this frequently interacting message also may cause being in the UE call drop in the service communication, affects user's impression.The technical scheme that also has, in order to reduce the interacting message of eating dishes without rice or wine, a kind of mode of the CQI of change feedback cycle proposes to make an appointment between wireless network side and the UE, namely the CQI transmission cycle of correspondence registers respectively to the channel code that not have in the set of the channel code of HS-SCCH to use in advance, when needs change the CQI feedback cycle, wireless network side is by changing the HS-SCCH channel code, be used for notice UE and change the CQI feedback cycle, but this mode needs UE to support especially, be unsuitable for general communication scenes, be of limited application.
Summary of the invention
The invention provides method and the RNC in a kind of definite terminal feedback channel quality indication cycle, to realize determining how more exactly the technical problem in channel quality indication feedback cycle.
For solving the problems of the technologies described above, the invention provides the method in the cycle of a kind of definite terminal feedback channel quality indication (CQI), described method comprises:
The cycle of terminal feedback channel quality indication (CQI) is determined at wireless network control center (RNC) according to ascending load; This cycle increases along with the increase of ascending load;
Described RNC notifies described terminal with the CQI feedback cycle of determining.
Described method further comprises:
Described RNC determines the cycle of terminal feedback CQI according to ascending load at that time in the each access of terminal.
Described method further comprises:
If described ascending load is less than 50% the time, the cycle of the terminal feedback CQI that RNC determines is 2ms;
If described ascending load is more than or equal to 50%, and simultaneously less than 75% the time, the cycle of the terminal feedback CQI that RNC determines is 8ms;
If described ascending load is more than or equal to 75% the time, the cycle of the terminal feedback CQI that RNC determines is 20ms.
Described method also comprises:
Before described RNC determines the cycle of terminal feedback CQI according to ascending load, judge according to the dispatching priority indication (SPI) of the terminal of determining in advance the CQI feedback cycle whether this terminal is important (VIP) terminal; If this terminal is the VIP terminal, determine that the CQI feedback cycle of this terminal is its default value; If described terminal is non-VIP terminal, determine the cycle of terminal feedback CQI according to ascending load.
Described RNC is sent to described terminal with the CQI feedback cycle of determining and further comprises:
Described RNC is handed down to base station (NodeB) scheduler with the CQI feedback cycle of determining when wireless link reconfigured, when radio bearer is set up the CQI feedback cycle of determining is handed down to described terminal simultaneously.
For solving the problems of the technologies described above, the present invention also provides the wireless network control center (RNC) in the cycle of a kind of definite terminal feedback channel quality indication (CQI), described RNC comprises feedback cycle determination module and CQI feedback cycle notification module, wherein:
Described feedback cycle determination module, be used for determining according to ascending load the cycle of terminal feedback channel quality indication (CQI), this cycle increases along with the increase of ascending load, and the terminal feedback CQI cycle of determining is sent to CQI feedback cycle notification module;
Described CQI feedback cycle notification module is used for getting access to definite terminal feedback CQI week after date, notifies described terminal with described definite terminal feedback CQI cycle.
Further, described feedback cycle determination module is used for determining the cycle of terminal feedback CQI according to ascending load at that time in the each access of terminal.
Further, described feedback cycle determination module is used at ascending load less than 50% the time, and the cycle of determining terminal feedback CQI is 2ms; More than or equal to 50%, and simultaneously less than 75% the time, the cycle of determining terminal feedback CQI is 8ms at ascending load; More than or equal to 75% the time, the cycle of determining terminal feedback CQI is 20ms at ascending load.
Further, described RNC also comprises important (VIP) terminal judges module;
Described VIP terminal judges module is used for judging according to dispatching priority indication (SPI) whether the terminal of pre-definite CQI feedback cycle is important (VIP) terminal, and notifies described feedback cycle determination module with judged result;
Described feedback cycle determination module also is used for when the terminal of learning pre-definite CQI feedback cycle is the VIP terminal, determines that the cycle of this terminal feedback CQI is its default value; When the terminal of learning pre-definite CQI feedback cycle is non-VIP terminal, determine the cycle of this terminal feedback CQI according to ascending load; And the terminal feedback CQI cycle of determining is sent to CQI feedback cycle notification module.
Further, described CQI feedback cycle notification module is used for when wireless link reconfigured the CQI feedback cycle of determining being handed down to base station (NodeB) scheduler, when radio bearer is set up the CQI feedback cycle of determining is handed down to described terminal simultaneously.
Technique scheme, wireless RNC determines the cycle of terminal feedback CQI according to ascending load, so that the cycle of terminal feedback CQI and uplink load situation adapt; And technique scheme adopts RNC to determine the cycle of terminal feedback CQI in the each access of terminal, relative prior art, the CQI feedback cycle of having avoided terminal to obtain is unalterable, and terminal also avoided terminal to know its feedback CQI cycle and the terminal Special Handle of Drop Question that causes in service communication in when access with regard to cycle of knowing its feedback CQI, promoted user's impression.
Description of drawings
Fig. 1 is the method flow diagram of definite channel quality indication (CQI) feedback cycle of the present embodiment;
Fig. 2 is the method flow diagram of definite channel quality indication (CQI) feedback cycle of this application example;
Fig. 3 is that the RNC of definite channel quality indication (CQI) feedback cycle of the present embodiment forms module map.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing embodiments of the invention are elaborated.Need to prove, in the situation that do not conflict, the embodiment among the application and the feature among the embodiment be combination in any mutually.
Fig. 1 is the method flow diagram of definite channel quality indication (CQI) feedback cycle of the present embodiment.
The cycle of terminal feedback channel quality indication (CQI) is determined at S101 wireless network control center (RNC) according to ascending load, this cycle increases along with the increase of ascending load;
Among the step S101 when definite CQI feedback cycle with the current residing wireless environment of terminal as Consideration, can realize when ascending load is overweight, increasing the CQI feedback cycle of terminal, when ascending load is idle, reduce the CQI feedback cycle of terminal, so that feedback CQI This move can satisfy RNC to the measurement demand of current channel, cause excessive consumption can for again the demodulation resource of NodeB.
The corresponding relation in the cycle of ascending load and terminal feedback CQI can be as shown in table 1.
Table 1
Above-mentioned RNC can be in the each access of terminal, determine the cycle of terminal feedback CQI according to ascending load at that time, to guarantee that the CQI feedback cycle that terminal gets access to is not unalterable, relative prior art, the CQI of terminal feedback has not only reflected actual channel circumstance more realistically, and terminal avoided terminal to know its feedback CQI cycle and the terminal Special Handle of Drop Question that causes in service communication in when access with regard to cycle of knowing its feedback CQI, promoted user's impression.
Above-mentioned RNC also can before determining the cycle of terminal feedback CQI according to ascending load, judge according to the dispatching priority indication (SPI) of this terminal whether described terminal is important (VIP) terminal, and wherein the span of SPI is [0,15]; If described terminal is the VIP terminal, determine that then the CQI feedback cycle of this terminal is its default value; If described terminal is non-VIP terminal, the cycle of then continuing to determine according to ascending load terminal feedback CQI.Like this, guaranteeing that feedback CQI can not make the cumbrous while to Internet resources, has also guaranteed VIP user's impression.
This RNC of S102 notifies described terminal with the CQI feedback cycle of determining;
RNC can be by being handed down to base station (NodeB) scheduler with the CQI feedback cycle of determining when wireless link reconfigured, when radio bearer is set up, the CQI feedback cycle of determining is handed down to described terminal simultaneously, this CQI feedback cycle Notification Method does not need terminal to support especially, be suitable for general communication scenes, applied range.
Fig. 2 is the method flow diagram of definite channel quality indication (CQI) feedback cycle of this application example.
S201 passes through the uplink common channel access of radio network in terminal, after authentication, safe mode, core net (CN) issues RAB (RAB) to RNC and assigns (RAB ASSIGNMENT REQUEST) message, the transport-type of carried terminal (Traffic Class in this message, TC), transmission process priority (Traffic Handling Priority, THP), distribute/keep priority (Allocation/Retention Priority, ARP);
After S202:RNC receives the RAB assignment messages, according to the TC that carries in the message, THP and ARP, find the SPI of this terminal by certain mapping relations;
S203:RNC judges according to SPI whether this terminal is VIP user, is VIP user if SPI, illustrates this terminal more than or equal to 14, execution in step S208, otherwise execution in step S204;
S204:RNC determines the CQI feedback cycle of terminal according to uplink load situation, when RNC judges current ascending load less than 50%, execution in step S205; When RNC judges current ascending load more than or equal to 50%, and less than 75%, execution in step S206; When RNC judges current ascending load more than or equal to 75%, execution in step S207;
Normal conditions during up zero load, with reference to receiving total bandwidth (Refer Receive total wide band power) are-106dBm.
S205: when RNC judges that current ascending load is less than 50%, lifting is made an uproar less than 3dB in end this moment, when being up RTWP (accepting total bandwidth Receive total wide band power) less than-103dBm, the CQI feedback cycle of determining terminal is 2ms, execution in step S209;
S206: when RNC judges current ascending load more than or equal to 50%, and less than 75%, namely up RTWP is more than or equal to-103dBm, and during less than-100dBm, the CQI feedback cycle of determining terminal is 8ms, execution in step S209;
S207: when RNC judges current ascending load more than or equal to 75%, when namely up RTWP was more than or equal to-100dBm, the CQI feedback cycle of determining terminal was 20ms, execution in step S209;
S208:RNC determines that the CQI feedback cycle of this terminal is its default value, such as 2ms;
S209:RNC is handed down to the NodeB scheduler with the CQI feedback cycle of determining when wireless link reconfigured, (Radio Bear Setup) is handed down to terminal with the CQI feedback cycle of determining when radio bearer is set up simultaneously;
S210: terminal is regularly fed back CQI to the NodeB scheduler according to the CQI feedback cycle that receives.
Fig. 3 is that the RNC of definite channel quality indication (CQI) feedback cycle of the present embodiment forms module map.
This RNC comprises feedback cycle determination module and CQI feedback cycle notification module, wherein,
The feedback cycle determination module, for the cycle of determining terminal feedback channel quality indication (CQI) according to ascending load, this cycle increases along with the increase of ascending load, and the terminal feedback CQI cycle of determining is sent to CQI feedback cycle notification module; As, less than 50% the time, the cycle of determining terminal feedback CQI is 2ms at ascending load; More than or equal to 50%, and simultaneously less than 75% the time, the cycle of determining terminal feedback CQI is 8ms at ascending load; More than or equal to 75% the time, the cycle of determining terminal feedback CQI is 20ms at ascending load;
This feedback cycle determination module can in the each access of terminal, be determined the cycle of terminal feedback CQI according to ascending load at that time;
CQI feedback cycle notification module is used for getting access to definite terminal feedback CQI week after date, notifies described terminal with described definite terminal feedback CQI cycle;
Concrete notification procedure can be: CQI feedback cycle notification module gets access to definite terminal feedback CQI week after date, when wireless link reconfigured, the CQI feedback cycle of determining is handed down to base station (NodeB) scheduler, when radio bearer is set up, the CQI feedback cycle of determining is handed down to described terminal simultaneously.
Except above-mentioned module, RNC also can comprise important (VIP) terminal judges module, be used for according to dispatching priority indication (SPI) (SPI ∈ [0,15]) judge whether the terminal of determining in advance the CQI feedback cycle is important (VIP) terminal, and notify described feedback cycle determination module with judged result; As, SPI ∈ [14,15] determines that in advance the terminal of CQI feedback cycle is the VIP terminal, and SPI ∈ [0,14), determine that in advance the terminal of CQI feedback cycle is non-VIP terminal;
The feedback cycle determination module of this moment also need to when the terminal of learning pre-definite CQI feedback cycle is the VIP terminal, determine that the CQI feedback cycle of this terminal is its default value; When the terminal of learning pre-definite CQI feedback cycle is non-VIP terminal, determine the cycle of this terminal feedback CQI according to ascending load; And the terminal feedback CQI cycle of determining is sent to CQI feedback cycle notification module.
One of ordinary skill in the art will appreciate that all or part of step in the said method can come the instruction related hardware to finish by program, described program can be stored in the computer-readable recording medium, such as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits, and correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Need to prove; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. the method in the cycle of a definite terminal feedback channel quality indication (CQI) is characterized in that, described method comprises:
The cycle of terminal feedback channel quality indication (CQI) is determined at wireless network control center (RNC) according to ascending load; This cycle increases along with the increase of ascending load;
Described RNC notifies described terminal with the CQI feedback cycle of determining.
2. the method for claim 1 is characterized in that, described method further comprises,
Described RNC determines the cycle of terminal feedback CQI according to ascending load at that time in the each access of terminal.
3. such as each described method in the claim 1～2, it is characterized in that, described method further comprises:
If described ascending load is less than 50% the time, the cycle of the terminal feedback CQI that RNC determines is 2ms;
If described ascending load is more than or equal to 50%, and simultaneously less than 75% the time, the cycle of the terminal feedback CQI that RNC determines is 8ms;
If described ascending load is more than or equal to 75% the time, the cycle of the terminal feedback CQI that RNC determines is 20ms.
4. such as each described method in the claim 1～2, it is characterized in that, described method also comprises:
Before described RNC determines the cycle of terminal feedback CQI according to ascending load, judge according to the dispatching priority indication (SPI) of the terminal of determining in advance the CQI feedback cycle whether this terminal is important (VIP) terminal; If this terminal is the VIP terminal, determine that the CQI feedback cycle of this terminal is its default value; If described terminal is non-VIP terminal, determine the cycle of terminal feedback CQI according to ascending load.
5. such as each described method in the claim 1～2, it is characterized in that, described RNC is sent to described terminal with the CQI feedback cycle of determining and further comprises:
Described RNC is handed down to base station (NodeB) scheduler with the CQI feedback cycle of determining when wireless link reconfigured, when radio bearer is set up the CQI feedback cycle of determining is handed down to described terminal simultaneously.
6. the wireless network control center (RNC) in the cycle of a definite terminal feedback channel quality indication (CQI) is characterized in that, described RNC comprises feedback cycle determination module and CQI feedback cycle notification module, wherein
Described feedback cycle determination module, be used for determining according to ascending load the cycle of terminal feedback channel quality indication (CQI), this cycle increases along with the increase of ascending load, and the terminal feedback CQI cycle of determining is sent to CQI feedback cycle notification module;
Described CQI feedback cycle notification module is used for getting access to definite terminal feedback CQI week after date, notifies described terminal with described definite terminal feedback CQI cycle.
7. system as claimed in claim 6 is characterized in that,
Described feedback cycle determination module is used for determining the cycle of terminal feedback CQI according to ascending load at that time in the each access of terminal.
8. such as each described system in the claim 6～7, it is characterized in that,
Described feedback cycle determination module is used at ascending load less than 50% the time, and the cycle of determining terminal feedback CQI is 2ms; More than or equal to 50%, and simultaneously less than 75% the time, the cycle of determining terminal feedback CQI is 8ms at ascending load; More than or equal to 75% the time, the cycle of determining terminal feedback CQI is 20ms at ascending load.
9. such as each described system in the claim 6～7, it is characterized in that,
Described RNC also comprises important (VIP) terminal judges module;
Described VIP terminal judges module is used for judging according to dispatching priority indication (SPI) whether the terminal of pre-definite CQI feedback cycle is important (VIP) terminal, and notifies described feedback cycle determination module with judged result;
Described feedback cycle determination module also is used for when the terminal of learning pre-definite CQI feedback cycle is the VIP terminal, determines that the cycle of this terminal feedback CQI is its default value; When the terminal of learning pre-definite CQI feedback cycle is non-VIP terminal, determine the cycle of this terminal feedback CQI according to ascending load; And the terminal feedback CQI cycle of determining is sent to CQI feedback cycle notification module.
10. such as each described system in the claim 6～7, it is characterized in that,
Described CQI feedback cycle notification module is used for when wireless link reconfigured the CQI feedback cycle of determining being handed down to base station (NodeB) scheduler, when radio bearer is set up the CQI feedback cycle of determining is handed down to described terminal simultaneously.
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